Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2018	Oct. 30, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Trading Symbol	MCC
Entity Registrant Name	MEDIACOM BROADBAND LLC
Entity Central Index Key	0001161364
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		0

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
CURRENT ASSETS
Cash	$ 12,303	$ 12,606
Accounts receivable, net of allowance for doubtful accounts of $3,603 and $3,364	42,205	71,994
Prepaid expenses and other current assets	27,845	22,881
Total current assets	82,353	107,481
Property, plant and equipment, net of accumulated depreciation of $1,725,601 and $1,663,609	842,383	825,348
Franchise rights	1,176,908	1,176,908
Goodwill	195,945	195,945
Other assets, net of accumulated amortization of $5,514 and $4,788	15,799	11,001
Total assets	2,313,388	2,316,683
CURRENT LIABILITIES
Accounts payable, accrued expenses and other current liabilities	141,119	147,739
Accounts payable-affiliates	19,735	22,154
Deferred revenue-current	22,967	41,382
Current portion of long-term debt	20,500	20,500
Total current liabilities	204,321	231,775
Long-term debt, net (less current portion)	1,226,097	1,537,080
Deferred revenue - non-current	8,254
Total liabilities	1,438,672	1,768,855
Commitments and contingencies (Note 10)
PREFERRED MEMBERS' INTEREST (Note 7)	150,000	150,000
MEMBER'S EQUITY
Capital contributions (distributions)	100,525	(98,268)
Retained earnings	624,191	496,096
Total member's equity	724,716	397,828
Total liabilities, preferred members' interest and member's equity	$ 2,313,388	$ 2,316,683

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 3,603	$ 3,364
Accumulated depreciation on property, plant and equipment	1,725,601	1,663,609
Accumulated amortization on other assets	$ 5,514	$ 4,788

Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenues	$ 276,394	$ 265,037	$ 820,827	$ 792,450
Costs and expenses:
Service costs (exclusive of depreciation and amortization)	115,781	110,885	344,090	330,877
Selling, general and administrative expenses	51,768	50,256	148,578	146,394
Management fee expense	6,325	5,650	17,675	16,315
Depreciation and amortization	36,933	37,896	110,848	112,493
Operating income	65,587	60,350	199,636	186,371
Interest expense, net	(13,039)	(17,121)	(43,509)	(52,919)
(Loss) gain on derivatives, net	(1,526)	550	(875)	1,459
Loss on early extinguishment of debt (Note 6)			(12,216)	(1,966)
Other income (expense), net	371	(262)	(211)	(976)
Net income	51,393	43,517	142,825	131,969
Dividend to preferred members (Note 7)	(4,500)	(4,500)	(13,500)	(13,500)
Net income applicable to member	$ 46,893	$ 39,017	$ 129,325	$ 118,469

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 142,825	$ 131,969
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation and amortization	110,848	112,493
Gain on derivatives, net	875	(1,459)
Loss on early extinguishment of debt	2,651	1,966
Amortization of deferred financing costs	3,227	2,837
Debt extinguishment costs	9,565
Changes in assets and liabilities:
Accounts receivable, net	(3,059)	(1,480)
Prepaid expenses and other assets	3,744	(10,760)
Accounts payable, accrued expenses and other current liabilities	(7,483)	125
Accounts payable-affiliates	(2,419)	8,035
Deferred revenue-current	132	1,547
Deferred revenue-non-current	292
Other non-current liabilities		(43)
Net cash flows provided by operating activities	261,198	245,230
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(128,571)	(141,254)
Change in accrued property, plant and equipment	2,582	2,019
Proceeds from sale of assets	898	424
Net cash flows used in investing activities	(125,091)	(138,811)
CASH FLOWS FROM FINANCING ACTIVITIES:
New borrowings of bank debt	427,125	437,538
Repayment of bank debt	(443,375)	(593,538)
Redemption of senior notes	(300,000)
Dividend payments on preferred members' interest (Note 7)	(13,500)	(13,500)
Capital contributions from parent (Note 8)	208,000	60,000
Capital distributions to parent (Note 8)	(9,300)	(5,750)
Debt extinguishment costs	(9,565)
Other financing activities	4,205	5,286
Net cash flows used in financing activities	(136,410)	(109,964)
Net change in cash	(303)	(3,545)
CASH, beginning of period	12,606	14,208
CASH, end of period	12,303	10,663
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest, net of amounts capitalized	43,312	$ 45,804
Non-cash items:
Accounts receivable/deferred revenue-reclassification	32,848
Prepaid expenses and other current assets-reclassification	7,371
Deferred revenue-current/non-current-reclassification	7,962
Accounts payable/deferred revenue current-reclassification	$ 6,507

Organization	9 Months Ended
Organization	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	1. ORGANIZATION *Basis of Preparation of Unaudited Consolidated Financial Statements* Mediacom Broadband LLC (“Mediacom Broadband,” and collectively with its subsidiaries, “we,” “our” or “us”) is a Delaware limited liability company wholly-owned by Mediacom Communications Corporation (“MCC”). MCC is involved in the acquisition and operation of cable systems serving smaller cities and towns in the United States, and its cable systems are owned and operated through our operating subsidiaries and those of Mediacom LLC, a New York limited liability company wholly-owned by MCC. As limited liability companies, we and Mediacom LLC are not subject to income taxes and, as such, are included in the consolidated federal and state income tax returns of MCC, a C corporation. Our principal operating subsidiaries conduct all of our consolidated operations and own substantially all of our consolidated assets. Our operating subsidiaries are separate and distinct legal entities and have no obligation, contingent or otherwise, to make funds available to us. We rely on our parent, MCC, for various services such as corporate and administrative support. Our financial position, results of operations and cash flows could differ from those that would have resulted had we operated autonomously or as an entity independent of MCC. See Notes 8 and 9. We have prepared these unaudited consolidated financial statements in accordance with the rules and regulations of the Securities and Exchange Commission (the “SEC”). In the opinion of management, such statements include all adjustments, consisting of normal recurring accruals and adjustments, necessary for a fair statement of our consolidated results of operations, financial position, and cash flows for the interim periods presented. The accounting policies followed during such interim periods reported are in conformity with generally accepted accounting principles in the United States of America and are consistent with those applied during annual periods. For a summary of our accounting policies and other information, refer to our Annual Report on Form 10-K for the year ended December 31, 2017. The results of operations for the interim periods are not necessarily indicative of the results that might be expected for future interim periods or for the full year ending December 31, 2018. Mediacom Broadband Corporation (“Broadband Corporation”), a Delaware corporation wholly-owned by us, co-issued, jointly and severally with us, public debt securities. Broadband Corporation has no operations, revenues or cash flows and has no assets, liabilities or stockholders’ equity on its balance sheet, other than a one-hundred dollar receivable from an affiliate and the same dollar amount of common stock. Therefore, separate financial statements have not been presented for this entity. *Reclassifications* Certain reclassifications have been made to prior year amounts to conform to the current year presentation.

Recent Accounting Pronouncements

9 Months Ended

Sep. 30, 2018

Accounting Changes and Error Corrections [Abstract]

Recent Accounting Pronouncements

2. RECENT ACCOUNTING PRONOUNCEMENTS

Accounting Pronouncements Adopted January 1, 2018

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09 (“ASU 2014-09”) – Revenue from Contracts with Customers. The new guidance has impacted the timing of the recognition of installation revenue as well as installation costs and commission expenses. Under the new guidance, these amounts have been recognized as revenue and expenses over a period of time instead of immediately, as was being done under prior practice. We adopted ASU 2014-09 as of January 1, 2018, using the modified retrospective method of adoption, with cumulative-effect adjustments consisting of: a decrease of $32.8 million to accounts receivable, an increase to prepaid expenses and other current assets of $7.2 million, an increase in other assets of $7.3 million, a decrease of accounts payable, accrued expenses and other current liabilities of $6.5 million, a decrease to deferred revenue–current of $18.5 million, an increase to deferred revenue – non-current of $8.0 million and a decrease to total shareholders’ equity of $1.3 million. Previously reported amounts were not restated as a result of this adoption method. Operating results for the nine months ended September 30, 2018 are not materially different than results that would have been reported under guidance in effect before application of ASU 2014-09. See Note 12.

In August 2016, the FASB issued ASU 2016-15 – Statement of Cash Flows – Clarification of Certain Cash Receipts and Cash Payments. (“ASU 2016-15”). Stakeholders indicated that there is diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows under Topic 230, Statement of Cash Flows, and other topics. ASU 2016-15 addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice. The amendments in ASU 2016-15 are effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years using a retrospective transition method. We adopted ASU 2016-15 as of January 1, 2018. ASU 2016-15 did not have a material impact on our financial position, operations or cash flows upon adoption.

Accounting Pronouncements with Future Adoption Dates

In February 2016, the FASB issued Accounting Standards Update No. 2016-02, Leases (“ASU 2016-02”), which requires lessees to recognize leases on-balance sheet and disclose key information about leasing arrangements. The objective of ASU 2016-02 is to address the concerns to increase the transparency around lease obligations. To address these concerns, previously unrecorded off-balance sheet obligations will now be brought more prominently to light by presenting lease liabilities on the face of the balance sheet. Accompanied by enhanced qualitative and quantitative disclosures in the notes to the financial statements, financial statement users will be able to more accurately compare information from one company to another. The new standard establishes a right-of-use model (“ROU”) that requires a lessee to recognize a ROU asset and lease liability on the balance sheet for all leases with a term longer than 12 months. Leases will be classified as finance or operating, with classification affecting the pattern and classification of expense recognition in the income statement.

We expect to adopt the new standard on its effective date, January 1, 2019, with early adoption permitted. A modified retrospective transition approach is required for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available.

While we are continuing to assess the effect of adoption, we currently believe the most significant changes relate to: the recognition of new ROU assets and lease liabilities on our balance sheet for office equipment, real estate, and other assets as determined; and to a much lesser extent, (i) the de-recognition of existing assets and liabilities for certain sale-leaseback transactions (including those arising from build-to-suit lease arrangements for which construction is complete and we are leasing the constructed asset) that currently do not qualify for sale accounting; and (ii) the de-recognition of existing assets and liabilities for certain assets under construction in build-to-suit lease arrangements that we will lease when construction is complete. We do not expect a significant change in our leasing activity between now and the time of adoption. We expect to elect many of the standard’s available practical expedients on adoption. Consequently, at adoption, we expect to:

•

Recognize additional operating liabilities with corresponding ROU assets of the same amount based on the present value of the remaining minimum rental payments under current leasing standards for existing operating leases.

•

To a lesser extent, de-recognize existing debt obligations and existing fixed assets for sale-leaseback transactions that currently do not qualify for sale accounting (where applicable). Any gains or losses associated with this change in accounting will be recognized through opening retained earnings on adoption, and we will recognize new ROU assets and lease liabilities on our balance sheet for the associated leases.

•

Also, to a lesser extent, de-recognize existing build-to-suit assets and liabilities at the later of the beginning of the earliest comparative period presented in the financial statements and the date that the lessee is determined to be the accounting owner of the asset in accordance with current lease guidance (where applicable). Any difference should be recorded as an adjustment to equity at that date.

We continue to assess all of the potential impacts that the adoption of ASU 2016-02 will have on our consolidated financial statements, including the determination of the assets within the scope of the guidance, the implementation of new accounting systems and the development of new accounting policies, procedures and internal controls associated with the adoption of the standard.

In January 2017, the FASB issued ASU 2017-04 – Intangibles – Goodwill and Other – (“ASU 2017-04”). ASU 2017-04 simplifies how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. A public business entity that is a SEC filer should adopt the amendments in this update for its annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019, with early adoption permitted. We do not expect ASU 2017-04 will have a material impact on our financial position, operations or cash flows upon adoption.

In January 2018, the FASB issued ASU 2018-01 – Leases—Land Easement Practical Expedient for Transition to Topic 842 (“ASU 2018-01”). The amendments in ASU 2018-01 permit an entity to elect an optional transition practical expedient to not evaluate under Accounting Standards Codification No. 842 – Leases (“ASC 842”) all land easements that exist or expired before the entity’s adoption of ASC 842 and that were not previously accounted for as leases under current GAAP. Once an entity adopts ASC 842, it should be applied prospectively to all new (or modified) land easements to determine whether the arrangement should be accounted for as a lease. An entity that does not elect this practical expedient should evaluate all existing or expired land easements in connection with the adoption of the new lease requirements in ASC 842 to assess whether they meet the definition of a lease. The amendments in ASU 2018-01 affect the amendments in ASU 2016-02, which are not yet effective. The effective date and transition requirements for the amendments are the same as the effective date and transition requirements in ASU 2016-02. We continue to assess ASU 2018-01 in conjunction with our adoption of ASU 2016-02, as noted above, but we expect to elect the practical expedient afforded by ASU 2018-01.

In July 2018, the FASB issued ASU 2018-11- Leases (Topic 842) – Targeted Improvements (“ASU 2018-11”). ASU 2018-11 provides specific financial reporting relief to the previously-issued ASU 2016-02 (above) and related guidance. ASU 2018-11 provides transition relief on comparative reporting at adoption which affects all entities with lease contracts that choose the additional transition method. In addition, ASU 2018-11 provides relief related to the requirements for separating components of a contract and benefits only lessors whose lease contracts qualify for the practical expedient. We believe that both items of relief in ASU 2018-11 will apply to the Company and we expect to avail ourselves of these relief provisions. The amendments in ASU 2018-11 are effective for public business entities as of January 1, 2019. We expect that ASU 2018-11 will provide efficiencies with the Company’s transition efforts at adoption.

In August 2018, the FASB issued ASU 2018-15—Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract (“ASU 2018-15”). The amendments in ASU 2018-15 align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The accounting for the service element of a hosting arrangement that is a service contract is not affected by the amendments in ASU 2018-15. We are still evaluating the impact of ASU 2018-15. The amendments in ASU 2018-15 are effective for us for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption of the amendments is permitted, including adoption in any interim period, for all entities. ASU 2018-15 can be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption.

Fair Value

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value

3. FAIR VALUE

The tables below set forth our financial assets and liabilities measured at fair value on a recurring basis using a market-based approach. Our financial assets and liabilities, all of which represent interest rate exchange agreements (which we refer to as “interest rate swaps”) have been categorized according to the three-level fair value hierarchy established by Accounting Standards Codification (“ASC”) No. 820 — Fair Value Measurement, which prioritizes the inputs used in measuring fair value, as follows (dollars in thousands):

•

Level 1 — Quoted market prices in active markets for identical assets or liabilities.

•

Level 2 — Observable market based inputs or unobservable inputs that are corroborated by market data.

•

Level 3 — Unobservable inputs that are not corroborated by market data.


	Fair Value as of September 30, 2018
	Level 1		Level 2		Level 3		Total
Assets
Interest rate exchange agreements	$	—	$	1,280	$	—	$	1,280
Liabilities
Interest rate exchange agreements	$	—	$	—	$	—	$	—

	Fair Value as of December 31, 2017
	Level 1		Level 2		Level 3		Total
Assets
Interest rate exchange agreements	$	—	$	2,154	$	—	$	2,154
Liabilities
Interest rate exchange agreements	$	—	$	—	$	—	$	—

The fair value of our interest rate swaps represents the estimated amount that we would receive or pay to terminate such agreements, taking into account projected interest rates, based on quoted London Interbank Offered Rate (“LIBOR”) futures and the remaining time to maturity. While our interest rate swaps are subject to contractual terms that provide for the net settlement of transactions with counterparties, we do not offset assets and liabilities under these agreements for financial statement presentation purposes, and assets and liabilities are reported on a gross basis.

As of September 30, 2018, we recorded a current asset of $1.3 million and no current liability, long-term asset or long-term liability. As of December 31, 2017, we recorded a current asset of $2.2 million and no current liability, long-term asset or long-term liability.

As a result of the changes in the mark-to-market valuations on our interest rate swaps, we recorded a net loss on derivatives of $1.5 million and a net gain on derivatives $0.6 million for the three months ended September 30, 2018 and 2017, respectively, and a net loss on derivatives of $0.9 million and a net gain on derivatives of $1.5 million for the nine months ended September 30, 2018 and 2017, respectively.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Property, Plant and Equipment

9 Months Ended

Sep. 30, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

4. PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment consisted of the following (dollars in thousands):


	September 30, 2018			December 31, 2017
Cable systems, equipment and customer devices	$	2,439,890		$	2,362,459
Vehicles		47,872			46,696
Buildings and leasehold improvements		38,187			37,810
Furniture, fixtures and office equipment		34,250			34,207
Land and land improvements		7,785			7,785

Property, plant and equipment, gross	$	2,567,984		$	2,488,957
Accumulated depreciation		(1,725,601	)		(1,663,609	)

Property, plant and equipment, net	$	842,383		$	825,348

Accounts Payable, Accrued Expenses and Other Current Liabilities

9 Months Ended

Sep. 30, 2018

Payables and Accruals [Abstract]

Accounts Payable, Accrued Expenses and Other Current Liabilities

5. ACCOUNTS PAYABLE, ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES

Accounts payable, accrued expenses and other current liabilities consisted of the following (dollars in thousands):


	September 30, 2018		December 31, 2017
Accrued programming costs	$	30,746	$	28,840
Accounts payable - trade		26,588		39,415
Accrued taxes and fees		17,716		16,221
Accrued payroll and benefits		15,049		13,102
Accrued property, plant and equipment		9,357		6,775
Advance customer payments		8,332		13,817
Accrued service costs		8,172		6,171
Bank overdrafts ⁽¹⁾		7,225		3,020
Accrued administrative costs		5,665		4,355
Accrued interest		5,287		7,422
Accrued marketing costs		4,834		3,528
Accrued telecommunications costs		735		816
Other accrued expenses		1,413		4,257

Accounts payable, accrued expenses and other current liabilities	$	141,119	$	147,739

(1)

Bank overdrafts represent outstanding checks in excess of funds on deposit at our disbursement accounts. We transfer funds from our depository accounts to our disbursement accounts upon daily notification of checks presented for payment. Changes in bank overdrafts are reported in “other financing activities” in our Consolidated Statements of Cash Flows.

Debt

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Debt

6. DEBT

Outstanding debt consisted of the following (dollars in thousands):


	September 30, 2018		December 31, 2017
Bank credit facility	$	1,060,750	$	1,077,000
5¹⁄₂% senior notes due 2021		200,000		200,000
6³⁄₈% senior notes due 2023		—		300,000

Total debt	$	1,260,750	$	1,577,000
Less: current portion		20,500		20,500

Total long-term debt, gross (less current portion)	$	1,240,250	$	1,556,500
Less: deferred financing costs, net		14,153		19,420

Total long-term debt, net (less current portion)	$	1,226,097	$	1,537,080

2018 Financing Activity

On March 2, 2018, we called for the irrevocable redemption of the entire $300.0 million principal amount outstanding of our 6³/₈% senior notes due April 2023 (the “6³/₈% Notes”).

On March 30, 2018, we received $158.0 million of cash contributions from our parent, MCC, which, in turn, had received such contributions from Mediacom LLC on the same date.

On April 2, 2018, we fully redeemed the 6³/₈% Notes at a redemption price of 103.188% for an aggregate redemption price of $309.6 million, which was funded with the $158.0 million cash contribution noted above, and $151.6 million of borrowings under our revolving credit commitments. As a result of the redemption of the 6³/₈% Notes, we recorded a loss on early extinguishment of debt of $12.2 million for the nine months ended September 30, 2018, which represented the $9.6 million redemption price paid above par and the write-off of $2.6 million of unamortized financing costs.

Bank Credit Facility

As of September 30, 2018, we maintained a $1.405 billion credit facility (the “credit facility”), comprising:

•

$375.0 million of revolving credit commitments, which expire on November 2, 2022;

•

$237.5 million of outstanding borrowings under Term Loan A-1, which mature on November 2, 2022;

•

$792.0 million of outstanding borrowings under Term Loan M, which mature on January 15, 2025;

As of September 30, 2018, we had approximately $334.0 million of unused revolving credit commitments, all of which were available to be borrowed and used for general corporate purposes, after giving effect to $31.3 million of outstanding loans and $9.7 million of letters of credit issued thereunder to various parties as collateral.

The credit facility is collateralized by our ownership interests in our operating subsidiaries and is guaranteed by us on a limited recourse basis to the extent of such ownership interests. As of September 30, 2018, the credit agreement governing the credit facility (the “credit agreement”) required our operating subsidiaries to maintain a total leverage ratio (as defined in the credit agreement) of no more than 5.0 to 1.0 and an interest coverage ratio (as defined in the credit agreement) of no less than 2.0 to 1.0. For all periods through September 30, 2018, our operating subsidiaries were in compliance with all covenants under the credit agreement. As of the same date, the credit agreement allowed for the full or partial repayment of any outstanding debt under the credit facility at par value any time prior to maturity.

Interest Rate Swaps

We have entered into several interest rate exchange agreements (which we refer to as “interest rate swaps”) with various banks to fix the variable rate on a portion of our borrowings under the credit facility to reduce the potential volatility in our interest expense that may result from changes in market interest rates. Our interest rate swaps have not been designated as hedges for accounting purposes, and have been accounted for on a mark-to-market basis as of, and for each of the three and nine months ended, September 30, 2018 and 2017. As of September 30, 2018, we had interest rate swaps that fixed the variable portion of $600 million of borrowings at a rate of 1.5%, all of which were scheduled to expire during December 2018.

As of September 30, 2018, the weighted average interest rate on outstanding borrowings under the credit facility, including the effect of our interest rate swaps, was 3.6%.

Senior Notes

As of September 30, 2018, we had $200 million of outstanding senior notes, all of which comprised our 5¹/₂% senior notes due April 2021 (the “5¹/₂% Notes”).

Our senior notes are unsecured obligations, and the indenture governing the 5¹/₂% Notes (the “indenture”) limits the incurrence of additional indebtedness based upon a maximum debt to operating cash flow ratio (as defined in the indenture) of 8.5 to 1.0. For all periods through September 30, 2018, we were in compliance with all covenants under the indenture. As of the same date, the indenture allowed for the full or partial repayment of any of our senior notes at any time prior to maturity, subject to certain prices and conditions specified in the indenture.

Debt Ratings

MCC’s corporate credit ratings are currently Ba2 by Moody’s and BB by Standard and Poor’s (“S&P”), both with positive outlooks, and our senior unsecured ratings are currently B1 by Moody’s and B+ by S&P, both with positive outlooks. There are no covenants, events of default, borrowing conditions or other terms in the credit agreement or indenture that are based on changes in our credit rating assigned by any rating agency.

Fair Value

The fair values of our senior notes and outstanding debt under the credit facility (which were calculated based upon unobservable inputs that are corroborated by market data that we determine to be Level 2), were as follows (dollars in thousands):


	September 30, 2018		December 31, 2017
5¹⁄₂% senior notes due 2021	$	201,750	$	203,750
6³⁄₈% senior notes due 2023		—		312,000

Total senior notes	$	201,750	$	515,750

Bank credit facility	$	1,061,740	$	1,078,995

Preferred Members' Interest	9 Months Ended
Preferred Members' Interest	Sep. 30, 2018
Equity Method Investments and Joint Ventures [Abstract]
Preferred Members' Interest	7. PREFERRED MEMBERS’ INTEREST In July 2001, we received a $150.0 million preferred membership investment (“PMI”) from the operating subsidiaries of Mediacom LLC, which has a 12% annual dividend, payable quarterly in cash. We may voluntarily repay the PMI any time at par, and the operating subsidiaries of Mediacom LLC have the option to call for the redemption of the PMI upon the repayment of all of our outstanding senior notes. We paid $4.5 million in cash dividends on the PMI during each of the three months ended September 30, 2018 and 2017, and $13.5 million in cash dividends on the PMI during each of the nine months ended September 30, 2018 and 2017.

Member's Equity	9 Months Ended
Member's Equity	Sep. 30, 2018
Equity [Abstract]
Member's Equity	8. MEMBER’S EQUITY As a wholly-owned subsidiary of MCC, our business affairs, including our financing decisions, are directed by MCC. See Note 9. Capital contributions to parent and capital distributions from parent are reported on a gross basis in the Consolidated Statements of Cash Flows. We received capital contributions from parent in cash of $208.0 million and $60.0 million during the nine months ended September 30, 2018 and 2017, respectively. We made capital distributions to parent in cash of $9.3 million and $5.8 million during the nine months ended September 30, 2018 and 2017, respectively. See Note 6.

Related Party Transactions	9 Months Ended
Related Party Transactions	Sep. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions	9. RELATED PARTY TRANSACTIONS MCC manages us pursuant to management agreements with our operating subsidiaries. Under such agreements, MCC has full and exclusive authority to manage our day-to-day operations and conduct our business. We remain responsible for all expenses and liabilities relating to the construction, development, operation, maintenance, repair and ownership of our systems. As compensation for the performance of its services, subject to certain restrictions, MCC is entitled under each management agreement to receive management fees in an amount not to exceed 4.0% of the annual gross operating revenues of our operating subsidiaries. MCC is also entitled to the reimbursement of all expenses necessarily incurred in its capacity as manager. MCC charged us management fees of $6.3 million and $5.7 million for the three months ended September 30, 2018 and 2017, respectively, and $17.7 million and $16.3 million for the nine months ended September 30, 2018 and 2017, respectively. Mediacom LLC is a preferred equity investor in us. See Note 7.

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	10. COMMITMENTS AND CONTINGENCIES *Legal Proceedings* We are involved in various legal actions arising in the ordinary course of business. In the opinion of management, the ultimate disposition of these matters is not expected to have a material adverse effect on our consolidated financial position, results of operations, cash flows or business.

Goodwill and Other Intangible Assets	9 Months Ended
Goodwill and Other Intangible Assets	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	11. GOODWILL AND OTHER INTANGIBLE ASSETS In accordance with the FASB’s ASC No. 350 — Intangibles — Goodwill and Other (“ASC 350”), the amortization of goodwill and indefinite-lived intangible assets is prohibited and requires such assets to be tested annually for impairment, or more frequently if impairment indicators arise. We have determined that our goodwill and franchise rights are indefinite-lived assets and therefore not amortizable. We last evaluated the factors surrounding our Mediacom Broadband reporting unit as of October 1, 2017 and did not believe that it was “more likely than not” that a goodwill impairment existed at that time. As such, we did not perform Step 2 of the goodwill impairment test. We last evaluated our other intangible assets as of October 1, 2017 and did not believe that it was “more likely than not” that an impairment existed at that time. Because we believe there has not been a meaningful change in the long-term fundamentals of our business during the first nine months of 2018, we determined that there has been no triggering event under ASC 350 and, as such, no interim impairment test was required for our goodwill and other intangible assets as of September 30, 2018.

Revenue Recognition

9 Months Ended

Sep. 30, 2018

Text Block [Abstract]

Revenue Recognition

12. REVENUE RECOGNITION

We adopted the new accounting guidance for revenue recognition (i.e. ASU 2014-09) as of January 1, 2018. See Note 2.

We disaggregate revenue from contracts with customers by type of services. We have determined that disaggregating revenue into these categories depicts how the nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factors in our one reporting segment.

Nature of Services

Our primary revenue stream is subscription-based and consists of video service, high-speed data service and phone service. These services have base-level offerings and can be upgraded to premium level services. Residential customers can cancel their services at any time with no penalty. Small-to-medium business customers and large enterprise-class customers (collectively, “business customers”) are generally subject to fixed-term contracts with penalties imposed for early cancellation. We recognize revenue as services are provided on a monthly basis in an amount that reflects the consideration to which we expect to be entitled in exchange for those services. Billing for all services (regardless of customer type) typically occurs in advance of services being delivered and paid by customers on a monthly basis.

We also generate revenue from installation services and customer premise equipment rental associated with our subscription-based services. After installation occurs, equipment is rented to the customer over the service period to allow the customer to use the various subscription services noted above. Fees for installation services are viewed as advance payments for future services and are recognized over the period of benefit which is estimated to be the life of the customer relationship (approximately three years for residential customers and 1-10 years for all other customers). Customer premise equipment rentals are not separate performance obligations as they are considered to be highly interdependent on the underlying video, high-speed data and/or telephone service. Revenue for equipment rental is recognized when control of the underlying services is transferred to our customers over time.

One of our other revenue streams is advertising sales. These revenues represent the insertion of commercials into various video and/or Internet platforms for an advertising customer. The performance obligation for these contracts is satisfied as the commercials are displayed. There are no agent relationships included in our delivery of our advertising services. Our obligation for returns and/or refunds is deemed insignificant. Revenue is recognized at a point in time as commercials are displayed by us and viewed by the public.

A significant portion of our revenue streams are derived from customers who may cancel their subscriptions at any time without penalty. As such, the amount of revenue related to unsatisfied, remaining performance obligations is not necessarily indicative of the future revenue to be recognized from our existing customer base. Revenue from customers with a contract containing a specified contract term and non-cancelable service period will be recognized over the term of such contracts, which is generally 1-10 years.

Franchise fees imposed by local governmental authorities are collected on a monthly basis from our customers and are periodically remitted to the local governmental authorities. Because franchise fees are our obligation, we present them on a gross basis within revenues with a corresponding operating expense. Franchise fees reported on a gross basis amounted to $5.4 million and $5.5 million for the three months ended September 30, 2018 and 2017, respectively, and $16.2 million and $16.6 million for the nine months ended September 30, 2018 and 2017, respectively.

Significant Judgments

We often provide multiple services to a customer such as: subscription services, premium video and HSD upgrades, installation services and equipment rental. These services are highly integrated within our video, HSD and phone service offerings. Judgment is required to determine whether the delivery of customer premise equipment, installation services, and additional premium services are considered distinct and should be accounted for separately from subscription services. Alternatively, the determination that these offerings are not distinct would cause these offerings to be accounted for on a combined basis within our subscription services.

Allocation of the transaction price to the distinct performance obligations in bundled service subscriptions requires judgment. The transaction price for bundled residential services is often discounted. This results in a combined, bundled price that is less than the sum of each of the individual standalone selling prices for each service. We allocate discounts for bundled residential services among each of the services to which the discount relates based on the relative standalone selling prices of those services. Standalone selling prices for our residential services are directly observable.

We believe that non-refundable upfront installation fees charged to customers result in a material right to renew the contract. As such, these upfront fees are not required to be paid upon subsequent renewals. These fees are deferred and recognized over the period of benefit which is estimated to be the life of the customer relationship (approximately three years for residential customers and 1-10 years for all other customers). Estimation of the deferral period requires consideration of both quantitative and qualitative factors.

Our revenues by type of service are as follows (dollars in thousands):


Type of service	Three Months Ended September 30, 2018		Nine Months Ended September 30, 2018
Video	$	104,679	$	320,163
Data		102,834		300,358
Phone		15,540		45,960
Business		41,951		123,786
Advertising		11,390		30,560

Total revenues	$	276,394	$	820,827

Virtually all of our revenue streams, including subscription services and equipment rental, are recognized over time. We recognize revenue at a point in time for services such as pay-per-view, video on demand, advertising and miscellaneous fees.

Contract Balances

We perform our obligations under contracts with customers by transferring services in exchange for receiving consideration from our customers. The timing of our performance often differs from the timing of the customer’s payment, which results in the recognition of a contract asset or a contract liability. We recognize a contract asset when we have the right to consideration for services transferred to a customer. Contract assets are classified as accounts receivable in our Consolidated Balance Sheets, where our right to consideration is unconditional. We recognize a contract liability for amounts paid by the customer, where we have a right to receive consideration before the transfer of services to the customer. Customers are generally billed in advance for most services we provide, resulting in a contract liability until such services are transferred to the customer. Contract liabilities are recorded as deferred revenue (current and non-current) in our Consolidated Balance Sheet.

The amount of revenue recognized during the three and nine months ended September 30, 2018 that was included in the opening contract liability balance was $1.8 million and $20.6 million, respectively.

The difference in the opening and closing balances of our receivables and contract liability primarily result from the timing difference between our performance and the customer’s payment.

There was no impairment of receivables during the nine months ended September 30, 2018.

Contract Costs

We capitalize amounts paid to obtain and fulfill a contract with a customer (e.g. sales commissions and installation activities on new contracts). We incur sales commissions in our effort to obtain customer contracts. These commissions are paid as an incentive to our employees, who are performing in a sales function, which is directly related to the contract obtained. Additionally, we incur costs to fulfill a contract through installation activities performed by its technicians. These costs include allocations of the amounts incurred for all activities associated with the installation services which are performed at a customer’s premises, such as technician’s wages and benefits, fuel costs, and vehicle maintenance.

As of September 30, 2018, the balance recognized from the costs incurred to obtain or fulfill a contract with a customer was $14.6 million of which approximately $7.1 million was short-term (recorded in prepaid and other current assets) and $7.5 million was long-term (recorded in other assets, net).

We amortize the contract assets recognized from the costs to obtain or fulfill a contract with a customer on a systematic basis, consistent with the pattern of transfer to which the services relate. For residential customers, there is no stated contract term but, in practice, is treated as a day-to-day contract that renews over time. For these residential contracts, the contract period including renewals is estimated to be our average churn rate or turnover rate, which is approximately three years. For business customers, the amortization period is the initial contract term which ranges from 1 – 10 years. The amount of amortization that we recognized in service costs for installation activities for the three and nine months ended September 30, 2018 was $0.4 million and $1.4 million, respectively. The amount of amortization that we recognized in selling, general and administrative expenses for sales commissions for the three and nine months ended September 30, 2018 was $1.6 million and $5.0 million, respectively.

Supplemental Disclosures of Cash Flow Information

Our customers are typically billed in advance for the services we provide on a monthly basis. Historically, we have recorded such amounts in both accounts receivable and deferred revenue at the time of billing. With our adoption of the new revenue recognition guidance as of January 1, 2018, we record billed amounts when we have established an unconditional right to receive payment from our customers for services to be delivered or delivered to date under the customer’s contract. Since we adopted this new guidance using the modified retrospective method, and for more information about accounts receivable, deferred revenue and other affected accounts, please refer to the non-cash items noted in the Supplemental Disclosures of Cash Flow Information section in our Consolidated Statement of Cash Flows for the nine months ended September 30, 2018. Previously reported amounts were not restated as a result of this adoption method.

Sale of Assets	9 Months Ended
Sale of Assets	Sep. 30, 2018
Discontinued Operations and Disposal Groups [Abstract]
Sale of Assets	13. SALE OF ASSETS *Tower Asset Sale* On November 15, 2017, MCC entered into an asset purchase agreement (the “APA”) to sell substantially all of its operating subsidiaries’ tower assets (the “tower assets”) to CTI Towers (“CTI”), subject to closing conditions and requirements per the APA. Such tower assets were non-strategic to MCC’s cable operations. MCC will receive equity in CTI, representing a minority position, in exchange for MCC’s tower assets. On December 21, 2017, March 15, 2018 and September 25, 2018, we contributed certain tower assets to MCC which, in turn, sold such tower assets to CTI, pursuant to the terms and conditions of the APA. The contributed tower assets had a net book value of approximately $0.1 million at the time of transfer. In conjunction, with the sale, we reduced our asset retirement obligation (liability) by approximately $1.4 million. These transactions substantially completed the tower asset sale pursuant to the terms and conditions of the APA.

Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	14. SUBSEQUENT EVENTS On October 10, 2018, Hurricane Michael made landfall in the Panhandle region of Florida. Hurricane Michael caused property damage to our cable plant, as well as to our customers’ homes and businesses, in Georgia. We are currently assessing the full impact of this storm. We have not yet determined the impact to our financial position, operations or cash flows.

Organization (Policies)	9 Months Ended
Organization (Policies)	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Preparation of Unaudited Consolidated Financial Statements	*Basis of Preparation of Unaudited Consolidated Financial Statements* Mediacom Broadband LLC (“Mediacom Broadband,” and collectively with its subsidiaries, “we,” “our” or “us”) is a Delaware limited liability company wholly-owned by Mediacom Communications Corporation (“MCC”). MCC is involved in the acquisition and operation of cable systems serving smaller cities and towns in the United States, and its cable systems are owned and operated through our operating subsidiaries and those of Mediacom LLC, a New York limited liability company wholly-owned by MCC. As limited liability companies, we and Mediacom LLC are not subject to income taxes and, as such, are included in the consolidated federal and state income tax returns of MCC, a C corporation. Our principal operating subsidiaries conduct all of our consolidated operations and own substantially all of our consolidated assets. Our operating subsidiaries are separate and distinct legal entities and have no obligation, contingent or otherwise, to make funds available to us. We rely on our parent, MCC, for various services such as corporate and administrative support. Our financial position, results of operations and cash flows could differ from those that would have resulted had we operated autonomously or as an entity independent of MCC. See Notes 8 and 9. We have prepared these unaudited consolidated financial statements in accordance with the rules and regulations of the Securities and Exchange Commission (the “SEC”). In the opinion of management, such statements include all adjustments, consisting of normal recurring accruals and adjustments, necessary for a fair statement of our consolidated results of operations, financial position, and cash flows for the interim periods presented. The accounting policies followed during such interim periods reported are in conformity with generally accepted accounting principles in the United States of America and are consistent with those applied during annual periods. For a summary of our accounting policies and other information, refer to our Annual Report on Form 10-K for the year ended December 31, 2017. The results of operations for the interim periods are not necessarily indicative of the results that might be expected for future interim periods or for the full year ending December 31, 2018. Mediacom Broadband Corporation (“Broadband Corporation”), a Delaware corporation wholly-owned by us, co-issued, jointly and severally with us, public debt securities. Broadband Corporation has no operations, revenues or cash flows and has no assets, liabilities or stockholders’ equity on its balance sheet, other than a one-hundred dollar receivable from an affiliate and the same dollar amount of common stock. Therefore, separate financial statements have not been presented for this entity.
Reclassifications	*Reclassifications* Certain reclassifications have been made to prior year amounts to conform to the current year presentation.

Fair Value (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value of Interest Rate Swap Assets and Liabilities


	Fair Value as of September 30, 2018
	Level 1		Level 2		Level 3		Total
Assets
Interest rate exchange agreements	$	—	$	1,280	$	—	$	1,280
Liabilities
Interest rate exchange agreements	$	—	$	—	$	—	$	—

	Fair Value as of December 31, 2017
	Level 1		Level 2		Level 3		Total
Assets
Interest rate exchange agreements	$	—	$	2,154	$	—	$	2,154
Liabilities
Interest rate exchange agreements	$	—	$	—	$	—	$	—

Property, Plant and Equipment (Tables)

9 Months Ended

Sep. 30, 2018

Property, Plant and Equipment [Abstract]

Components of Property, Plant and Equipment

Property, plant and equipment consisted of the following (dollars in thousands):


	September 30, 2018			December 31, 2017
Cable systems, equipment and customer devices	$	2,439,890		$	2,362,459
Vehicles		47,872			46,696
Buildings and leasehold improvements		38,187			37,810
Furniture, fixtures and office equipment		34,250			34,207
Land and land improvements		7,785			7,785

Property, plant and equipment, gross	$	2,567,984		$	2,488,957
Accumulated depreciation		(1,725,601	)		(1,663,609	)

Property, plant and equipment, net	$	842,383		$	825,348

Accounts Payable, Accrued Expenses and Other Current Liabilities (Tables)

9 Months Ended

Sep. 30, 2018

Payables and Accruals [Abstract]

Summary of Accounts Payable, Accrued Expenses and Other Current Liabilities

Accounts payable, accrued expenses and other current liabilities consisted of the following (dollars in thousands):


	September 30, 2018		December 31, 2017
Accrued programming costs	$	30,746	$	28,840
Accounts payable - trade		26,588		39,415
Accrued taxes and fees		17,716		16,221
Accrued payroll and benefits		15,049		13,102
Accrued property, plant and equipment		9,357		6,775
Advance customer payments		8,332		13,817
Accrued service costs		8,172		6,171
Bank overdrafts ⁽¹⁾		7,225		3,020
Accrued administrative costs		5,665		4,355
Accrued interest		5,287		7,422
Accrued marketing costs		4,834		3,528
Accrued telecommunications costs		735		816
Other accrued expenses		1,413		4,257

Accounts payable, accrued expenses and other current liabilities	$	141,119	$	147,739

(1)

Debt (Tables)

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Summary of Outstanding Debt

Outstanding debt consisted of the following (dollars in thousands):


	September 30, 2018		December 31, 2017
Bank credit facility	$	1,060,750	$	1,077,000
5¹⁄₂% senior notes due 2021		200,000		200,000
6³⁄₈% senior notes due 2023		—		300,000

Total debt	$	1,260,750	$	1,577,000
Less: current portion		20,500		20,500

Total long-term debt, gross (less current portion)	$	1,240,250	$	1,556,500
Less: deferred financing costs, net		14,153		19,420

Total long-term debt, net (less current portion)	$	1,226,097	$	1,537,080

Fair Values of Senior Notes and Outstanding Debt under Credit Facility


	September 30, 2018		December 31, 2017
5¹⁄₂% senior notes due 2021	$	201,750	$	203,750
6³⁄₈% senior notes due 2023		—		312,000

Total senior notes	$	201,750	$	515,750

Bank credit facility	$	1,061,740	$	1,078,995

Revenue Recognition (Tables)

9 Months Ended

Sep. 30, 2018

Text Block [Abstract]

Summary of Disaggregation of Revenue Qualitative Reconciliation

Our revenues by type of service are as follows (dollars in thousands):


Type of service	Three Months Ended September 30, 2018		Nine Months Ended September 30, 2018
Video	$	104,679	$	320,163
Data		102,834		300,358
Phone		15,540		45,960
Business		41,951		123,786
Advertising		11,390		30,560

Total revenues	$	276,394	$	820,827

Organization - Additional Information (Detail)	Sep. 30, 2018 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Amount due from affiliate by subsidiary	$ 100

- Definition

Amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership, due after 1 year (or 1 business cycle).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 4
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6918054&loc=d3e56071-112765

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(3))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(11))
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Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(3))
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Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39599-107864

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
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-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
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-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-06(3)(a)(3))
-URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e604059-122996

+ Details

Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands	Jan. 01, 2018	Sep. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Decrease to accounts receivable		$ 42,205	$ 71,994
Increase to prepaid expenses and other current assets		27,845	22,881
Increase in other assets		15,799	11,001
Decrease to deferred revenue - current		22,967	41,382
Increase to deferred revenue - non-current		8,254
Decrease to total shareholders' equity		$ 724,716	$ 397,828
Accounting Standards Update 2014-09 [Member] \| Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Finite-Lived Intangible Assets [Line Items]
Decrease to accounts receivable	$ 32,800
Increase to prepaid expenses and other current assets	7,200
Increase in other assets	7,300
Decrease of accounts payable, accrued expenses and other current liabilities	6,500
Decrease to deferred revenue - current	18,500
Increase to deferred revenue - non-current	8,000
Decrease to total shareholders' equity	$ 1,300

Fair Value - Fair Value of Interest Rate Swap Assets and Liabilities (Detail) - Interest Rate Swap [Member] - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	$ 1,280	$ 2,154
Liabilities	0	0
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	0	0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	1,280	2,154
Liabilities	0	0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	$ 0	$ 0

Fair Value - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
Fair Value - Additional Information (Detail) - USD ($)	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Current liability	$ 0		$ 0		$ 0
Long-term liability	0		0		0
Long term assets	0		0		0
Current assets	1,300,000		1,300,000		$ 2,200,000
Net gain (loss) on derivatives	$ (1,500,000)	$ 600,000	$ (900,000)	$ 1,500,000

Property, Plant and Equipment - Components of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,567,984	$ 2,488,957
Accumulated depreciation	(1,725,601)	(1,663,609)
Property, plant and equipment, net	842,383	825,348
Cable Systems, Equipment and Customer Devices [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,439,890	2,362,459
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	47,872	46,696
Buildings and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	38,187	37,810
Furniture, Fixtures and Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	34,250	34,207
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 7,785	$ 7,785

Accounts Payable, Accrued Expenses and Other Current Liabilities - Summary of Accounts Payable, Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Accrued programming costs	$ 30,746	$ 28,840
Accounts payable - trade	26,588	39,415
Accrued taxes and fees	17,716	16,221
Accrued payroll and benefits	15,049	13,102
Accrued property, plant and equipment	9,357	6,775
Advance customer payments	8,332	13,817
Accrued service costs	8,172	6,171
Bank overdrafts	7,225	3,020
Accrued administrative costs	5,665	4,355
Accrued interest	5,287	7,422
Accrued marketing costs	4,834	3,528
Accrued telecommunications costs	735	816
Other accrued expenses	1,413	4,257
Accounts payable, accrued expenses and other current liabilities	$ 141,119	$ 147,739

Debt - Summary of Outstanding Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total debt	$ 1,260,750	$ 1,577,000
Less: current portion	20,500	20,500
Total long-term debt, gross (less current portion)	1,240,250	1,556,500
Total long-term debt, gross (less current portion)	1,240,250	1,556,500
Less: deferred financing costs, net	14,153	19,420
Total long-term debt, net (less current portion)	1,226,097	1,537,080
Bank Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	1,060,750	1,077,000
5 1/2% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Total debt	$ 200,000	200,000
6 3/8% Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Total debt		$ 300,000

Debt - Summary of Outstanding Debt (Parenthetical) (Detail)	9 Months Ended
	Sep. 30, 2018
5 1/2% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Debt instrument, Interest rate	5.50%
Debt instrument, Maturity	2021
6 3/8% Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Debt instrument, Interest rate	6.375%
Debt instrument, Maturity	2023

Debt - Additional Information (Detail) - USD ($) $ in Thousands			9 Months Ended
	Apr. 02, 2018	Mar. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Mar. 02, 2018
Debt Instrument [Line Items]
Capital contributions from parent	$ 158,000	$ 158,000	$ 208,000	$ 60,000
Loss on early extinguishment of debt			(12,216)	$ (1,966)
Outstanding senior notes			$ 200,000
6 3/8% Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Debt, called for redemption					$ 300,000
Debt instrument, Interest rate			6.375%
5 1/2% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Senior notes expiration date			2021-04
Debt instrument, Interest rate			5.50%
Six Point Three Seven Five Percent Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	$ 309,600
Debt, redemption price percentage	103.188%
Loss on early extinguishment of debt			$ (12,200)
Redemption price paid above par value			9,600
Unamortized financing costs			$ 2,600
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Expiration date of revolving credit commitments			Dec. 31, 2018
Interest rate on borrowings			1.50%
Weighted average interest rate on outstanding borrowings			3.60%
Interest Rate Swap [Member] \| Not Designated as Hedging Instrument [Member]
Debt Instrument [Line Items]
Revolving credit commitment outstanding			$ 600,000
Minimum [Member]
Debt Instrument [Line Items]
Required debt to operating cash flow			1.00%
Maximum [Member]
Debt Instrument [Line Items]
Required debt to operating cash flow			8.50%
Loans Payable [Member]
Debt Instrument [Line Items]
Revolving credit commitment outstanding			$ 31,300
Revolving Credit Commitments at Present [Member] \| 6 3/8% Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Revolving credit commitment outstanding	$ 151,600
Bank Credit Facility [Member]
Debt Instrument [Line Items]
Unused revolving credit commitments			334,000
Letter of Credit [Member]
Debt Instrument [Line Items]
Revolving credit commitment outstanding			9,700
Bank Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit commitment outstanding			$ 1,405,000
Bank Credit Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest coverage ratio			200.00%
Bank Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Leverage ratio			500.00%
Bank Credit Facility [Member] \| Revolving Credit Commitments at Present [Member]
Debt Instrument [Line Items]
Revolving credit commitments			$ 375,000
Expiration date of revolving credit commitments			Nov. 02, 2022
Bank Credit Facility [Member] \| Term Loan A-1 [Member]
Debt Instrument [Line Items]
Revolving credit commitment outstanding			$ 237,500
Expiration date of revolving credit commitments			Nov. 02, 2022
Bank Credit Facility [Member] \| Term Loan M [Member]
Debt Instrument [Line Items]
Revolving credit commitment outstanding			$ 792,000
Expiration date of revolving credit commitments			Jan. 15, 2025

Debt - Fair Values of Senior Notes and Outstanding Debt under Credit Facility (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total senior notes	$ 201,750	$ 515,750
5 1/2% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Total senior notes	201,750	203,750
6 3/8% Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Total senior notes		312,000
Bank Credit Facility [Member]
Debt Instrument [Line Items]
Total senior notes	$ 1,061,740	$ 1,078,995

Debt - Fair Values of Senior Notes and Outstanding Debt under Credit Facility (Parenthetical) (Detail)	9 Months Ended
	Sep. 30, 2018
5 1/2% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Debt instrument, Interest rate	5.50%
Debt instrument, Maturity	2021
6 3/8% Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Debt instrument, Interest rate	6.375%
Debt instrument, Maturity	2023

Preferred Members' Interest - Additional Information (Detail) - Mediacom LLC [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jul. 31, 2001
Class Of Stock [Line Items]
Preferred equity investment					$ 150.0
Percentage of annual cash dividend on preferred equity investment			12.00%
Cash dividends on PMI	$ 4.5	$ 4.5	$ 13.5	$ 13.5

Member's Equity - Additional Information (Detail) - USD ($) $ in Thousands			9 Months Ended
	Apr. 02, 2018	Mar. 30, 2018	Sep. 30, 2018	Sep. 30, 2017
Equity [Abstract]
Capital contributions from parent	$ 158,000	$ 158,000	$ 208,000	$ 60,000
Capital distributions to parent			$ 9,300	$ 5,750

Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Related Party Transaction [Line Items]
Management fees charged by MCC	$ 6,325	$ 5,650	$ 17,675	$ 16,315
MCC [Member]
Related Party Transaction [Line Items]
Management fees charged by MCC	$ 6,300	$ 5,700	$ 17,700	$ 16,300
MCC [Member] \| Management Fees [Member] \| Operating Revenues [Member] \| Maximum [Member]
Related Party Transaction [Line Items]
Rate of annual gross operating revenues of our operating subsidiaries				4.00%

Revenue Recognition - Additional Information (Detail)	3 Months Ended		9 Months Ended
Revenue Recognition - Additional Information (Detail)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) Segment	Sep. 30, 2017 USD ($)
Disaggregation of Revenue [Line Items]
Number of reporting segments affected \| Segment			1
Franchise fees imposed by local governmental authorities	$ 115,781,000	$ 110,885,000	$ 344,090,000	$ 330,877,000
Contract with Customer, Liability, Revenue Recognized	1,800,000		20,600,000
Costs incurred to obtain or fulfill a contract with a customer	14,600,000		14,600,000
Franchise [Member]
Disaggregation of Revenue [Line Items]
Franchise fees imposed by local governmental authorities	5,400,000	$ 5,500,000	16,200,000	$ 16,600,000
Short-term [Member]
Disaggregation of Revenue [Line Items]
Costs incurred to obtain or fulfill a contract with a customer	7,100,000		7,100,000
Long-term [Member]
Disaggregation of Revenue [Line Items]
Costs incurred to obtain or fulfill a contract with a customer	$ 7,500,000		7,500,000
Accounts Receivable [Member]
Disaggregation of Revenue [Line Items]
Impairment of receivables			$ 0
Residential Contracts [Member]
Disaggregation of Revenue [Line Items]
Estimated revenue, expected recognition period	3 years		3 years
Amortization period			Three years
Commercial and Enterprise Contracts [Member] \| Minimum [Member]
Disaggregation of Revenue [Line Items]
Amortization period			1 years
Commercial and Enterprise Contracts [Member] \| Maximum [Member]
Disaggregation of Revenue [Line Items]
Amortization period			10 years
Other Contracts [Member] \| Minimum [Member]
Disaggregation of Revenue [Line Items]
Estimated revenue, expected recognition period	1 year		1 year
Other Contracts [Member] \| Maximum [Member]
Disaggregation of Revenue [Line Items]
Estimated revenue, expected recognition period	10 years		10 years
Costs to Fulfill a Contract - Installation Activities [Member]
Disaggregation of Revenue [Line Items]
Amortization recognized	$ 400,000		$ 1,400,000
Costs to Obtain a Contract - Commissions [Member]
Disaggregation of Revenue [Line Items]
Amortization recognized	$ 1,600,000		$ 5,000,000
Specified Contract Term and Non-Cancelable Service Period [Member] \| Minimum [Member]
Disaggregation of Revenue [Line Items]
Estimated revenue, expected recognition period	1 year		1 year
Specified Contract Term and Non-Cancelable Service Period [Member] \| Maximum [Member]
Disaggregation of Revenue [Line Items]
Estimated revenue, expected recognition period	10 years		10 years

Revenue Recognition - Summary of Disaggregation of Revenue Qualitative Reconciliation (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Total revenues	$ 276,394	$ 265,037	$ 820,827	$ 792,450
Video [Member]
Disaggregation of Revenue [Line Items]
Total revenues	104,679		320,163
Data [Member]
Disaggregation of Revenue [Line Items]
Total revenues	102,834		300,358
Phone [Member]
Disaggregation of Revenue [Line Items]
Total revenues	15,540		45,960
Business [Member]
Disaggregation of Revenue [Line Items]
Total revenues	41,951		123,786
Advertising [Member]
Disaggregation of Revenue [Line Items]
Total revenues	$ 11,390		$ 30,560

Sale of Assets - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 25, 2018	Mar. 15, 2018	Dec. 21, 2017	Sep. 30, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net book value				$ 842,383	$ 825,348
CTI Towers [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net book value	$ 100	$ 100	$ 100
Reduction of asset retirement obligation (liability) in conjunction of sale	$ 1,400	$ 1,400	$ 1,400