Document and Entity Information	3 Months Ended
Document and Entity Information	Mar. 31, 2017 shares
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q1
Trading Symbol	MCCCB
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 Common Stock, Shares Outstanding	0

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
CURRENT ASSETS
Cash	$ 9,502	$ 14,208
Accounts receivable, net of allowance for doubtful accounts of $3,022 and $3,857	64,116	67,724
Prepaid expenses and other current assets	18,001	14,562
Total current assets	91,619	96,494
Property, plant and equipment, net of accumulated depreciation of $1,640,182 and $1,619,301	825,867	816,389
Franchise rights	1,176,908	1,176,908
Goodwill	195,945	195,945
Other assets, net of accumulated amortization of $4,273 and $4,101	7,602	6,418
Total assets	2,297,941	2,292,154
CURRENT LIABILITIES
Accounts payable, accrued expenses and other current liabilities	152,955	154,818
Accounts payable - affiliates	17,081	14,852
Deferred revenue	40,820	39,856
Current portion of long-term debt	16,575	16,575
Total current liabilities	227,431	226,101
Long-term debt, net (less current portion)	1,560,988	1,597,075
Other non-current liabilities	1,443	1,486
Total liabilities	1,789,862	1,824,662
Commitments and contingencies (Note 10)
PREFERRED MEMBERS' INTEREST (Note 7)	150,000	150,000
MEMBER'S EQUITY
Capital distributions	(38,115)	(37,348)
Retained earnings	396,194	354,840
Total member's equity	358,079	317,492
Total liabilities, preferred members' interest and member's equity	$ 2,297,941	$ 2,292,154

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 3,022	$ 3,857
Accumulated depreciation on property, plant and equipment	1,640,182	1,619,301
Accumulated amortization on other assets	$ 4,273	$ 4,101

Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Revenues	$ 261,508	$ 255,218
Costs and expenses:
Service costs (exclusive of depreciation and amortization)	109,062	104,475
Selling, general and administrative expenses	47,517	46,968
Management fee expense	5,650	5,350
Depreciation and amortization	36,579	35,328
Operating income	62,700	63,097
Interest expense, net	(17,793)	(20,667)
Gain (loss) on derivatives, net	1,265	(7,260)
Other expense, net	(318)	(469)
Net income	45,854	34,701
Dividend to preferred members (Note 7)	(4,500)	(4,500)
Net income applicable to member	$ 41,354	$ 30,201

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 45,854	$ 34,701
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation and amortization	36,579	35,328
(Gain) loss on derivatives, net	(1,265)	7,260
Amortization of deferred financing costs	1,056	1,588
Changes in assets and liabilities:
Accounts receivable, net	3,608	7,251
Prepaid expenses and other assets	(5,390)	(3,387)
Accounts payable, accrued expenses and other current liabilities	(2,521)	5,083
Accounts payable - affiliates	2,229	5,488
Deferred revenue	964	1,114
Other non-current liabilities	(43)	(23)
Net cash flows provided by operating activities	81,071	94,403
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(46,037)	(42,345)
Change in accrued property, plant and equipment	3,358	1,074
Proceeds from sale of assets	52	78
Net cash flows used in investing activities	(42,627)	(41,193)
CASH FLOWS FROM FINANCING ACTIVITIES:
New borrowings of bank debt	78,000	24,519
Repayment of bank debt	(115,000)	(74,269)
Dividend payments on preferred members' interest (Note 7)	(4,500)	(4,500)
Capital distributions to parent (Note 8)	(800)	0
Other financing activities	(850)	709
Net cash flows used in financing activities	(43,150)	(53,541)
Net change in cash	(4,706)	(331)
CASH, beginning of period	14,208	10,442
CASH, end of period	9,502	10,111
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest, net of amounts capitalized	$ 12,067	$ 11,825

Organization	3 Months Ended
Organization	Mar. 31, 2017
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, 2016. 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, 2017. 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. 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 $5.5 million and $6.0 million for the three months ended March 31, 2017 and 2016, respectively.

Recent Accounting Pronouncements	3 Months Ended
Recent Accounting Pronouncements	Mar. 31, 2017
Accounting Changes and Error Corrections [Abstract]
Recent Accounting Pronouncements	2. RECENT ACCOUNTING PRONOUNCEMENTS In May 2014, the FASB issued ASU No. 2014-09 (“ASU 2014-09”) – Revenue from Contracts with Customers. The guidance states that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. An entity should also disclose sufficient information to enable users of financial statements to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. This guidance supersedes most industry-specific guidance, including Statement of Financial Accounting Standards No. 51 – Financial Reporting by Cable Television Companies. In August 2015, the FASB issued ASU No. 2015-14, Revenue from Contracts with Customers, which deferred by one year the effective date of ASU 2014-09 until reporting periods beginning after December 15, 2017, including interim periods within the reporting periods. The FASB is permitting early adoption of the updated accounting guidance, but not before the original effective date of December 15, 2016. Based on a preliminary assessment of certain revenue transactions performed to date, we expect that the new guidance will impact the timing of the recognition of installation revenue and commission expenses. Under the new guidance, these amounts will be recognized as revenue and expenses, respectively, over a period of time instead of immediately, as is being done under current practice. Installation revenues and commission expenses recorded in the year ended December 31, 2016 are each less than 2% of total revenues recorded in the same period. We are currently in the process of evaluating which method of transition will be utilized at adoption. We continue to assess all of the potential impacts that the adoption of ASU 2014-09 will have on our consolidated financial statements, including the development of new accounting policies, procedures and internal controls associated with the adoption of the standard. In February 2016, the FASB issued ASU 2016-02—Leases (Topic 842) (“ASU 2016-02”). 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. This guidance is effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2018. We have not completed our evaluation of this new guidance. 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. We do not expect ASU 2016-15 will have a material impact on our financial position, operations or cash flows upon adoption.

- Definition

The entire disclosure for reporting accounting changes and error corrections. It includes the conveyance of information necessary for a user of the Company's financial information to understand all aspects and required disclosure information concerning all changes and error corrections reported in the Company's financial statements for the period.

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Fair Value

3 Months Ended

Mar. 31, 2017

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 March 31, 2017
	Level 1		Level 2		Level 3		Total
Assets
Interest rate exchange agreements	$	—	$	591	$	—	$	591
Liabilities
Interest rate exchange agreements	$	—	$	—	$	—	$	—


	Fair Value as of December 31, 2016
	Level 1		Level 2		Level 3		Total
Assets
Interest rate exchange agreements	$	—	$	1,089	$	—	$	1,089
Liabilities
Interest rate exchange agreements	$	—	$	1,763	$	—	$	1,763

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 March 31, 2017, we recorded a current asset and a long-term asset of $0.1 million and $0.5 million, respectively, and no current or long-term liability. As of December 31, 2016, we recorded a long-term asset of $1.1 million, a current liability in accounts payable, accrued expenses and other current liabilities of $1.8 million, and no current assets or long-term liabilities.

As a result of the changes in the mark-to-market valuations on our interest rate swaps, we recorded a net gain on derivatives of $1.3 million and a net loss on derivatives of $7.3 million for the three months ended March 31, 2017 and 2016, 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

3 Months Ended

Mar. 31, 2017

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):


	March 31, 2017			December 31, 2016
Cable systems, equipment and customer devices	$	2,344,006		$	2,314,715
Vehicles		43,152			42,334
Buildings and leasehold improvements		36,906			36,708
Furniture, fixtures and office equipment		34,144			34,092
Land and land improvements		7,841			7,841

Property, plant and equipment, gross	$	2,466,049		$	2,435,690
Accumulated depreciation		(1,640,182	)		(1,619,301	)

Property, plant and equipment, net	$	825,867		$	816,389

Accounts Payable, Accrued Expenses and Other Current Liabilities

3 Months Ended

Mar. 31, 2017

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):


	March 31, 2017		December 31, 2016
Accounts payable—trade	$	32,964	$	42,094
Accrued programming costs		27,927		25,856
Accrued taxes and fees		17,391		17,212
Advance customer payments		14,920		13,902
Accrued interest		14,640		10,080
Accrued payroll and benefits		13,760		13,795
Accrued property, plant and equipment		8,308		4,950
Accrued service costs		6,872		6,810
Bank overdrafts ⁽¹⁾		6,449		7,387
Accrued administrative costs		4,344		5,381
Accrued marketing costs		3,659		3,193
Accrued telecommunications costs		622		878
Liabilities under interest rate exchange agreements		—		1,763
Other accrued expenses		1,099		1,517

Accounts payable, accrued expenses and other current liabilities	$	152,955	$	154,818

(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

3 Months Ended

Mar. 31, 2017

Debt Disclosure [Abstract]

Debt

6. DEBT

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


	March 31,		December 31,
	2017		2016
Bank credit facility	$	1,091,000	$	1,128,000
5¹⁄₂% senior notes due 2021		200,000		200,000
6³⁄₈% senior notes due 2023		300,000		300,000

Total debt	$	1,591,000	$	1,628,000
Less: current portion		16,575		16,575

Total long-term debt, gross (less current portion)	$	1,574,425	$	1,611,425
Less: deferred financing costs, net		13,437		14,350

Total long-term debt, net (less current portion)	$	1,560,988	$	1,597,075

Bank Credit Facility

As of March 31, 2017, we maintained a $1.380 billion bank credit facility (the “credit facility”), comprising:

•

$368.5 million of revolving credit commitments, which expire on October 10, 2019;

•

$142.0 million of outstanding borrowings under Term Loan A, which mature on January 15, 2021;

•

$577.5 million of outstanding borrowings under Term Loan H, which mature on January 29, 2021;

•

$291.8 million of outstanding borrowings under Term Loan J, which mature on June 30, 2021.

As of March 31, 2017, we had $279.1 million of unused revolving credit commitments, all of which were available to be borrowed and used for general corporate purposes, after giving effect to approximately $79.7 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 March 31, 2017, 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 March 31, 2017, 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 at 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 the three months ended, March 31, 2017 and 2016. As of March 31, 2017, we had interest rate swaps that fixed the variable portion of $600 million of borrowings at a rate of 1.5%, all of which are scheduled to expire during December 2018.

As of March 31, 2017, 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 March 31, 2017, we had $500 million of outstanding senior notes, comprising $200 million of 5¹⁄₂% senior notes due April 2021 and $300 million of 6³⁄₈% senior notes due April 2023. Our senior notes are unsecured obligations, and the indentures governing our senior notes (the “indentures”) limit the incurrence of additional indebtedness based upon a maximum debt to operating cash flow ratio (as defined in the indentures) of 8.5 to 1.0. For all periods through March 31, 2017, we were in compliance with all covenants under the indentures. As of the same date, the indentures 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 indentures.

Debt Ratings

MCC’s corporate credit ratings are currently Ba3 by Moody’s, with a positive outlook, and BB by Standard and Poor’s (“S&P”), with a stable outlook, and our senior unsecured ratings are currently B2 by Moody’s, with a positive outlook, and B+ by S&P, with a stable outlook. There are no covenants, events of default, borrowing conditions or other terms in the credit agreement or indentures 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):


	March 31,		December 31,
	2017		2016
5¹⁄₂% senior notes due 2021	$	205,000	$	205,500
6³⁄₈% senior notes due 2023		315,750		316,500

Total senior notes	$	520,750	$	522,000

Bank credit facility	$	1,097,155	$	1,135,633

Preferred Members' Interest	3 Months Ended
Preferred Members' Interest	Mar. 31, 2017
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 March 31, 2017 and 2016.

Member's Equity	3 Months Ended
Member's Equity	Mar. 31, 2017
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 distributions to parent and capital contributions from parent are reported on a gross basis in the Consolidated Statements of Cash Flows. We made capital distributions to parent in cash of $0.8 million and $0 for the three months ended March 31, 2017 and 2016, respectively. We received no capital contributions from parent for the three months ended March 31, 2017 and 2016.

Related Party Transactions	3 Months Ended
Related Party Transactions	Mar. 31, 2017
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 $5.7 million and $5.4 million for the three months ended March 31, 2017 and 2016, respectively. Mediacom LLC is a preferred equity investor in us. See Note 7.

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2017
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 will not have a material adverse effect on our consolidated financial position, results of operations, cash flows or business.

Goodwill and Other Intangible Assets	3 Months Ended
Goodwill and Other Intangible Assets	Mar. 31, 2017
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, 2016 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, 2016 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 three months of 2017, 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 March 31, 2017.

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Organization (Policies)	3 Months Ended
Organization (Policies)	Mar. 31, 2017
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, 2016. 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, 2017. 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. 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 $5.5 million and $6.0 million for the three months ended March 31, 2017 and 2016, respectively.

Fair Value (Tables)

3 Months Ended

Mar. 31, 2017

Fair Value Disclosures [Abstract]

Fair Value of Interest Rate Swap Assets and Liabilities

	Fair Value as of March 31, 2017
		Level 1		Level 2		Level 3		Total
Assets
Interest rate exchange agreements		$	—	$	591	$	—	$	591
Liabilities
Interest rate exchange agreements		$	—	$	—	$	—	$	—


	Fair Value as of December 31, 2016
	Level 1		Level 2		Level 3		Total
Assets
Interest rate exchange agreements	$	—	$	1,089	$	—	$	1,089
Liabilities
Interest rate exchange agreements	$	—	$	1,763	$	—	$	1,763

Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 2017

Property, Plant and Equipment [Abstract]

Components of Property, Plant and Equipment

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


	March 31, 2017			December 31, 2016
Cable systems, equipment and customer devices	$	2,344,006		$	2,314,715
Vehicles		43,152			42,334
Buildings and leasehold improvements		36,906			36,708
Furniture, fixtures and office equipment		34,144			34,092
Land and land improvements		7,841			7,841

Property, plant and equipment, gross	$	2,466,049		$	2,435,690
Accumulated depreciation		(1,640,182	)		(1,619,301	)

Property, plant and equipment, net	$	825,867		$	816,389

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

3 Months Ended

Mar. 31, 2017

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):


	March 31, 2017		December 31, 2016
Accounts payable—trade	$	32,964	$	42,094
Accrued programming costs		27,927		25,856
Accrued taxes and fees		17,391		17,212
Advance customer payments		14,920		13,902
Accrued interest		14,640		10,080
Accrued payroll and benefits		13,760		13,795
Accrued property, plant and equipment		8,308		4,950
Accrued service costs		6,872		6,810
Bank overdrafts ⁽¹⁾		6,449		7,387
Accrued administrative costs		4,344		5,381
Accrued marketing costs		3,659		3,193
Accrued telecommunications costs		622		878
Liabilities under interest rate exchange agreements		—		1,763
Other accrued expenses		1,099		1,517

Accounts payable, accrued expenses and other current liabilities	$	152,955	$	154,818

(1)

Debt (Tables)

3 Months Ended

Mar. 31, 2017

Debt Disclosure [Abstract]

Summary of Outstanding Debt

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


	March 31,		December 31,
	2017		2016
Bank credit facility	$	1,091,000	$	1,128,000
5¹⁄₂% senior notes due 2021		200,000		200,000
6³⁄₈% senior notes due 2023		300,000		300,000

Total debt	$	1,591,000	$	1,628,000
Less: current portion		16,575		16,575

Total long-term debt, gross (less current portion)	$	1,574,425	$	1,611,425
Less: deferred financing costs, net		13,437		14,350

Total long-term debt, net (less current portion)	$	1,560,988	$	1,597,075

Fair Values of Senior Notes and Outstanding Debt under Credit Facility


	March 31,		December 31,
	2017		2016
5¹⁄₂% senior notes due 2021	$	205,000	$	205,500
6³⁄₈% senior notes due 2023		315,750		316,500

Total senior notes	$	520,750	$	522,000

Bank credit facility	$	1,097,155	$	1,135,633

Organization - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Amount due from affiliate by subsidiary	$ 100
Franchise fees imposed by local governmental authorities	$ 5,500,000	$ 6,000,000

- 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-06(3)(a)(3))
-URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e604059-122996

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39599-107864

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(3))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(11))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-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

+ Details

Recent Accounting Pronouncements - Additional Information (Detail) - Maximum [Member]	12 Months Ended
	Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Percentage of installation revenues to revenue	2.00%
Percentage of commission expenses to revenue	2.00%

Fair Value - Fair Value of Interest Rate Swap Assets and Liabilities (Detail) - Interest Rate Swap [Member] - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	$ 591	$ 1,089
Liabilities		1,763
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	$ 591	1,089
Liabilities		$ 1,763

Fair Value - Additional Information (Detail) - USD ($)	3 Months Ended
Fair Value - Additional Information (Detail) - USD ($)	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Current liability in accounts payable, accrued expenses and other current liabilities	$ 0		$ 1,763,000
Long-term liability	0		0
Long term assets	500,000		1,100,000
Current assets	100,000		$ 0
Net gain (loss) on derivatives	$ 1,300,000	$ 7,300,000

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References + Details

Property, Plant and Equipment - Components of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,466,049	$ 2,435,690
Accumulated depreciation	(1,640,182)	(1,619,301)
Property, plant and equipment, net	825,867	816,389
Cable Systems, Equipment and Customer Devices [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,344,006	2,314,715
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	43,152	42,334
Buildings and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	36,906	36,708
Furniture, Fixtures and Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	34,144	34,092
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 7,841	$ 7,841

Accounts Payable, Accrued Expenses and Other Current Liabilities - Summary of Accounts Payable, Accrued Expenses and Other Current Liabilities (Detail) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Accounts payable - trade	$ 32,964,000	$ 42,094,000
Accrued programming costs	27,927,000	25,856,000
Accrued taxes and fees	17,391,000	17,212,000
Advance customer payments	14,920,000	13,902,000
Accrued interest	14,640,000	10,080,000
Accrued payroll and benefits	13,760,000	13,795,000
Accrued property, plant and equipment	8,308,000	4,950,000
Accrued service costs	6,872,000	6,810,000
Bank overdrafts	6,449,000	7,387,000
Accrued administrative costs	4,344,000	5,381,000
Accrued marketing costs	3,659,000	3,193,000
Accrued telecommunications costs	622,000	878,000
Liabilities under interest rate exchange agreements	0	1,763,000
Other accrued expenses	1,099,000	1,517,000
Accounts payable, accrued expenses and other current liabilities	$ 152,955,000	$ 154,818,000

Debt - Summary of Outstanding Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total debt	$ 1,591,000	$ 1,628,000
Total debt	1,591,000	1,628,000
Less: current portion	16,575	16,575
Total long-term debt, gross (less current portion)	1,574,425	1,611,425
Less: deferred financing costs, net	13,437	14,350
Total long-term debt, net (less current portion)	1,560,988	1,597,075
Bank Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	1,091,000	1,128,000
Total debt	1,091,000	1,128,000
5 1/2% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Total debt	200,000	200,000
Total debt	200,000	200,000
6 3/8% Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Total debt	300,000	300,000
Total debt	$ 300,000	$ 300,000

Debt - Summary of Outstanding Debt (Parenthetical) (Detail)	3 Months Ended
	Mar. 31, 2017
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) $ in Millions	3 Months Ended
Debt - Additional Information (Detail) $ in Millions	Mar. 31, 2017 USD ($)
Debt Instrument [Line Items]
Outstanding senior notes	$ 500.0
5 1/2% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Outstanding senior notes	$ 200.0
Senior notes expiration date	2021-04
6 3/8% Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Outstanding senior notes	$ 300.0
Senior notes expiration date	2023-04
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	$ 600.0
Maximum [Member]
Debt Instrument [Line Items]
Required debt to operating cash flow	8.50%
Minimum [Member]
Debt Instrument [Line Items]
Required debt to operating cash flow	1.00%
Loans Payable [Member]
Debt Instrument [Line Items]
Revolving credit commitment outstanding	$ 79.7
Bank Credit Facility [Member]
Debt Instrument [Line Items]
Unused revolving credit commitments	279.1
Letter of Credit [Member]
Debt Instrument [Line Items]
Revolving credit commitment outstanding	9.7
Bank Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit commitment outstanding	$ 1,380.0
Bank Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Leverage ratio	500.00%
Interest coverage ratio	200.00%
Bank Credit Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Leverage ratio	100.00%
Interest coverage ratio	100.00%
Bank Credit Facility [Member] \| Revolving Credit Commitments at Present [Member]
Debt Instrument [Line Items]
Revolving credit commitments	$ 368.5
Expiration date of revolving credit commitments	Oct. 10, 2019
Bank Credit Facility [Member] \| Term Loan J [Member]
Debt Instrument [Line Items]
Revolving credit commitment outstanding	$ 291.8
Expiration date of revolving credit commitments	Jun. 30, 2021
Bank Credit Facility [Member] \| Term Loan A [Member]
Debt Instrument [Line Items]
Revolving credit commitment outstanding	$ 142.0
Expiration date of revolving credit commitments	Jan. 15, 2021
Bank Credit Facility [Member] \| Term Loan H [Member]
Debt Instrument [Line Items]
Revolving credit commitment outstanding	$ 577.5
Expiration date of revolving credit commitments	Jan. 29, 2021

Debt - Fair Values of Senior Notes and Outstanding Debt under Credit Facility (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total senior notes	$ 520,750	$ 522,000
5 1/2% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Total senior notes	205,000	205,500
6 3/8% Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Total senior notes	315,750	316,500
Bank Credit Facility [Member]
Debt Instrument [Line Items]
Total senior notes	$ 1,097,155	$ 1,135,633

Debt - Fair Values of Senior Notes and Outstanding Debt under Credit Facility (Parenthetical) (Detail)	3 Months Ended
	Mar. 31, 2017
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
	Mar. 31, 2017	Mar. 31, 2016	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

Member's Equity - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Equity [Abstract]
Received capital contributions from parent	$ 0	$ 0
Capital distributions to parent	$ 800,000	$ 0

Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Related Party Transaction [Line Items]
Management fees charged by MCC	$ 5,650	$ 5,350
MCC [Member]
Related Party Transaction [Line Items]
Management fees charged by MCC	$ 5,700	$ 5,400
Management Fees [Member] \| MCC [Member] \| Maximum [Member] \| Operating Revenues [Member]
Related Party Transaction [Line Items]
Rate of annual gross operating revenues of our operating subsidiaries	4.00%