Document and Entity Information	3 Months Ended
Document and Entity Information	Mar. 31, 2016 shares
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q1
Trading Symbol	MCCCL
Entity Registrant Name	MEDIACOM LLC
Entity Central Index Key	0001064116
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, 2016	Dec. 31, 2015
CURRENT ASSETS
Cash	$ 8,106	$ 8,446
Accounts receivable, net of allowance for doubtful accounts of $1,939 and $2,267	40,126	42,576
Accounts receivable - affiliates	16,163	2,970
Prepaid expenses and other current assets	13,831	10,779
Total current assets	78,226	64,771
Preferred membership interest in affiliated company (Note 7)	150,000	150,000
Property, plant and equipment, net of accumulated depreciation of $1,688,156 and $1,671,048	696,222	689,897
Franchise rights	614,731	614,731
Goodwill	23,911	23,911
Subscriber lists, net of accumulated amortization of $118,295 and $118,291	47	51
Other assets, net of accumulated amortization of $1,531 and $1,366	5,555	6,940
Total assets	1,568,692	1,550,301
CURRENT LIABILITIES
Accounts payable, accrued expenses and other current liabilities	113,159	126,410
Deferred revenue	30,558	29,383
Current portion of long-term debt	14,554	14,555
Total current liabilities	158,271	170,348
Long-term debt, net (less current portion)	1,145,012	1,144,660
Other non-current liabilities	5,662	2,577
Total liabilities	$ 1,308,945	$ 1,317,585
Commitments and contingencies (Note 10)
MEMBER'S EQUITY
Capital contributions	$ 461,122	$ 461,101
Accumulated deficit	(201,375)	(228,385)
Total member's equity	259,747	232,716
Total liabilities and member's equity	$ 1,568,692	$ 1,550,301

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 1,939	$ 2,267
Accumulated depreciation on property, plant and equipment	1,688,156	1,671,048
Accumulated amortization on Intangible assets	118,295	118,291
Accumulated amortization on other assets	$ 1,531	$ 1,366

Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Revenues	$ 189,569	$ 180,044
Costs and expenses:
Service costs (exclusive of depreciation and amortization)	84,951	80,644
Selling, general and administrative expenses	30,340	28,844
Management fee expense	3,650	3,250
Depreciation and amortization	29,907	29,894
Operating income	40,721	37,412
Interest expense, net	(13,070)	(15,978)
(Loss) gain on derivatives, net	(4,697)	2,578
Investment income from affiliate (Note 7)	4,500	4,500
Other expense, net	(444)	(229)
Net income	$ 27,010	$ 28,283

Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
Consolidated Statements of Cash Flows - USD ($)	Mar. 31, 2016	Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 27,010,000	$ 28,283,000
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation and amortization	29,907,000	29,894,000
Loss (gain) on derivatives, net	4,697,000	(2,578,000)
Amortization of deferred financing costs	734,000	722,000
Changes in assets and liabilities:
Accounts receivable, net	2,450,000	7,351,000
Accounts receivable - affiliates	(13,193,000)	(3,606,000)
Prepaid expenses and other assets	(2,927,000)	(4,572,000)
Accounts payable, accrued expenses and other current liabilities	(12,108,000)	(1,877,000)
Accounts payable - affiliates		(1,463,000)
Deferred revenue	1,175,000	736,000
Other non-current liabilities	(43,000)
Net cash flows provided by operating activities	37,702,000	52,890,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(36,218,000)	(28,580,000)
Change in accrued property, plant and equipment	(914,000)	603,000
Proceeds from sale of assets	42,000	41,000
Acquisition of other intangible assets		(1,249,000)
Net cash flows used in investing activities	(37,090,000)	(29,185,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
New borrowings of bank debt	48,000,000	43,000,000
Repayment of bank debt	(48,250,000)	(60,000,000)
Capital distributions to parent (Note 8)	0	(5,000,000)
Other financing activities	(702,000)	(545,000)
Net cash flows used in financing activities	(952,000)	(22,545,000)
Net change in cash	(340,000)	1,160,000
CASH, beginning of period	8,446,000	8,720,000
CASH, end of period	8,106,000	9,880,000
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest, net of amounts capitalized	$ 17,130,000	$ 19,820,000

ORGANIZATION	3 Months Ended
ORGANIZATION	Mar. 31, 2016
Accounting Policies [Abstract]
ORGANIZATION	1. ORGANIZATION Basis of Preparation of Unaudited Consolidated Financial Statements Mediacom LLC (“Mediacom LLC” and collectively with its subsidiaries, “we,” “our” or “us”) is a New York 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 Broadband LLC, a Delaware limited liability company wholly-owned by MCC. As limited liability companies, we and Mediacom Broadband 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 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 and financial position 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, 2015. 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, 2016. Mediacom Capital Corporation (“Mediacom Capital”), a New York corporation wholly-owned by us, co-issued, jointly and severally with us, public debt securities. Mediacom Capital 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 with a corresponding operating expense. Franchise fees reported on a gross basis amounted to $3.1 million and $3.0 million for the three months ended March 31, 2016 and 2015, respectively. Reclassifications Certain reclassifications have been made to prior year amounts to conform to the current year presentation.

RECENT ACCOUNTING PRONOUNCEMENTS	3 Months Ended
RECENT ACCOUNTING PRONOUNCEMENTS	Mar. 31, 2016
Accounting Changes And Error Corrections [Abstract]
RECENT ACCOUNTING PRONOUNCEMENTS	2. RECENT ACCOUNTING PRONOUNCEMENTS In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09 - Revenue from Contracts with Customers (“ASU 2014-09”). 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 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 period. The FASB is permitting early adoption of the updated accounting guidance, but not before the original effective date of December 15, 2016. We are currently evaluating the methods of adoption allowed by the new standard and the effect the standard is expected to have on our consolidated financial statements and related disclosures. In April 2015 (as amended in August 2015), the FASB issued ASU No. 2015-03 (and ASU 2015-15) - Interest—Imputation of Interest (Subtopic 835-30) Simplifying the Presentation of Debt Issuance Costs (“ASU 2015-03”). The purpose of this guidance is to simplify the presentation of debt issuance costs and requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. For public business entities, the amendments in this update are effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. An entity should apply the new guidance on a retrospective basis, wherein the balance sheet of each individual period presented should be adjusted to reflect the period-specific effects of applying the new guidance. We adopted ASU 2015-03 and ASU 2015-15 as of January 1, 2016 and implemented retrospectively as of December 31, 2015. We reclassified $10.4 million of deferred financing costs from other assets, net to long-term debt, net (less current portion) as of March 31, 2016 in accordance with such guidance. We reclassified $11.0 million of deferred financing costs from other assets, net to long-term debt, net (less current portion) as of December 31, 2015 in accordance with such guidance. See Note 6. In April 2015, the FASB issued ASU 2015-05 - Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40) (“ASU 2015-05”). The objective of ASU 2015-05 is to address the concerns of stakeholders that the lack of guidance about a customer’s accounting for fees in a cloud computing arrangement leads to unnecessary cost and complexity when evaluating the accounting for those fees, as well as some diversity in practice. The amendments in ASU 2015-05 will help entities evaluate the accounting for fees paid by a customer in a cloud computing arrangement by providing guidance as to whether an arrangement includes the sale or license of software. Examples of cloud computing arrangements include software as a service, platform as a service, infrastructure as a service, and other similar hosting arrangements. This guidance is effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2015. We adopted this new guidance as of January 1, 2016 and determined that there was not a significant impact to our operations. 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.

FAIR VALUE

3 Months Ended

Mar. 31, 2016

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, 2016
	Level 1		Level 2		Level 3		Total
Assets
Interest rate exchange agreements	$	—	$	—	$	—	$	—
Liabilities
Interest rate exchange agreements	$	—	$	6,098	$	—	$	6,098

	Fair Value as of December 31, 2015
	Level 1		Level 2		Level 3		Total
Assets
Interest rate exchange agreements	$	—	$	1,096	$	—	$	1,096
Liabilities
Interest rate exchange agreements	$	—	$	2,497	$	—	$	2,497

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, 2016, we recorded a current liability in accounts payable, accrued expenses and other current liabilities of $3.0 million, a long-term liability in other non-current liabilities of $3.1 million, and no current or long-term assets. As of December 31, 2015, we recorded a long term asset of $1.1 million, and a current liability in accounts payable, accrued expenses and other current liabilities of $2.5 million. As of December 31, 2015, we recorded 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 loss on derivatives of $4.7 million and a net gain on derivatives of $2.6 million for the three months ended March 31, 2016 and 2015, 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, 2016

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,			December 31,
	2016			2015
Cable systems, equipment and customer devices	$	2,283,187		$	2,257,473
Furniture, fixtures and office equipment		43,201			44,878
Vehicles		38,910			39,531
Buildings and leasehold improvements		17,530			17,513
Land and land improvements		1,550			1,550
Property, plant and equipment, gross	$	2,384,378		$	2,360,945
Accumulated depreciation		(1,688,156	)		(1,671,048	)
Property, plant and equipment, net	$	696,222		$	689,897

ACCOUNTS PAYABLE, ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES

3 Months Ended

Mar. 31, 2016

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,		December 31,
	2016		2015
Accounts payable - trade	$	22,620	$	32,722
Accrued programming costs		21,398		20,433
Accrued payroll and benefits		11,917		10,898
Accrued taxes and fees		11,474		13,138
Accrued property, plant and equipment		9,042		9,956
Advance customer payments		8,650		8,009
Accrued service costs		6,376		6,035
Bank overdrafts ⁽¹⁾		5,329		6,031
Accrued interest		4,493		9,051
Liabilities under interest rate exchange agreements		2,970		2,497
Accrued telecommunications costs		1,356		1,473
Other accrued expenses		7,534		6,167
Accounts payable, accrued expenses and other current liabilities	$	113,159	$	126,410

(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, 2016

Debt Disclosure [Abstract]

DEBT

6. DEBT

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

	March 31,		December 31,
	2016		2015
Bank credit facility	$	920,000	$	920,250
7¼% senior notes due 2022		250,000		250,000
Total debt	$	1,170,000	$	1,170,250
Less: current portion		14,554		14,555
Total long-term debt, gross (less current portion)	$	1,155,446	$	1,155,695
Less: deferred financing costs, net		10,434		11,035
Total long-term debt, net (less current portion)	$	1,145,012	$	1,144,660

Bank Credit Facility

As of March 31, 2016, we maintained a $1.187 billion bank credit facility (the “credit facility”), comprising:

$362.5 million of revolving credit commitments, which expire on February 5, 2019;

$151.6 million of outstanding borrowings under Term Loan A, which mature on November 15, 2021;

$82.9 million of outstanding borrowings under Term Loan E, which mature on October 23, 2017;

$245.0 million of outstanding borrowings under Term Loan F, which mature on March 31, 2018; and

$344.8 million of outstanding borrowings under Term Loan G, which mature on June 30, 2021.

As of March 31, 2016, we had $258.5 million of unused revolving credit commitments, all of which were available to be borrowed and used for general corporate purposes, after giving effect to $95.8 million of outstanding loans and $8.2 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, 2016, 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, 2016, our operating subsidiaries were in compliance with all covenants under the credit agreement.

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, 2016 and 2015. As of March 31, 2016, we had interest rate swaps that fixed the variable portion of $400 million of borrowings at a rate of 1.5%, all of which are scheduled to expire during December 2018.

As of March 31, 2016, the weighted average interest rate on outstanding borrowings under the credit facility, including the effect of our interest rate swaps, was 3.5%.

Senior Notes

As of March 31, 2016, we had $250 million of outstanding senior notes, all of which comprised our 7¼% senior notes due February 2022 (the “7¼% Notes”). Our senior notes are unsecured obligations, and the indenture governing the 7¼% 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 March 31, 2016, we were in compliance with all covenants under the indenture.

Deferred Financing Costs

We adopted ASU 2015-03 and ASU 2015-15 as of January 1, 2016 and implemented retrospectively as of December 31, 2015. We reclassified $10.4 million of deferred financing costs from other assets, net to long-term debt, net (less current portion) as of March 31, 2016 in accordance with such guidance. We reclassified $11.0 million of deferred financing costs from other assets, net to long-term debt, net (less current portion) as of December 31, 2015 in accordance with such guidance. See Note 2.

Debt Ratings

MCC’s corporate credit ratings are Ba3 by Moody’s and BB by Standard and Poor’s (“S&P”), and our senior unsecured ratings are B2 by Moody’s and B+ by S&P, all with a stable outlook. 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 bank credit facility are calculated based upon unobservable inputs that are corroborated by market data that we determine to be Level 2. The fair value of our senior notes and outstanding debt under the credit facility were as follows (dollars in thousands):

	March 31,		December 31,
	2016		2015
7¼% senior notes due 2022		259,375		251,250
Total senior notes	$	259,375	$	251,250
Bank credit facility	$	917,628	$	912,944

PREFERRED MEMBERSHIP INTEREST IN AFFILIATED COMPANY	3 Months Ended
PREFERRED MEMBERSHIP INTEREST IN AFFILIATED COMPANY	Mar. 31, 2016
Equity Method Investments And Joint Ventures [Abstract]
PREFERRED MEMBERSHIP INTEREST IN AFFILIATED COMPANY	7. PREFERRED MEMBERSHIP INTEREST IN AFFILIATED COMPANY In July 2001, we made a $150.0 million preferred membership investment in the operating subsidiaries of Mediacom Broadband LLC, which has a 12% annual dividend, payable quarterly in cash. We received $4.5 million in cash dividends on the preferred membership interest during each of the three months ended March 31, 2016 and 2015.

MEMBER'S EQUITY	3 Months Ended
MEMBER'S EQUITY	Mar. 31, 2016
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 from parent and capital distributions to parent are reported on a gross basis in the Consolidated Statements of Cash Flows. We made no capital distributions to parent and no capital contributions were received from parent during the three months ended March 31, 2016. We made capital distributions to parent of $5.0 million and received no capital contributions from parent during the three months ended March 31, 2015.

RELATED PARTY TRANSACTIONS	3 Months Ended
RELATED PARTY TRANSACTIONS	Mar. 31, 2016
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 to receive management fees in an amount not to exceed 4.5% of the annual gross operating revenues of our operating subsidiaries, and is also entitled to the reimbursement of all expenses necessarily incurred in its capacity as manager. MCC charged us management fees of $3.7 million and $3.3 million for the three months ended March 31, 2016 and 2015, respectively. We are a preferred equity investor in Mediacom Broadband LLC. See Note 7.

- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

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COMMITMENTS AND CONTINGENCIES	3 Months Ended
COMMITMENTS AND CONTINGENCIES	Mar. 31, 2016
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, 2016
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 LLC reporting unit as of October 1, 2015 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, 2015 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 2016, 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, 2016.

- 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, 2016
Accounting Policies [Abstract]
Basis of Preparation of Unaudited Consolidated Financial Statements	Basis of Preparation of Unaudited Consolidated Financial Statements Mediacom LLC (“Mediacom LLC” and collectively with its subsidiaries, “we,” “our” or “us”) is a New York 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 Broadband LLC, a Delaware limited liability company wholly-owned by MCC. As limited liability companies, we and Mediacom Broadband 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 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 and financial position 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, 2015. 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, 2016. Mediacom Capital Corporation (“Mediacom Capital”), a New York corporation wholly-owned by us, co-issued, jointly and severally with us, public debt securities. Mediacom Capital 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 with a corresponding operating expense. Franchise fees reported on a gross basis amounted to $3.1 million and $3.0 million for the three months ended March 31, 2016 and 2015, respectively.
Reclassifications	Reclassifications Certain reclassifications have been made to prior year amounts to conform to the current year presentation.

FAIR VALUE (Tables)

3 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Fair Value of Interest Rate Swap Assets and Liabilities

	Fair Value as of March 31, 2016
	Level 1		Level 2		Level 3		Total
Assets
Interest rate exchange agreements	$	—	$	—	$	—	$	—
Liabilities
Interest rate exchange agreements	$	—	$	6,098	$	—	$	6,098

	Fair Value as of December 31, 2015
	Level 1		Level 2		Level 3		Total
Assets
Interest rate exchange agreements	$	—	$	1,096	$	—	$	1,096
Liabilities
Interest rate exchange agreements	$	—	$	2,497	$	—	$	2,497

PROPERTY, PLANT AND EQUIPMENT (Tables)

3 Months Ended

Mar. 31, 2016

Property Plant And Equipment [Abstract]

Components of Property, Plant and Equipment

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

	March 31,			December 31,
	2016			2015
Cable systems, equipment and customer devices	$	2,283,187		$	2,257,473
Furniture, fixtures and office equipment		43,201			44,878
Vehicles		38,910			39,531
Buildings and leasehold improvements		17,530			17,513
Land and land improvements		1,550			1,550
Property, plant and equipment, gross	$	2,384,378		$	2,360,945
Accumulated depreciation		(1,688,156	)		(1,671,048	)
Property, plant and equipment, net	$	696,222		$	689,897

ACCOUNTS PAYABLE, ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Tables)

3 Months Ended

Mar. 31, 2016

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,		December 31,
	2016		2015
Accounts payable - trade	$	22,620	$	32,722
Accrued programming costs		21,398		20,433
Accrued payroll and benefits		11,917		10,898
Accrued taxes and fees		11,474		13,138
Accrued property, plant and equipment		9,042		9,956
Advance customer payments		8,650		8,009
Accrued service costs		6,376		6,035
Bank overdrafts ⁽¹⁾		5,329		6,031
Accrued interest		4,493		9,051
Liabilities under interest rate exchange agreements		2,970		2,497
Accrued telecommunications costs		1,356		1,473
Other accrued expenses		7,534		6,167
Accounts payable, accrued expenses and other current liabilities	$	113,159	$	126,410

(1)

DEBT (Tables)

3 Months Ended

Mar. 31, 2016

Debt Disclosure [Abstract]

Summary of Outstanding Debt

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

	March 31,		December 31,
	2016		2015
Bank credit facility	$	920,000	$	920,250
7¼% senior notes due 2022		250,000		250,000
Total debt	$	1,170,000	$	1,170,250
Less: current portion		14,554		14,555
Total long-term debt, gross (less current portion)	$	1,155,446	$	1,155,695
Less: deferred financing costs, net		10,434		11,035
Total long-term debt, net (less current portion)	$	1,145,012	$	1,144,660

Fair Values of Senior Notes and Outstanding Debt under Credit Facility

	March 31,		December 31,
	2016		2015
7¼% senior notes due 2022		259,375		251,250
Total senior notes	$	259,375	$	251,250
Bank credit facility	$	917,628	$	912,944

Organization - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Amount due from affiliate by subsidiary	$ 100
Franchise fees imposed by local governmental authorities	$ 3,100,000	$ 3,000,000

Fair Value - Fair Value of Interest Rate Swap Assets and Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	$ 2,970	$ 2,497
Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets		1,096
Liabilities	6,098	2,497
Level 2 [Member] \| Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets		1,096
Liabilities	$ 6,098	$ 2,497

Fair Value - Additional Information (Detail) - USD ($)	3 Months Ended
Fair Value - Additional Information (Detail) - USD ($)	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Current liability in accounts payable, accrued expenses and other current liabilities	$ 3,000,000		$ 2,500,000
Long-term liability	3,100,000		0
Long term assets	0		1,100,000
Current assets	0		$ 0
Net gain (loss) on derivatives	$ (4,700,000)	$ 2,600,000

- 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, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,384,378	$ 2,360,945
Accumulated depreciation	(1,688,156)	(1,671,048)
Property, plant and equipment, net	696,222	689,897
Cable Systems, Equipment and Customer Devices [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,283,187	2,257,473
Furniture, Fixtures and Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	43,201	44,878
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	38,910	39,531
Buildings and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	17,530	17,513
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,550	$ 1,550

Accounts Payable, Accrued Expenses and Other Current Liabilities - Summary of Accounts Payable, Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Payables And Accruals [Abstract]
Accounts payable - trade	$ 22,620	$ 32,722
Accrued programming costs	21,398	20,433
Accrued payroll and benefits	11,917	10,898
Accrued taxes and fees	11,474	13,138
Accrued property, plant and equipment	9,042	9,956
Advance customer payments	8,650	8,009
Accrued service costs	6,376	6,035
Bank overdrafts	5,329	6,031
Accrued interest	4,493	9,051
Liabilities under interest rate exchange agreements	2,970	2,497
Accrued telecommunications costs	1,356	1,473
Other accrued expenses	7,534	6,167
Accounts payable, accrued expenses and other current liabilities	$ 113,159	$ 126,410

Debt - Summary of Outstanding Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Total debt	$ 1,170,000	$ 1,170,250
Less: current portion	14,554	14,555
Total long-term debt, gross (less current portion)	1,155,446	1,155,695
Less: deferred financing costs, net	10,434	11,035
Total long-term debt, net (less current portion)	1,145,012	1,144,660
Bank Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	920,000	920,250
7 ¼% Senior Notes Due 2022 [Member]
Debt Instrument [Line Items]
Total debt	$ 250,000	$ 250,000

Debt - Summary of Outstanding Debt (Parenthetical) (Detail) - 7 ¼% Senior Notes Due 2022 [Member]	3 Months Ended
	Mar. 31, 2016
Debt Instrument [Line Items]
Debt instrument, Interest rate	7.25%
Debt instrument, Maturity	2022

Debt - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Reclassification of deferred financing costs from other assets to long-term debt, net	$ 10.4	$ 11.0
7 ¼% Senior Notes Due 2022 [Member]
Debt Instrument [Line Items]
Outstanding senior notes	$ 250.0
Senior notes expiration date	2022-02
Debt instrument, Interest rate	7.25%
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Interest rate on borrowings	1.50%
Expiration period of revolving credit commitments	2018-12
Weighted average interest rate on outstanding borrowings	3.50%
Interest Rate Swap [Member] \| Not Designated as Hedging Instrument [Member]
Debt Instrument [Line Items]
Revolving credit commitment outstanding	$ 400.0
Maximum [Member] \| 7 ¼% Senior Notes Due 2022 [Member]
Debt Instrument [Line Items]
Required debt to operating cash flow	850.00%
Minimum [Member] \| 7 ¼% Senior Notes Due 2022 [Member]
Debt Instrument [Line Items]
Required debt to operating cash flow	100.00%
Loans Payable [Member]
Debt Instrument [Line Items]
Revolving credit commitment outstanding	$ 95.8
Letter of Credit [Member]
Debt Instrument [Line Items]
Revolving credit commitment outstanding	8.2
Bank Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit commitment outstanding	1,187.0
Unused revolving credit commitments	$ 258.5
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	$ 362.5
Expiration date of revolving credit commitments	Feb. 05, 2019
Bank Credit Facility [Member] \| Term Loan A [Member]
Debt Instrument [Line Items]
Revolving credit commitment outstanding	$ 151.6
Expiration date of revolving credit commitments	Nov. 15, 2021
Bank Credit Facility [Member] \| Term Loan E [Member]
Debt Instrument [Line Items]
Revolving credit commitment outstanding	$ 82.9
Expiration date of revolving credit commitments	Oct. 23, 2017
Bank Credit Facility [Member] \| Term Loan F [Member]
Debt Instrument [Line Items]
Revolving credit commitment outstanding	$ 245.0
Expiration date of revolving credit commitments	Mar. 31, 2018
Bank Credit Facility [Member] \| Term Loan G [Member]
Debt Instrument [Line Items]
Revolving credit commitment outstanding	$ 344.8
Expiration date of revolving credit commitments	Jun. 30, 2021

Debt - Fair Values of Senior Notes and Outstanding Debt under Credit Facility (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Total senior notes	$ 259,375	$ 251,250
7 ¼% Senior Notes Due 2022 [Member]
Debt Instrument [Line Items]
Total senior notes	259,375	251,250
Bank Credit Facility [Member]
Debt Instrument [Line Items]
Total senior notes	$ 917,628	$ 912,944

Debt - Fair Values of Senior Notes and Outstanding Debt under Credit Facility (Parenthetical) (Detail) - 7 ¼% Senior Notes Due 2022 [Member]	3 Months Ended
	Mar. 31, 2016
Debt Instrument [Line Items]
Debt instrument, Interest rate	7.25%
Debt instrument, Maturity	2022

Preferred Membership Interest in Affiliated Company - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Jul. 31, 2001
Schedule of Equity Method Investments [Line Items]
Preferred membership investment	$ 150,000		$ 150,000
Cash dividends on preferred membership interest	$ 4,500	$ 4,500
Mediacom Broadband LLC [Member]
Schedule of Equity Method Investments [Line Items]
Preferred membership investment				$ 150,000
Preferred annual cash dividend	12.00%
Cash dividends on preferred membership interest	$ 4,500	$ 4,500

Member's Equity - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Equity [Abstract]
Capital distributions to parent	$ 0	$ 5,000,000
Received capital contributions from parent	$ 0	$ 0

Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Related Party Transaction [Line Items]
Management fees charged by MCC	$ 3,650	$ 3,250
MCC [Member]
Related Party Transaction [Line Items]
Management fees charged by MCC	$ 3,700	$ 3,300
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	4.50%