Document and Entity Information	3 Months Ended
Document and Entity Information	Mar. 31, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2015
Document Fiscal Year Focus	2015
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, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
CURRENT ASSETS
Cash	$ 9,880	$ 8,720
Accounts receivable, net of allowance for doubtful accounts of $2,059 and $2,135	38,361	45,712
Accounts receivable - affiliates	3,606
Prepaid expenses and other current assets	11,282	8,142
Total current assets	63,129	62,574
Preferred membership interest in affiliated company (Note 7)	150,000	150,000
Property, plant and equipment, net of accumulated depreciation of $1,615,289 and $1,592,999	672,047	672,832
Franchise rights	614,731	614,731
Goodwill	23,911	23,911
Intangible assets, net of accumulated amortization	20	22
Other assets, net of accumulated amortization of $9,598 and $8,343	17,027	15,288
Total assets	1,540,865	1,539,358
CURRENT LIABILITIES
Accounts payable, accrued expenses and other current liabilities	126,621	130,706
Accounts payable - affiliates		1,463
Deferred revenue	28,851	28,115
Current portion of long-term debt	8,500	8,500
Total current liabilities	163,972	168,784
Long-term debt, less current portion	1,229,500	1,246,500
Other non-current liabilities	1,859	1,859
Total liabilities	1,395,331	1,417,143
Commitments and contingencies (Note 10)
MEMBER'S EQUITY
Capital contributions	468,645	473,609
Accumulated deficit	(323,111)	(351,394)
Total member's equity	145,534	122,215
Total liabilities and member's equity	$ 1,540,865	$ 1,539,358

Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 2,059	$ 2,135
Accumulated depreciation	1,615,289	1,592,999
Accumulated amortization on Intangible assets	118,281	118,279
Accumulated amortization on Other assets	$ 9,598	$ 8,343

Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Revenues	$ 180,044	$ 175,739
Costs and expenses:
Service costs (exclusive of depreciation and amortization)	80,644	76,648
Selling, general and administrative expenses	28,844	30,021
Management fee expense	3,250	3,200
Depreciation and amortization	29,894	28,731
Operating income	37,412	37,139
Interest expense, net	(15,978)	(23,902)
Gain on derivatives, net	2,578	4,316
Investment income from affiliate (Note 7)	4,500	4,500
Other expense, net	(229)	(381)
Net income	$ 28,283	$ 21,672

Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 28,283	$ 21,672
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation and amortization	29,894	28,731
Gain on derivatives, net	(2,578)	(4,316)
Amortization of deferred financing costs	722	937
Changes in assets and liabilities, net of effects from acquisitions:
Accounts receivable, net	7,351	6,238
Accounts receivable - affiliates	(3,606)	(8,266)
Prepaid expenses and other assets	(4,572)	2,173
Accounts payable, accrued expenses and other current liabilities	(1,877)	(17,851)
Accounts payable - affiliates	(1,463)	(9,628)
Deferred revenue	736	613
Other non-current liabilities		(2,975)
Net cash flows provided by operating activities	52,890	17,328
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(28,580)	(24,626)
Change in accrued property, plant and equipment	603	1,764
Proceeds from sale of assets	41
Acquisition of other intangible assets	(1,249)
Net cash flows used in investing activities	(29,185)	(22,862)
CASH FLOWS FROM FINANCING ACTIVITIES:
New borrowings of bank debt	43,000	482,000
Repayment of bank debt	(60,000)	(472,000)
Capital distributions to parent (Note 8)	(5,000)
Financing costs		(4,650)
Other financing activities	(545)	(171)
Net cash flows (used in) provided by financing activities	(22,545)	5,179
Net increase (decrease) in cash	1,160	(355)
CASH, beginning of period	8,720	9,744
CASH, end of period	9,880	9,389
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest, net of amounts capitalized	$ 19,820	$ 35,555

ORGANIZATION	3 Months Ended
ORGANIZATION	Mar. 31, 2015
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 presentation 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, 2014. 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, 2015. 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 approximately $3.0 million and $2.9 million for the three months ended March 31, 2015 and 2014, respectively.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

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RECENT ACCOUNTING PRONOUNCEMENTS	3 Months Ended
RECENT ACCOUNTING PRONOUNCEMENTS	Mar. 31, 2015
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. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. Early application is not permitted. In April 2015, the FASB proposed a deferral of the effective date by one year (effective for annual reporting periods beginning after December 15, 2017). The FASB also proposed permitting early adoption of the updated accounting guidance, but not before the original effective date of December 15, 2016. We have not completed our evaluation of this new guidance to determine its impact on our financial statements, financial disclosures and our method of adoption. In April 2015, the FASB issued ASU No. 2015-03 - 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 have not completed our evaluation of this new guidance to determine its impact on our financial statements, financial disclosures and our method of 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, 2015

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 at March 31, 2015 and December 31, 2014. 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:

•

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, 2015
	Level 1		Level 2		Level 3		Total
Assets
Interest rate exchange agreements	$	—	$	312	$	—	$	312
Liabilities
Interest rate exchange agreements	$	—	$	9,496	$	—	$	9,496


	Fair Value as of December 31, 2014
	Level 1		Level 2		Level 3		Total
Assets
Interest rate exchange agreements	$	—	$	—	$	—	$	—
Liabilities
Interest rate exchange agreements	$	—	$	11,761	$	—	$	11,761

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, 2015, we recorded a current liability in accounts payable, accrued expenses and other current liabilities of $9.5 million and a long-term asset in other assets, net, of $0.3 million. As of December 31, 2014, we recorded a current liability in accounts payable, accrued expenses and other current liabilities of $11.8 million. As of both March 31, 2015 and December 31, 2014, there was no long-term liability.

As a result of the changes in the mark-to-market valuations on our interest rate swaps, we recorded net gains on derivatives of $2.6 million and $4.3 million for the three months ended March 31, 2015 and 2014, 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.

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PROPERTY, PLANT AND EQUIPMENT

3 Months Ended

Mar. 31, 2015

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, 2015			December 31, 2014
Cable systems, equipment and customer devices	$	2,183,859		$	2,161,767
Furniture, fixtures and office equipment		47,529			47,524
Vehicles		37,216			37,831
Buildings and leasehold improvements		17,182			17,159
Land and land improvements		1,550			1,550

Property, plant and equipment, gross	$	2,287,336		$	2,265,831
Accumulated depreciation		(1,615,289	)		(1,592,999	)

Property, plant and equipment, net	$	672,047		$	672,832

- Definition

The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures.

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ACCOUNTS PAYABLE, ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES

3 Months Ended

Mar. 31, 2015

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, 2015		December 31, 2014
Accounts payable - trade	$	36,769	$	28,238
Accrued programming costs		20,599		19,966
Accrued payroll and benefits		13,698		12,090
Accrued taxes and fees		12,124		15,767
Liabilities under interest rate exchange agreements		9,496		11,761
Advance customer payments		7,424		10,922
Accrued service costs		6,088		6,685
Accrued property, plant and equipment		4,189		3,586
Bank overdrafts ⁽¹⁾		3,277		3,822
Accrued interest		2,683		7,247
Accrued telecommunications costs		1,328		1,055
Other accrued expenses		8,946		9,567

Accounts payable, accrued expenses and other current liabilities	$	126,621	$	130,706

(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, 2015

Debt Disclosure [Abstract]

DEBT

6. DEBT

As of March 31, 2015 and December 31, 2014, our debt consisted of (dollars in thousands):


	March 31, 2015		December 31, 2014
Bank credit facility	$	988,000	$	1,005,000
7¹⁄₄% senior notes due 2022		250,000		250,000

Total debt	$	1,238,000	$	1,255,000
Less: current portion		8,500		8,500

Total long-term debt	$	1,229,500	$	1,246,500

Bank Credit Facility

As of March 31, 2015, we maintained a $1.059 billion bank credit facility (the “credit facility”), comprising:

•

$225.0 million of revolving credit commitments, which expire on February 5, 2019;

•

$238.1 million of outstanding borrowings under Term Loan E, which matures on October 23, 2017;

•

$247.5 million of outstanding borrowings under Term Loan F, which matures on March 31, 2018; and

•

$348.3 million of outstanding borrowings under Term Loan G, which matures on June 30, 2021.

As of March 31, 2015, we had $62.0 million of unused revolving credit commitments, all of which were available to be borrowed and used for general corporate purposes, after giving effect to $154.1 million of outstanding loans and $8.9 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, 2015, 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, 2015, our operating subsidiaries were in compliance with all covenants under the credit agreement.

Interest Rate Swaps

We have entered into several 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, 2015 and 2014.

As of March 31, 2015, we had interest rate swaps which fixed the variable rate portion of $500 million of borrowings at 2.7%, all of which are scheduled to expire during December 2015. As of the same date, we also had forward starting interest rate swaps that will fix the variable rate portion of $200 million of borrowings at 1.5% for a three year period commencing December 2015.

As of March 31, 2015, the weighted average interest rate on outstanding borrowings under the credit facility, including the effect of our interest rate swaps, was 4.4%.

Senior Notes

As of March 31, 2015, we had $250 million of outstanding senior notes, all of which comprised our 7¹⁄₄% senior notes due February 2022 (the “7¹⁄₄% Notes”). Our senior notes are unsecured obligations, and the indenture governing the 7¹⁄₄% 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, 2015, we were in compliance with all covenants under the indenture.

Other Assets

Other assets, net, primarily include financing costs and original issue discount incurred to raise debt, which are deferred and amortized as interest expense over the expected term of such financings. Original issue discount, as recorded in other assets, net, was $2.5 million and $2.6 million as of March 31, 2015 and December 31, 2014, respectively.

Debt Ratings

MCC’s corporate credit ratings are Ba3 by Moody’s and BB- by Standard and Poor’s (“S&P”), both with stable outlooks. Our senior unsecured ratings are B2 by Moody’s and B by S&P, both with stable outlooks. There are no covenants, events of default, borrowing conditions or other terms in the credit agreement or the indenture that are based on changes in our credit rating assigned by any rating agency.

Fair Value

As of March 31, 2015 and December 31, 2014, the fair values of our senior notes and outstanding debt under the credit facility (which were calculated based upon market prices of such issuances) were as follows (dollars in thousands):


	March 31, 2015		December 31, 2014
7¹⁄₄% senior notes due 2022		270,000		268,125

Total senior notes	$	270,000	$	268,125

Bank credit facility	$	986,900	$	985,752

PREFERRED MEMBERSHIP INTEREST IN AFFILIATED COMPANY	3 Months Ended
PREFERRED MEMBERSHIP INTEREST IN AFFILIATED COMPANY	Mar. 31, 2015
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 million preferred membership investment in 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, 2015 and 2014.

- Definition

The entire disclosure for equity method investments and joint ventures. Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee. Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group.

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RELATED PARTY TRANSACTIONS	3 Months Ended
RELATED PARTY TRANSACTIONS	Mar. 31, 2015
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 $3.3 million and $3.2 million for the three months ended March 31, 2015 and 2014, 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, 2015
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.

- Definition

The entire disclosure for commitments and contingencies.

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GOODWILL AND OTHER INTANGIBLE ASSETS	3 Months Ended
GOODWILL AND OTHER INTANGIBLE ASSETS	Mar. 31, 2015
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 cable franchise rights and goodwill are indefinite-lived assets and therefore not amortizable. We last evaluated the qualitative factors surrounding our Mediacom LLC reporting unit as of October 1, 2014 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. Because we believe there has not been a meaningful change in the long-term fundamentals of our business during the first three months of 2015, we determined that there has been no triggering event under ASC 350 and, as such, no interim impairment test was required as of March 31, 2015. During the three months ended March 31, 2015, we acquired various intellectual property rights for approximately $1.2 million, which are recorded in other assets, net.

- 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.

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ORGANIZATION (Policies)	3 Months Ended
ORGANIZATION (Policies)	Mar. 31, 2015
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 presentation 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, 2014. 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, 2015. 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 approximately $3.0 million and $2.9 million for the three months ended March 31, 2015 and 2014, respectively.

FAIR VALUE (Tables)

3 Months Ended

Mar. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value of Interest Rate Swap Assets and Liabilities


	Fair Value as of March 31, 2015
	Level 1		Level 2		Level 3		Total
Assets
Interest rate exchange agreements	$	—	$	312	$	—	$	312
Liabilities
Interest rate exchange agreements	$	—	$	9,496	$	—	$	9,496


	Fair Value as of December 31, 2014
	Level 1		Level 2		Level 3		Total
Assets
Interest rate exchange agreements	$	—	$	—	$	—	$	—
Liabilities
Interest rate exchange agreements	$	—	$	11,761	$	—	$	11,761

PROPERTY, PLANT AND EQUIPMENT (Tables)

3 Months Ended

Mar. 31, 2015

Property, Plant and Equipment [Abstract]

Components of Property, Plant and Equipment

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


	March 31, 2015			December 31, 2014
Cable systems, equipment and customer devices	$	2,183,859		$	2,161,767
Furniture, fixtures and office equipment		47,529			47,524
Vehicles		37,216			37,831
Buildings and leasehold improvements		17,182			17,159
Land and land improvements		1,550			1,550

Property, plant and equipment, gross	$	2,287,336		$	2,265,831
Accumulated depreciation		(1,615,289	)		(1,592,999	)

Property, plant and equipment, net	$	672,047		$	672,832

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

3 Months Ended

Mar. 31, 2015

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, 2015		December 31, 2014
Accounts payable - trade	$	36,769	$	28,238
Accrued programming costs		20,599		19,966
Accrued payroll and benefits		13,698		12,090
Accrued taxes and fees		12,124		15,767
Liabilities under interest rate exchange agreements		9,496		11,761
Advance customer payments		7,424		10,922
Accrued service costs		6,088		6,685
Accrued property, plant and equipment		4,189		3,586
Bank overdrafts ⁽¹⁾		3,277		3,822
Accrued interest		2,683		7,247
Accrued telecommunications costs		1,328		1,055
Other accrued expenses		8,946		9,567

Accounts payable, accrued expenses and other current liabilities	$	126,621	$	130,706

(1)

DEBT (Tables)

3 Months Ended

Mar. 31, 2015

Debt Disclosure [Abstract]

Summary of Debt

As of March 31, 2015 and December 31, 2014, our debt consisted of (dollars in thousands):


	March 31, 2015		December 31, 2014
Bank credit facility	$	988,000	$	1,005,000
7¹⁄₄% senior notes due 2022		250,000		250,000

Total debt	$	1,238,000	$	1,255,000
Less: current portion		8,500		8,500

Total long-term debt	$	1,229,500	$	1,246,500

Fair Values of Senior Notes and Outstanding Debt


	March 31, 2015		December 31, 2014
7¹⁄₄% senior notes due 2022		270,000		268,125

Total senior notes	$	270,000	$	268,125

Bank credit facility	$	986,900	$	985,752

Organization - Additional Information (Detail) (USD $)	3 Months Ended
Organization - Additional Information (Detail) (USD $)	Mar. 31, 2015	Mar. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Amount due from affiliate by subsidiary	$ 100
Franchise fees imposed by local governmental authorities	$ 3,000,000	$ 2,900,000

- 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+ Details

Fair Value - Fair Value of Interest Rate Swap Assets and Liabilities (Detail) (Interest Rate Swap [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	$ 312
Liabilities	9,496	11,761
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	312
Liabilities	$ 9,496	$ 11,761

Fair Value - Additional Information (Detail) (USD $)	3 Months Ended
Fair Value - Additional Information (Detail) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Accumulated current liability in accounts payable, accrued expenses and other current liabilities	$ 9,500,000		$ 11,800,000
Accumulated long-term asset in other assets, net	300,000
Accumulated long-term liability	0		0
Net gains on derivatives	$ 2,600,000	$ 4,300,000

- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other 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 after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details

- 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

- 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 after one year or the 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, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,287,336	$ 2,265,831
Accumulated depreciation	(1,615,289)	(1,592,999)
Property, plant and equipment, net	672,047	672,832
Cable Systems, Equipment and Customer Devices [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,183,859	2,161,767
Furniture, Fixtures and Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	47,529	47,524
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	37,216	37,831
Buildings and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	17,182	17,159
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, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Accounts payable - trade	$ 36,769	$ 28,238
Accrued programming costs	20,599	19,966
Accrued payroll and benefits	13,698	12,090
Accrued taxes and fees	12,124	15,767
Liabilities under interest rate exchange agreements	9,496	11,761
Advance customer payments	7,424	10,922
Accrued service costs	6,088	6,685
Accrued property, plant and equipment	4,189	3,586
Bank overdrafts	3,277	3,822
Accrued interest	2,683	7,247
Accrued telecommunications costs	1,328	1,055
Other accrued expenses	8,946	9,567
Accounts payable, accrued expenses and other current liabilities	$ 126,621	$ 130,706

Debt - Summary of Debt (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Total debt	$ 1,238,000	$ 1,255,000
Total debt	1,238,000	1,255,000
Less: current portion	8,500	8,500
Total long-term debt	1,229,500	1,246,500
7 1/4% Senior Notes Due 2022 [Member]
Debt Instrument [Line Items]
Total debt	250,000	250,000
Total debt	250,000	250,000
Bank Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	988,000	1,005,000
Total debt	$ 988,000	$ 1,005,000

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References+ Details

Debt - Summary of Debt (Parenthetical) (Detail) (7 1/4% Senior Notes Due 2022 [Member])	3 Months Ended
	Mar. 31, 2015
7 1/4% Senior Notes Due 2022 [Member]
Debt Instrument [Line Items]
Debt instrument, Interest rate	7.25%
Debt instrument, Maturity	2022

Debt - Additional Information (Detail) (USD $) In Millions, unless otherwise specified					3 Months Ended			3 Months Ended						3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2015 Loans Payable [Member]	Mar. 31, 2015 Forward Interest Rate Swaps [Member]	Mar. 31, 2015 7 1/4% Senior Notes Due 2022 [Member]	Mar. 31, 2015 7 1/4% Senior Notes Due 2022 [Member] Maximum [Member]	Mar. 31, 2015 7 1/4% Senior Notes Due 2022 [Member] Minimum [Member]	Mar. 31, 2015 Interest Rate Swap [Member]	Mar. 31, 2015 Interest Rate Swap [Member] Not Designated as Hedging Instrument [Member]	Mar. 31, 2015 Letter of Credit [Member]	Mar. 31, 2015 Bank Credit Facility [Member]	Mar. 31, 2015 Bank Credit Facility [Member] Maximum [Member]	Mar. 31, 2015 Bank Credit Facility [Member] Minimum [Member]	Mar. 31, 2015 Bank Credit Facility [Member] Term Loan E [Member]	Mar. 31, 2015 Bank Credit Facility [Member] Term Loan F [Member]	Mar. 31, 2015 Bank Credit Facility [Member] Term Loan G [Member]	Mar. 31, 2015 Bank Credit Facility [Member] Revolving Credit Commitments at Present [Member]
Debt Instrument [Line Items]
Revolving credit commitment outstanding			$ 154.1	$ 200.0					$ 500.0	$ 8.9	$ 1,059.0			$ 238.1	$ 247.5	$ 348.3
Revolving credit commitments																	225.0
Expiration date of revolving credit commitments														Oct. 23, 2017	Mar. 31, 2018	Jun. 30, 2021	Feb. 05, 2019
Unused revolving credit commitments											62.0
Leverage ratio												500.00%	100.00%
Interest coverage ratio												200.00%	100.00%
Interest rate on borrowings				1.50%				2.70%
Expiration date of revolving credit commitments								2015-12
Average interest rate on outstanding borrowings								4.40%
Outstanding senior notes					250
Senior notes expiration date					February 2022
Required debt to operating cash flow						850.00%	100.00%
Original issue discount, as recorded in other assets, net	$ 2.5	$ 2.6

Debt - Fair Values of Senior Notes and Outstanding Debt (Parenthetical) (Detail) (7 1/4% Senior Notes Due 2022 [Member])	3 Months Ended
	Mar. 31, 2015
7 1/4% Senior Notes Due 2022 [Member]
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, unless otherwise specified	3 Months Ended			3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Mar. 31, 2015 Mediacom Broadband LLC [Member]	Mar. 31, 2014 Mediacom Broadband LLC [Member]	Jul. 31, 2001 Mediacom Broadband LLC [Member]
Schedule of Equity Method Investments [Line Items]
Preferred membership investment	$ 150,000		$ 150,000			$ 150,000
Preferred annual cash dividend				12.00%
Cash dividends on preferred membership interest	$ 4,500	$ 4,500		$ 4,500	$ 4,500

Related Party Transactions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Related Party Transaction [Line Items]
Management fees charged by MCC	$ 3,250	$ 3,200
MCC [Member] \| Service [Member]
Related Party Transaction [Line Items]
Management fees charged by MCC	$ 3,300	$ 3,200
MCC [Member] \| Service [Member] \| Maximum [Member] \| Operating Revenues [Member] \| Management Agreement Concentration Risk [Member]
Related Party Transaction [Line Items]
Rate of annual gross operating revenues of our operating subsidiaries	4.50%

Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Intellectual property rights acquired	$ 1,249

MEMBER'S DEFICIT	3 Months Ended
MEMBER'S DEFICIT	Mar. 31, 2015
Equity [Abstract]
MEMBER'S DEFICIT	8. MEMBER’S DEFICIT 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 capital distributions to parent in cash of $5.0 million during the three months ended March 31, 2015.

Debt - Fair Values of Senior Notes and Outstanding Debt (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Total senior notes	$ 270,000	$ 268,125
Bank Credit Facility [Member]
Debt Instrument [Line Items]
Total senior notes	986,900	985,752
7 1/4% Senior Notes Due 2022 [Member]
Debt Instrument [Line Items]
Total senior notes	$ 270,000	$ 268,125

Member's Deficit - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Capital distributions to parent	$ 5,000