Document and Entity Information	3 Months Ended
Document and Entity Information	Mar. 31, 2014
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2014
Document Fiscal Year Focus	2014
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, 2014	Dec. 31, 2013
CURRENT ASSETS
Cash	$ 9,389	$ 9,744
Accounts receivable, net of allowance for doubtful accounts of $2,026 and $2,010	46,977	53,215
Accounts receivable - affiliates	8,266
Prepaid expenses and other current assets	10,295	9,485
Total current assets	74,927	72,444
Preferred membership interest in affiliated company (Note 7)	150,000	150,000
Property, plant and equipment, net of accumulated depreciation of $1,522,125 and $1,499,404	665,031	669,159
Franchise rights	614,731	614,731
Goodwill	23,910	23,911
Subscriber lists, net of accumulated amortization of $118,273 and $118,271	29	31
Other assets, net of accumulated amortization of $12,490 and $11,553	19,394	15,662
Total assets	1,548,022	1,545,938
CURRENT LIABILITIES
Accounts payable, accrued expenses and other current liabilities	131,403	149,058
Accounts payable - affiliates		9,628
Deferred revenue	28,319	27,706
Current portion of long-term debt	208,989	15,250
Total current liabilities	368,711	201,642
Long-term debt, less current portion	1,253,011	1,436,750
Other non-current liabilities	9,864	12,839
Total liabilities	1,631,586	1,651,231
Commitments and contingencies (Note 10)
MEMBER'S DEFICIT
Capital contributions	321,377	321,320
Accumulated deficit	(404,941)	(426,613)
Total member's deficit	(83,564)	(105,293)
Total liabilities and member's deficit	$ 1,548,022	$ 1,545,938

Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 2,026	$ 2,010
Accumulated depreciation	1,522,125	1,499,404
Accumulated amortization on Subscriber lists	118,273	118,271
Accumulated amortization on Other assets	$ 12,490	$ 11,553

Consolidated Statements of Operations (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
Revenues	$ 175,739	$ 171,019
Costs and expenses:
Service costs (exclusive of depreciation and amortization)	76,648	76,122
Selling, general and administrative expenses	30,021	27,932
Management fee expense	3,200	3,000
Depreciation and amortization	28,731	28,316
Operating income	37,139	35,649
Interest expense, net	(23,902)	(23,615)
Gain on derivatives, net	4,316	4,680
Investment income from affiliate	4,500	4,500
Other expense, net	(381)	(422)
Net income	$ 21,672	$ 20,792

Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 21,672	$ 20,792
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation and amortization	28,731	28,316
Gain on derivatives, net	(4,316)	(4,680)
Amortization of deferred financing costs	937	805
Changes in assets and liabilities, net of effects from acquisitions:
Accounts receivable, net	6,238	(1,032)
Accounts receivable - affiliates	(8,266)	(389)
Prepaid expenses and other assets	2,173	(3,886)
Accounts payable, accrued expenses and other current liabilities	(17,851)	(12,940)
Accounts payable - affiliates	(9,628)
Deferred revenue	613	2,266
Other non-current liabilities	(2,975)	194
Net cash flows provided by operating activities	17,328	29,446
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(24,626)	(28,754)
Change in accrued property, plant and equipment	1,764	(676)
Net cash flows used in investing activities	(22,862)	(29,430)
CASH FLOWS FROM FINANCING ACTIVITIES:
New borrowings of bank debt	482,000	62,000
Repayment of bank debt	(472,000)	(62,000)
Capital distributions to parent (Note 8)		(3,800)
Financing costs	(4,650)
Other financing activities	(171)	931
Net cash flows provided by (used in) financing activities	5,179	(2,869)
Net decrease in cash	(355)	(2,853)
CASH, beginning of period	9,744	9,394
CASH, end of period	9,389	6,541
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest, net of amounts capitalized	$ 35,555	$ 34,242

Organization	3 Months Ended
Organization	Mar. 31, 2014
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, 2013. 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, 2014. 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 $2.9 million and $3.0 million for the three months ended March 31, 2014 and 2013, respectively. *Reclassifications* Certain reclassifications have been made to prior year amounts to conform to the current year presentation.

- Definition

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

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+ Details

Recent Accounting Pronouncements	3 Months Ended
Recent Accounting Pronouncements	Mar. 31, 2014
Accounting Changes And Error Corrections [Abstract]
Recent Accounting Pronouncements	2. RECENT ACCOUNTING PRONOUNCEMENTS In December 2013, the FASB issued Accounting Standards Update No. 2013-12 (“ASU 2013-12”) Definition of a Public Business Entity. ASU 2013-12 defines a public business entity to be used in considering the scope of new financial guidance and identifies whether the guidance does or does not apply to public business entities. The Accounting Standards Codification includes multiple definitions of the terms nonpublic entity and public entity. ASU 2013-12 states that an entity that is required by the SEC to file or furnish financial statements with the SEC, or does file or furnish financial statements with the SEC, is considered a public business entity. There is no effective date for ASU 2013-12. We adopted ASU 2013-12 as of December 31, 2013. We are deemed to be a public entity according to this guidance.

- 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, 2014

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, 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 ASC 820, 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.

As of March 31, 2014, our interest rate swap liabilities, net, were valued at $25.7 million using Level 2 inputs, as follows (dollars in thousands):


	Fair Value as of March 31, 2014
	Level 1		Level 2		Level 3		Total
Assets
Interest rate exchange agreements	$	—	$	—	$	—	$	—
Liabilities
Interest rate exchange agreements	$	—	$	25,673	$	—	$	25,673

Interest rate exchange agreements - liabilities, net	$	—	$	25,673	$	—	$	25,673

As of December 31, 2013, our interest rate swap agreement liabilities, net, were valued at $30.0 million using Level 2 inputs, as follows (dollars in thousands):


	Fair Value as of December 31, 2013
	Level 1		Level 2		Level 3		Total
Assets
Interest rate exchange agreements	$	—	$	—	$	—	$	—
Liabilities
Interest rate exchange agreements	$	—	$	29,989	$	—	$	29,989

Interest rate exchange agreements - liabilities, net	$	—	$	29,989	$	—	$	29,989

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.

All of our interest rate swaps were in a liability position as of each of March 31, 2014 and December 31, 2013, based upon their mark-to-market valuation, and therefore no assets were recorded on our consolidated balance sheets. As of March 31, 2014, we recorded a current liability in accounts payable, accrued expenses and other current liabilities of $18.0 million and a long-term liability in other non-current liabilities of $7.7 million. As of December 31, 2013, we recorded a current liability in accounts payable, accrued expenses and other current liabilities of $19.4 million and a long-term liability in other non-current liabilities of $10.6 million.

As a result of the changes in the mark-to-market valuations on these interest rate swaps, we recorded a net gain on derivatives of $4.3 million and $4.7 million for the three months ended March 31, 2014 and 2013, 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, 2014

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,
	2014			2013
Cable systems, equipment and customer devices	$	2,081,718		$	2,059,980
Furniture, fixtures and office equipment		50,242			52,157
Vehicles		36,708			37,938
Buildings and leasehold improvements		16,907			16,907
Land and land improvements		1,581			1,581

Property, plant and equipment, gross	$	2,187,156			2,168,563
Accumulated depreciation		(1,522,125	)		(1,499,404	)

Property, plant and equipment, net	$	665,031		$	669,159

- 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.

+ References+ Details

Accounts Payable, Accrued Expenses and Other Current Liabilities

3 Months Ended

Mar. 31, 2014

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,
	2014		2013
Accounts payable - trade	$	21,983	$	24,282
Accrued programming costs		19,506		19,927
Liabilities under interest rate exchange agreements		18,013		19,354
Accrued taxes and fees		13,754		16,115
Accrued payroll and benefits		12,692		14,271
Advance customer payments		12,121		10,678
Accrued service costs		7,999		8,200
Accrued interest		7,104		19,694
Accrued property, plant and equipment		5,687		3,923
Bank overdrafts ⁽¹⁾		2,640		2,866
Accrued telecommunications costs		1,129		1,368
Other accrued expenses		8,775		8,380

Accounts payable, accrued expenses and other current liabilities	$	131,403	$	149,058

(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, 2014

Debt Disclosure [Abstract]

Debt

6. DEBT

As of March 31, 2014 and December 31, 2013, our debt consisted of (dollars in thousands):


	March 31,		December 31,
	2014		2013
Bank credit facility	$	862,000	$	852,000
9¹⁄₈% senior notes due 2019		350,000		350,000
7¹⁄₄% senior notes due 2022		250,000		250,000

Total debt	$	1,462,000	$	1,452,000
Less: current portion		208,989		15,250

Total long-term debt	$	1,253,011	$	1,436,750

Bank Credit Facility

As of March 31, 2014, we maintained a $919.6 million bank credit facility (the “credit facility”), comprising:

•

$225.0 million of revolving credit commitments, which expire on February 5, 2019 (or October 31, 2014 if $200.0 million or more remains outstanding under Term Loan C on such date);

•

$204.0 million of outstanding Term Loan C borrowings, which mature on January 31, 2015;

•

$240.6 million of outstanding Term Loan E borrowings, which mature on October 23, 2017; and

•

$250.0 million of outstanding Term Loan F borrowings, which mature on March 31, 2018

As of March 31, 2014, we had $48.1 million of unused revolving credit commitments, all of which were available to be borrowed and used for general corporate purposes, after giving effect to $167.4 million of outstanding loans and $9.5 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, 2014, the credit agreement governing the credit facility (the “credit agreement”) required us 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, 2014, we were in compliance with all covenants under the credit agreement.

On February 5, 2014, we repaid $400.0 million under Term Loan C with proceeds from the issuance of a new term loan and borrowings under our revolving credit commitments (see “New Financings” below). Repayment of the $204.0 million remaining outstanding principal amount of Term Loan C on, or prior to, its scheduled maturity of January 31, 2015 depends on our ability to access the debt markets to refinance such loans. If we are unable to obtain financing to refinance the remaining principal amount outstanding under Term Loan C, we would need to take other actions, including selling assets or seeking strategic investments from third parties, and deferring capital expenditures or other discretionary uses of cash. A failure to complete such scheduled debt repayment would permit the lenders in the credit facility to accelerate all obligations thereunder, and would also trigger a cross-default under the indentures governing our senior notes (the “indentures”), which could result in most, or all, of our debt becoming due and payable.

New Financings

On February 5, 2014, we entered into an amended and restated credit agreement that provided for a new $225.0 million revolving credit facility (the “new revolver”) and a new term loan in the aggregate principal amount of $250.0 million (“Term Loan F”). The credit agreement also amended a number of terms and conditions, including covenants relating to restricted payments, excess cash recapture, asset sales and acquisitions, and replaced the existing credit agreement in its entirety. On the same date, we borrowed the full amount under Term Loan F, the new revolver became effective, and the previous $225.2 million revolving credit facility (the “old revolver”) was terminated. After giving effect to $4.7 million of financing costs, net proceeds of $245.3 million under Term Loan F, together with $161.0 million of borrowings under the new revolver, were used to repay $400.0 million of the principal amount outstanding under the existing Term Loan C and the entire $6.3 million balance under the old revolver.

Borrowings under Term Loan F bear interest at a floating rate or rates equal to, at our discretion, LIBOR plus a margin of 2.50% or the Prime Rate plus a margin of 1.50%. Term Loan F matures on March 31, 2018 and, commencing on June 30, 2014, is subject to quarterly principal reductions of $0.6 million, representing 0.25% of the original principal amount, with a final payment at maturity of $240.6 million, representing 96.25% of the original principal amount.

Borrowings under the new revolver bear interest at a floating rate or rates equal to, at our discretion, LIBOR plus a margin ranging from 2.00% to 2.75% or the Prime Rate plus a margin ranging from of 1.00% to 1.75%. Commitment fees on the unused portion of the new revolver are payable at a rate of 0.38% or 0.50%. The applicable margin and commitment fees charged are determined by certain financial ratios pursuant to the credit agreement. The new revolver is scheduled to expire on February 5, 2019 (or October 31, 2014 if $200.0 million or more remains outstanding under Term Loan C on such date).

Interest Rate Swaps

We have entered into several interest rate swaps with various banks to fix the variable rate of borrowings 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, 2014 and 2013.

As of March 31, 2014, we had interest rate swaps that fixed the variable rate of $700 million of borrowings at a rate of 3.0%, of which $400 million and $300 million expire during the years ending December 31, 2014 and 2015, respectively. As of the same date, we also had forward starting interest rate swaps that will fix the variable rate of $200 million of borrowings at a rate of 3.0% for a one year period commencing December 2014.

As of March 31, 2014, the weighted average interest rate on outstanding borrowings under the credit facility, including the effect of our interest rate swaps, was 5.1%.

Senior Notes

As of March 31, 2014, we had $600 million of outstanding senior notes, comprising $350 million of 9¹/₈% senior notes due August 2019 and $250 million of 7¹/₄% senior notes due February 2022. Our senior notes are unsecured obligations, and the indentures limit 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, 2014, we were in compliance with covenants under the indentures.

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 $5.7 million and $5.3 million as of March 31, 2014 and December 31, 2013, respectively.

Debt Ratings

MCC’s corporate credit rating is B1 by Moody’s, with a positive outlook, and BB- by Standard and Poor’s (“S&P”), with a stable outlook. Our senior unsecured rating is B3 by Moody’s, with a positive outlook, and B by S&P, with a stable outlook. There are no covenants, events of default, borrowing conditions or other terms in the credit agreement or indentures that are based on changes in our credit rating assigned by any rating agency.

Fair Value

As of March 31, 2014 and December 31, 2013, the fair values of our senior notes and outstanding debt under the credit facility (which were calculated based upon market prices of such issuances in an active market when available) were as follows (dollars in thousands):


	March 31,		December 31,
	2014		2013
9¹⁄₈% senior notes due 2019	$	374,938	$	380,188
7¹⁄₄% senior notes due 2022		271,875		266,250

Total senior notes	$	646,813	$	646,438

Bank credit facility	$	861,977	$	850,336

Preferred Membership Interest in Affiliated Company	3 Months Ended
Preferred Membership Interest in Affiliated Company	Mar. 31, 2014
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, 2014 and 2013.

- 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, 2014
Related Party Transactions [Abstract]
Related Party Transactions	9. RELATED PARTY TRANSACTIONS MCC manages us pursuant to a management agreement 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 $3.2 million and $3.0 million for the three months ended March 31, 2014 and 2013, 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, 2014
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.

+ References+ Details

Goodwill and Other Intangible Assets	3 Months Ended
Goodwill and Other Intangible Assets	Mar. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	11. GOODWILL AND OTHER INTANGIBLE ASSETS In accordance with ASC 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 have evaluated the qualitative factors surrounding our Mediacom LLC reporting unit as of October 1, 2013, which has negative equity carrying value, and do not believe that it is “more likely than not” that a goodwill impairment exists. As such, we have not performed 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 2014, 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, 2014.

- 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, 2014
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, 2013. 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, 2014. 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 $2.9 million and $3.0 million for the three months ended March 31, 2014 and 2013, 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, 2014

Fair Value Disclosures [Abstract]

Fair Value of Interest Rate Swap Agreement Liabilities

As of March 31, 2014, our interest rate swap liabilities, net, were valued at $25.7 million using Level 2 inputs, as follows (dollars in thousands):


	Fair Value as of March 31, 2014
	Level 1		Level 2		Level 3		Total
Assets
Interest rate exchange agreements	$	—	$	—	$	—	$	—
Liabilities
Interest rate exchange agreements	$	—	$	25,673	$	—	$	25,673

Interest rate exchange agreements - liabilities, net	$	—	$	25,673	$	—	$	25,673

As of December 31, 2013, our interest rate swap agreement liabilities, net, were valued at $30.0 million using Level 2 inputs, as follows (dollars in thousands):


	Fair Value as of December 31, 2013
	Level 1		Level 2		Level 3		Total
Assets
Interest rate exchange agreements	$	—	$	—	$	—	$	—
Liabilities
Interest rate exchange agreements	$	—	$	29,989	$	—	$	29,989

Interest rate exchange agreements - liabilities, net	$	—	$	29,989	$	—	$	29,989

Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 2014

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,
	2014			2013
Cable systems, equipment and customer devices	$	2,081,718		$	2,059,980
Furniture, fixtures and office equipment		50,242			52,157
Vehicles		36,708			37,938
Buildings and leasehold improvements		16,907			16,907
Land and land improvements		1,581			1,581

Property, plant and equipment, gross	$	2,187,156			2,168,563
Accumulated depreciation		(1,522,125	)		(1,499,404	)

Property, plant and equipment, net	$	665,031		$	669,159

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

3 Months Ended

Mar. 31, 2014

Payables And Accruals [Abstract]

Table 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,
	2014		2013
Accounts payable - trade	$	21,983	$	24,282
Accrued programming costs		19,506		19,927
Liabilities under interest rate exchange agreements		18,013		19,354
Accrued taxes and fees		13,754		16,115
Accrued payroll and benefits		12,692		14,271
Advance customer payments		12,121		10,678
Accrued service costs		7,999		8,200
Accrued interest		7,104		19,694
Accrued property, plant and equipment		5,687		3,923
Bank overdrafts ⁽¹⁾		2,640		2,866
Accrued telecommunications costs		1,129		1,368
Other accrued expenses		8,775		8,380

Accounts payable, accrued expenses and other current liabilities	$	131,403	$	149,058

(1)

Debt (Tables)

3 Months Ended

Mar. 31, 2014

Debt Disclosure [Abstract]

Summary of Debt

As of March 31, 2014 and December 31, 2013, our debt consisted of (dollars in thousands):


	March 31,		December 31,
	2014		2013
Bank credit facility	$	862,000	$	852,000
9¹⁄₈% senior notes due 2019		350,000		350,000
7¹⁄₄% senior notes due 2022		250,000		250,000

Total debt	$	1,462,000	$	1,452,000
Less: current portion		208,989		15,250

Total long-term debt	$	1,253,011	$	1,436,750

Fair Values of Senior Notes and Outstanding Debt


	March 31,		December 31,
	2014		2013
9¹⁄₈% senior notes due 2019	$	374,938	$	380,188
7¹⁄₄% senior notes due 2022		271,875		266,250

Total senior notes	$	646,813	$	646,438

Bank credit facility	$	861,977	$	850,336

Organization - Additional Information (Detail) (USD $)	3 Months Ended
Organization - Additional Information (Detail) (USD $)	Mar. 31, 2014	Mar. 31, 2013
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Amount due from affiliate by subsidiary	$ 100
Franchise fees imposed by local governmental authorities	$ 2,900,000	$ 3,000,000

- Definition

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

+ References+ Details

Fair Value - Additional Information (Detail) (USD $)	3 Months Ended
Fair Value - Additional Information (Detail) (USD $)	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accumulated current liability in accounts payable, accrued expenses and other current liabilities	$ 18,000,000		$ 19,400,000
Accumulated long-term liability in other non-current liabilities	7,700,000		10,600,000
Net gain on derivatives	4,300,000	4,700,000
Interest Rate Exchange Agreements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities, net	25,673,000		29,989,000
Level 2 [Member] \| Interest Rate Exchange Agreements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities, net	$ 25,673,000		$ 29,989,000

- 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

- 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

Fair Value - Fair Value of Interest Rate Swap Agreement Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	$ 18,013	$ 19,354
Interest Rate Exchange Agreements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets
Liabilities	25,673	29,989
Liabilities, net	25,673	29,989
Level 1 [Member] \| Interest Rate Exchange Agreements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets
Liabilities
Liabilities, net
Level 2 [Member] \| Interest Rate Exchange Agreements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets
Liabilities	25,673	29,989
Liabilities, net	25,673	29,989
Level 3 [Member] \| Interest Rate Exchange Agreements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets
Liabilities
Liabilities, net

- 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. 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, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,187,156	$ 2,168,563
Accumulated depreciation	(1,522,125)	(1,499,404)
Property, plant and equipment, net	665,031	669,159
Cable Systems, Equipment and Customer Devices [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,081,718	2,059,980
Furniture, Fixtures and Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	50,242	52,157
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	36,708	37,938
Buildings and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	16,907	16,907
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,581	$ 1,581

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, 2014	Dec. 31, 2013
Payables And Accruals [Abstract]
Accounts payable - trade	$ 21,983	$ 24,282
Accrued programming costs	19,506	19,927
Liabilities under interest rate exchange agreements	18,013	19,354
Accrued taxes and fees	13,754	16,115
Accrued payroll and benefits	12,692	14,271
Advance customer payments	12,121	10,678
Accrued service costs	7,999	8,200
Accrued interest	7,104	19,694
Accrued property, plant and equipment	5,687	3,923
Bank overdrafts	2,640	2,866
Accrued telecommunications costs	1,129	1,368
Other accrued expenses	8,775	8,380
Accounts payable, accrued expenses and other current liabilities	$ 131,403	$ 149,058

Debt - Summary of Debt (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Line of Credit Facility [Line Items]
Total debt	$ 1,462,000	$ 1,452,000
Less: current portion	208,989	15,250
Total long-term debt	1,253,011	1,436,750
Bank Credit Facility [Member]
Line of Credit Facility [Line Items]
Total debt	862,000	852,000
9 1/8% Senior Notes Due 2019 [Member]
Line of Credit Facility [Line Items]
Total debt	350,000	350,000
7 1/4% Senior Notes Due 2022 [Member]
Line of Credit Facility [Line Items]
Total debt	$ 250,000	$ 250,000

- 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 - Additional Information (Detail) (USD $)	3 Months Ended				3 Months Ended									0 Months Ended			0 Months Ended	3 Months Ended			0 Months Ended	3 Months Ended		0 Months Ended				3 Months Ended			3 Months Ended					3 Months Ended
Debt - Additional Information (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Loans Payable [Member]	Mar. 31, 2014 Forward Interest Rate Swaps [Member]	Mar. 31, 2014 Minimum [Member] LIBOR [Member]	Mar. 31, 2014 Minimum [Member] Prime Rate [Member]	Mar. 31, 2014 Maximum [Member] LIBOR [Member]	Mar. 31, 2014 Maximum [Member] Prime Rate [Member]	Mar. 31, 2014 Interest Rate Exchange Agreements [Member]	Mar. 31, 2014 Interest Rate Exchange Agreements [Member] December 31, 2014 [Member]	Mar. 31, 2014 Interest Rate Exchange Agreements [Member] December 31, 2015 [Member]	Mar. 31, 2014 Interest Rate Exchange Agreements [Member] Not Designated as Hedging Instrument [Member]	Mar. 31, 2014 Letter of Credit [Member]	Feb. 05, 2014 Term Loan C [Member]	Feb. 05, 2014 Term Loan C [Member] Forecast [Member]	Mar. 31, 2014 Term Loan C [Member] Minimum [Member] October 31, 2014 [Member]	Feb. 05, 2014 Term Loan F [Member]	Mar. 31, 2014 Term Loan F [Member]	Mar. 31, 2014 Term Loan F [Member] LIBOR [Member]	Mar. 31, 2014 Term Loan F [Member] Prime Rate [Member]	Feb. 05, 2014 New Revolver [Member]	Mar. 31, 2014 New Revolver [Member] Minimum [Member]	Mar. 31, 2014 New Revolver [Member] Maximum [Member]	Feb. 05, 2014 Old Revolver [Member]	Mar. 31, 2014 Bank Credit Facility [Member]	Mar. 31, 2014 Bank Credit Facility [Member] Minimum [Member]	Mar. 31, 2014 Bank Credit Facility [Member] Maximum [Member]	Mar. 31, 2014 Bank Credit Facility [Member] Revolving Credit Commitments at Present [Member]	Mar. 31, 2014 Bank Credit Facility [Member] Term Loan C [Member]	Mar. 31, 2014 Bank Credit Facility [Member] Term Loan C [Member] Minimum [Member]	Mar. 31, 2014 Bank Credit Facility [Member] Term Loan E [Member]	Mar. 31, 2014 Bank Credit Facility [Member] Term Loan F [Member]	Mar. 31, 2014 7 1/4% Senior Notes Due 2022 [Member]	Mar. 31, 2014 7 1/4% Senior Notes Due 2022 [Member] Minimum [Member]	Mar. 31, 2014 7 1/4% Senior Notes Due 2022 [Member] Maximum [Member]	Mar. 31, 2014 9 1/8% Senior Notes Due 2019 [Member]	Mar. 31, 2014 9 1/8% Senior Notes Due 2019 [Member] Minimum [Member]	Mar. 31, 2014 9 1/8% Senior Notes Due 2019 [Member] Maximum [Member]
Line of Credit Facility [Line Items]
Revolving credit commitment outstanding			$ 167,400,000	$ 200,000,000									$ 9,500,000			$ 200,000,000	$ 400,000,000								$ 919,600,000				$ 204,000,000	$ 200,000,000	$ 240,600,000	$ 250,000,000
Revolving credit commitments															400,000,000						225,000,000			225,200,000				225,000,000
Expiration date of revolving credit commitments																												Feb. 05, 2019	Jan. 31, 2015		Oct. 23, 2017	Mar. 31, 2018
Unused revolving credit commitments																									48,100,000
Leverage ratio																										1.0	5.0
Interest coverage ratio																										1.0	2.0
Repayment of debt														245,300,000	204,000,000									161,000,000
Original principal amount																	250,000,000
Net proceeds from Term Loan																					4,700,000
Financing costs	4,650,000																6,300,000
Floating rate margin					2.00%	1.00%	2.75%	1.75%											2.50%	1.50%
Final maturity date	Mar. 31, 2018
Quarterly reductions of original principal amount																		600,000
Rate of Quarterly reductions of original principal amount																		0.25%
Final payment at maturity representing the original principal amount																		240,600,000
Rate of Final payment at maturity representing the original principal amount																		96.25%
Percentage of commitment fees																						0.38%	0.50%
Revolving credit commitment outstanding												700,000,000
Interest rate on borrowings				3.00%					3.00%
Interest rate swaps principal expiration scheduled amount										400,000,000	300,000,000
Average interest rate on outstanding borrowings									5.10%
Outstanding senior notes	600,000,000																																350,000,000			250,000,000
Senior notes expiration date																																	August 2019			February 2022
Required debt to operating cash flow																																		1.0	8.5		1.0	8.5
Original issue discount, as recorded in other assets, net	$ 5,700,000	$ 5,300,000

Debt - Fair Values of Senior Notes and Outstanding Debt (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Line of Credit Facility [Line Items]
Total senior notes	$ 646,813	$ 646,438
9 1/8% Senior Notes Due 2019 [Member]
Line of Credit Facility [Line Items]
Total senior notes	374,938	380,188
7 1/4% Senior Notes Due 2022 [Member]
Line of Credit Facility [Line Items]
Total senior notes	271,875	266,250
Bank Credit Facility [Member]
Line of Credit Facility [Line Items]
Total senior notes	$ 861,977	$ 850,336

Preferred Membership Interest in Affiliated Company - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Jul. 31, 2001
Equity Method Investments And Joint Ventures [Abstract]
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

Related Party Transactions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Related Party Transaction [Line Items]
Management fees charged by MCC	$ 3,200	$ 3,000
MCC [Member] \| Service [Member] \| Maximum [Member] \| Annual Gross Operating Revenues [Member]
Related Party Transaction [Line Items]
Compensation percentage for performance of services taken from gross operating revenues	4.50%

Member's Deficit	3 Months Ended
Member's Deficit	Mar. 31, 2014
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 $3.8 million during the three months ended March 31, 2013.

Member's Deficit - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Equity [Abstract]
Capital distributions to parent	$ 3,800