Document and Entity Information	9 Months Ended
Document and Entity Information	Sep. 30, 2013
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3
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	Sep. 30, 2013	Dec. 31, 2012
CURRENT ASSETS
Cash	$ 7,643	$ 9,394
Accounts receivable, net of allowance for doubtful accounts of $1,488 and $1,882	46,909	45,714
Accounts receivable-affiliates	7,087
Prepaid expenses and other current assets	11,785	9,176
Total current assets	73,424	64,284
Preferred membership interest in affiliated company (Note 7)	150,000	150,000
Property, plant and equipment, net of accumulated depreciation of $1,473,190 and $1,399,778	672,753	663,492
Franchise rights	614,745	614,745
Goodwill	23,911	23,911
Subscriber lists, net of accumulated amortization of $118,269 and $118,266	33	36
Other assets, net of accumulated amortization of $10,779 and $8,565	16,504	18,955
Total assets	1,551,370	1,535,423
CURRENT LIABILITIES
Accounts payable, accrued expenses and other current liabilities	139,359	147,017
Deferred revenue	28,028	27,228
Current portion of long-term debt	9,000	9,000
Total current liabilities	176,387	183,245
Long-term debt, less current portion	1,488,000	1,513,000
Other non-current liabilities	17,401	31,376
Total liabilities	1,681,788	1,727,621
Commitments and contingencies (Note 10)
MEMBER'S DEFICIT
Capital contributions	321,256	324,861
Accumulated deficit	(451,674)	(517,059)
Total member's deficit	(130,418)	(192,198)
Total liabilities and member's deficit	$ 1,551,370	$ 1,535,423

Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 1,488	$ 1,882
Accumulated depreciation	1,473,190	1,399,778
Accumulated amortization on Subscriber lists	118,269	118,266
Accumulated amortization on Other assets	$ 10,779	$ 8,565

Consolidated Statements of Operations (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]
Revenues	$ 176,596	$ 170,554	$ 523,209	$ 509,905
Costs and expenses:
Service costs (exclusive of depreciation and amortization)	75,869	74,662	227,594	222,871
Selling, general and administrative expenses	31,105	29,539	89,365	85,530
Management fee expense	3,200	2,650	9,200	8,985
Depreciation and amortization	29,211	28,653	86,368	86,729
Operating income	37,211	35,050	110,682	105,790
Interest expense, net	(23,845)	(23,752)	(71,105)	(72,256)
Gain (loss) on derivatives, net	2,835	(61)	13,962	441
Gain on sale of cable systems, net				5,202
Loss on early extinguishment of debt				(6,468)
Investment income from affiliate	4,500	4,500	13,500	13,500
Other expense, net	(638)	(653)	(1,654)	(1,551)
Net income	$ 20,063	$ 15,084	$ 65,385	$ 44,658

Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 65,385	$ 44,658
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation and amortization	86,368	86,729
Gain on derivatives, net	(13,962)	(441)
Gain on sale of cable systems, net		(5,202)
Loss on early extinguishment of debt		6,468
Amortization of deferred financing costs	2,373	2,508
Changes in assets and liabilities, net of effects from acquisitions:
Accounts receivable, net	(1,195)	(12,056)
Accounts receivable-affiliates	(7,087)
Prepaid expenses and other assets	(2,580)	(4,888)
Accounts payable, accrued expenses and other current liabilities	(9,273)	1,194
Deferred revenue	800	951
Other non-current liabilities	(23)	(60)
Net cash flows provided by operating activities	120,806	119,861
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(95,578)	(79,750)
Change in accrued property, plant and equipment	717	(2,495)
Acquisition of cable systems		(1,186)
Proceeds from sale of cable systems, net		11,018
Net cash flows used in investing activities	(94,861)	(72,413)
CASH FLOWS FROM FINANCING ACTIVITIES:
New borrowings of bank debt	150,000	194,000
Repayment of bank debt	(175,000)	(570,000)
Issuance of senior notes		250,000
Capital contributions from parent (Note 8)		111,000
Capital distributions to parent (Note 8)	(3,800)	(18,000)
Financing costs		(5,008)
Other financing activities	1,104	(1,210)
Net cash flows used in financing activities	(27,696)	(39,218)
Net change in cash	(1,751)	8,230
CASH, beginning of period	9,394	12,438
CASH, end of period	7,643	20,668
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest, net of amounts capitalized	$ 81,163	$ 72,681

Organization	9 Months Ended
Organization	Sep. 30, 2013
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, which is 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, 2012. 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, 2013. 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 $3.1 million and $3.0 million for the three months ended September 30, 2013 and 2012, respectively, and approximately $9.2 million for each of the nine months ended September 30, 2013 and 2012. *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	9 Months Ended
Recent Accounting Pronouncements	Sep. 30, 2013
Accounting Changes And Error Corrections [Abstract]
Recent Accounting Pronouncements	2. RECENT ACCOUNTING PRONOUNCEMENTS In July 2012, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2012-02 (“ASU 2012-02”) Testing Indefinite-Lived Intangible Assets for Impairment. ASU 2012-02 expands the guidance in Accountings Standard Update No. 2011-08 (“ASU 2011-08”) Intangibles – Goodwill and Other to include indefinite-lived intangible assets other than goodwill. We adopted this ASU on December 1, 2012. ASU 2012-02 did not have a material impact on our financial statements or related disclosures. In January 2013, the FASB issued Accounting Standards Update No. 2013-01 (“ASU 2013-01”), Balance Sheet (Topic 210). ASU 2013-01 contains amendments to balance sheet guidance. The amendments clarify the scope of ASU 2011-11 and apply to derivatives accounted for in accordance with Topic 815, Derivatives and Hedging. An entity is required to apply the amendments for fiscal years beginning on or after January 1, 2013, and interim periods within those annual periods. An entity should provide the required disclosures retrospectively for all comparative periods presented. The effective date is the same as the effective date of ASU 2011-11. We adopted ASU 2013-01 on January 1, 2013. ASU 2013-01 did not have a material impact on our financial statements or related disclosures. In February 2013, the FASB issued Accounting Standards Update No. 2013-02 (“ASU 2013-02”), Comprehensive Income (Topic 220). This ASU contains amendments to the guidance surrounding accumulated other comprehensive income. The amendments do not change the current requirements for reporting net income or other comprehensive income in financial statements. However, the amendments require an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, an entity is required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income but only if the amount reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period. For other amounts that are not required under U.S. GAAP to be reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures required under U.S. GAAP that provide additional detail about those amounts. For public entities, ASU 2013-02 was effective prospectively for reporting periods beginning after December 15, 2012. We adopted ASU 2013-02 on January 1, 2013. ASU 2013-02 did not have an impact on our financial statements or related disclosures.

- 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.

+ References+ Details

Fair Value

9 Months Ended

Sep. 30, 2013

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 September 30, 2013. These assets and liabilities 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 September 30, 2013, our interest rate exchange agreement liabilities, net, were valued at $34.1 million using Level 2 inputs, as follows (dollars in thousands):


	Fair Value as of September 30, 2013
	Level 1		Level 2		Level 3		Total
Assets
Interest rate exchange agreements	$	—	$	—	$	—	$	—
Liabilities
Interest rate exchange agreements	$	—	$	34,053	$	—	$	34,053

Interest rate exchange agreements—liabilities, net	$	—	$	34,053	$	—	$	34,053

As of December 31, 2012, our interest rate exchange agreement liabilities, net, were valued at $48.0 million using Level 2 inputs, as follows (dollars in thousands):


	Fair Value as of December 31, 2012
	Level 1		Level 2		Level 3		Total
Assets
Interest rate exchange agreements	$	—	$	—	$	—	$	—
Liabilities
Interest rate exchange agreements	$	—	$	48,015	$	—	$	48,015

Interest rate exchange agreements—liabilities, net	$	—	$	48,015	$	—	$	48,015

The fair value of our interest rate exchange agreements is the estimated amount that we would receive or pay to terminate such agreements, taking into account projected interest rates, based on quoted LIBOR futures, and the remaining time to maturities. While our interest rate exchange agreements 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. Based upon the mark-to-market valuation of these interest rate exchange agreements, all of our interest rate exchange agreements were in a liability position as of September 30, 2013 and December 31, 2012, and therefore no assets were recorded on our consolidated balance sheets. As of both September 30, 2013 and December 31, 2012, based on such mark-to-market valuations, we recorded an accumulated current liability in “accounts payable, accrued expenses and other current liabilities” of $19.3 million and, as of the same dates, an accumulated long-term liability in “other non-current liabilities” of $14.8 million and $28.7 million, respectively.

As a result of the mark-to-market valuations on these interest rate exchange agreements, we recorded a net gain on derivatives of $2.8 million and a net loss on derivatives of $0.1 million for the three months ended September 30, 2013 and 2012, respectively, and a net gain on derivatives of $14.0 million and $0.4 million for the nine months ended September 30, 2013 and 2012, respectively.

- Definition

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

+ References+ Details

Property, Plant and Equipment

9 Months Ended

Sep. 30, 2013

Property Plant And Equipment [Abstract]

Property, Plant and Equipment

4. PROPERTY, PLANT AND EQUIPMENT

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


	September 30, 2013			December 31, 2012
Cable systems, equipment and subscriber devices	$	2,038,195		$	1,956,823
Furniture, fixtures and office equipment		52,109			51,829
Vehicles		37,223			36,342
Buildings and leasehold improvements		16,835			16,695
Land and land improvements		1,581			1,581

Property, plant and equipment, gross	$	2,145,943			2,063,270
Accumulated depreciation		(1,473,190	)		(1,399,778	)

Property, plant and equipment, net	$	672,753		$	663,492

- 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

9 Months Ended

Sep. 30, 2013

Payables And Accruals [Abstract]

Accounts Payable, Accrued Expenses and Other Current Liabilities

5. ACCOUNTS PAYABLE, ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES

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


	September 30,		December 31,
	2013		2012
Accounts payable—non-affiliates	$	27,914	$	24,144
Accrued programming costs		19,562		17,792
Liabilities under interest rate exchange agreements		19,253		19,262
Accrued taxes and fees		15,158		15,709
Accrued payroll and benefits		12,011		12,420
Subscriber advance payments		11,036		10,999
Accrued service costs		7,613		9,243
Accrued interest		7,539		19,930
Accrued property, plant and equipment		5,482		4,765
Bank overdrafts ⁽¹⁾		4,372		3,465
Accrued telecommunications costs		1,305		1,266
Accounts payable—affiliates		—		32
Other accrued expenses		8,114		7,990

Accounts payable, accrued expenses and other current liabilities	$	139,359	$	147,017

(1)

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

Debt

9 Months Ended

Sep. 30, 2013

Debt Disclosure [Abstract]

Debt

6. DEBT

As of September 30, 2013 and December 31, 2012, our debt consisted of (dollars in thousands):


	September 30,		December 31,
	2013		2012
Bank credit facility	$	897,000	$	922,000
9¹⁄₈% senior notes due 2019		350,000		350,000
7¹⁄₄% senior notes due 2022		250,000		250,000

Total debt	$	1,497,000	$	1,522,000
Less: current portion		9,000		9,000

Total long-term debt	$	1,488,000	$	1,513,000

Bank Credit Facility

As of September 30, 2013, we maintained a $1.073 billion bank credit facility (the “credit facility”), comprising:

•

$225.2 million of revolving credit commitments, which expire on December 31, 2014; if we do not refinance the existing Term Loan C under the credit facility prior to June 30, 2014, our existing revolving credit commitments will expire, and any amounts outstanding would then become due on such date;

•

$606.1 million of outstanding Term Loan C borrowings, which mature on January 31, 2015; and

•

$241.9 million of outstanding Term Loan E borrowings, which mature on October 23, 2017.

As of September 30, 2013, we had $166.8 million of unused revolving credit commitments, all of which were available to be borrowed and used for general corporate purposes, after giving effect to $49.0 million of outstanding loans and $9.4 million of letters of credit issued thereunder to various parties as collateral.

The credit facility is collateralized by our ownership interests in our operating subsidiaries, and is guaranteed by us on a limited recourse basis to the extent of such ownership interests. As of September 30, 2013, 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. As of September 30, 2013, we were in compliance with all covenants under the credit agreement, including a total leverage ratio of 3.1 to 1.0 and an interest coverage ratio of 2.9 to 1.0.

Interest Rate Exchange Agreements

We use interest rate exchange agreements (which we refer to as “interest rate swaps”) with various banks to fix the variable portion of borrowings under the credit facility. We believe this reduces the potential volatility in our interest expense that would otherwise 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 and nine months ended, September 30, 2013 and 2012. As of September 30, 2013:

•

We had current interest rate swaps that fixed the variable portion of $700 million of borrowings under the credit facility at a rate of 3.0%, of which $400 million and $300 million expire during the years ending December 31, 2014 and 2015, respectively; and

•

We had forward-starting interest rate swaps that will fix the variable portion of $200 million of borrowings under the credit facility at a rate of 3.0% for one year commencing December 2014.

As of September 30, 2013, the weighted average interest rate on outstanding borrowings under the credit facility, including the effect of our interest rate swaps, was 4.6%.

Senior Notes

As of September 30, 2013, 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 indenture governing our senior 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. As of September 30, 2013, we were in compliance with all covenants under the indenture, including a debt to operating cash flow ratio of 5.3 to 1.0.

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 $5.6 million and $6.4 million as of September 30, 2013 and December 31, 2012, respectively.

Debt Ratings

MCC’s corporate credit rating is B1, with a stable outlook, by Moody’s, and B+, with a positive outlook, by Standard and Poor’s. Our senior unsecured credit rating is B3, with a stable outlook, by Moody’s, and B-, with a positive outlook, by Standard and Poor’s.

There are no covenants, events of default, borrowing conditions or other terms in the credit agreement or indenture that are based on changes in our credit rating assigned by any rating agency.

Fair Value

As of September 30, 2013 and December 31, 2012, 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):


	September 30, 2013		December 31, 2012
9¹⁄₈% senior notes due 2019	$	384,125	$	388,719
7¹⁄₄% senior notes due 2022		262,500		271,250

Total senior notes	$	646,625	$	659,969

Bank credit facility	$	889,729	$	925,356

Preferred Membership Interest in Affiliated Company	9 Months Ended
Preferred Membership Interest in Affiliated Company	Sep. 30, 2013
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, another wholly-owned subsidiary of MCC, 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 September 30, 2013 and 2012, and $13.5 million during each of the nine months ended September 30, 2013 and 2012.

- 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.

+ References+ Details

Member's Deficit	9 Months Ended
Member's Deficit	Sep. 30, 2013
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. 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 and $18.0 million during the nine months ended September 30, 2013 and 2012, respectively, and received capital contributions from parent in cash of $111.0 million during the nine months ended September 30, 2012.

Related Party Transactions	9 Months Ended
Related Party Transactions	Sep. 30, 2013
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. MCC 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 $2.7 million for the three months ended September 30, 2013 and 2012, respectively, and $9.2 million and $9.0 million for the nine months ended September 30, 2013 and 2012, respectively. We are a preferred equity investor in Mediacom Broadband LLC, a wholly-owned subsidiary of MCC. See Note 7. Accounts receivable – affiliates and accounts payable – affiliates represent amounts due from, or amounts due to, MCC or its subsidiaries (other than us), are reported on a net basis for financial statement presentation purposes. As of September 30, 2013, there were net balances recorded in accounts receivable – affiliates of $7.1 million, and as of December 31, 2012, there were net balances recorded in accounts payable – affiliates of less than $0.1 million.

- 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	9 Months Ended
Commitments and Contingencies	Sep. 30, 2013
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	9 Months Ended
Goodwill and Other Intangible Assets	Sep. 30, 2013
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, 2012, which has negative equity carrying value. We 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. The economic conditions currently affecting the U.S. economy and the long-term impact on the fundamentals of our business may have a negative impact on the fair values of the assets in our reporting units. This may result in the recognition of an impairment loss in the future. Because we believe there has not been a meaningful change in the long-term fundamentals of our business during the first nine months of 2013, we have determined that there has been no triggering event under ASC 350 and, as such, no interim impairment test was required as of September 30, 2013.

- 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)	9 Months Ended
Organization (Policies)	Sep. 30, 2013
Accounting Changes And Error Corrections [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, which is 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, 2012. 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, 2013. 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 $3.1 million and $3.0 million for the three months ended September 30, 2013 and 2012, respectively, and approximately $9.2 million for each of the nine months ended September 30, 2013 and 2012.
Reclassifications	*Reclassifications* Certain reclassifications have been made to prior year amounts to conform to the current year presentation.
Testing Indefinite-Lived Intangible Assets for Impairment	In July 2012, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2012-02 (“ASU 2012-02”) Testing Indefinite-Lived Intangible Assets for Impairment. ASU 2012-02 expands the guidance in Accountings Standard Update No. 2011-08 (“ASU 2011-08”) Intangibles – Goodwill and Other to include indefinite-lived intangible assets other than goodwill. We adopted this ASU on December 1, 2012. ASU 2012-02 did not have a material impact on our financial statements or related disclosures.
Balance Sheet	In January 2013, the FASB issued Accounting Standards Update No. 2013-01 (“ASU 2013-01”), Balance Sheet (Topic 210). ASU 2013-01 contains amendments to balance sheet guidance. The amendments clarify the scope of ASU 2011-11 and apply to derivatives accounted for in accordance with Topic 815, Derivatives and Hedging. An entity is required to apply the amendments for fiscal years beginning on or after January 1, 2013, and interim periods within those annual periods. An entity should provide the required disclosures retrospectively for all comparative periods presented. The effective date is the same as the effective date of ASU 2011-11. We adopted ASU 2013-01 on January 1, 2013. ASU 2013-01 did not have a material impact on our financial statements or related disclosures.
Comprehensive Income	In February 2013, the FASB issued Accounting Standards Update No. 2013-02 (“ASU 2013-02”), Comprehensive Income (Topic 220). This ASU contains amendments to the guidance surrounding accumulated other comprehensive income. The amendments do not change the current requirements for reporting net income or other comprehensive income in financial statements. However, the amendments require an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, an entity is required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income but only if the amount reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period. For other amounts that are not required under U.S. GAAP to be reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures required under U.S. GAAP that provide additional detail about those amounts. For public entities, ASU 2013-02 was effective prospectively for reporting periods beginning after December 15, 2012. We adopted ASU 2013-02 on January 1, 2013. ASU 2013-02 did not have an impact on our financial statements or related disclosures.

Fair Value (Tables)

9 Months Ended

Sep. 30, 2013

Fair Value Disclosures [Abstract]

Fair Value at Recurring Basis

As of September 30, 2013, our interest rate exchange agreement liabilities, net, were valued at $34.1 million using Level 2 inputs, as follows (dollars in thousands):


	Fair Value as of September 30, 2013
	Level 1		Level 2		Level 3		Total
Assets
Interest rate exchange agreements	$	—	$	—	$	—	$	—
Liabilities
Interest rate exchange agreements	$	—	$	34,053	$	—	$	34,053

Interest rate exchange agreements—liabilities, net	$	—	$	34,053	$	—	$	34,053

As of December 31, 2012, our interest rate exchange agreement liabilities, net, were valued at $48.0 million using Level 2 inputs, as follows (dollars in thousands):


	Fair Value as of December 31, 2012
	Level 1		Level 2		Level 3		Total
Assets
Interest rate exchange agreements	$	—	$	—	$	—	$	—
Liabilities
Interest rate exchange agreements	$	—	$	48,015	$	—	$	48,015

Interest rate exchange agreements—liabilities, net	$	—	$	48,015	$	—	$	48,015

Property, Plant and Equipment (Tables)

9 Months Ended

Sep. 30, 2013

Property Plant And Equipment [Abstract]

Components of Property, Plant and Equipment


	September 30, 2013			December 31, 2012
Cable systems, equipment and subscriber devices	$	2,038,195		$	1,956,823
Furniture, fixtures and office equipment		52,109			51,829
Vehicles		37,223			36,342
Buildings and leasehold improvements		16,835			16,695
Land and land improvements		1,581			1,581

Property, plant and equipment, gross	$	2,145,943			2,063,270
Accumulated depreciation		(1,473,190	)		(1,399,778	)

Property, plant and equipment, net	$	672,753		$	663,492

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

9 Months Ended

Sep. 30, 2013

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):


	September 30,		December 31,
	2013		2012
Accounts payable—non-affiliates	$	27,914	$	24,144
Accrued programming costs		19,562		17,792
Liabilities under interest rate exchange agreements		19,253		19,262
Accrued taxes and fees		15,158		15,709
Accrued payroll and benefits		12,011		12,420
Subscriber advance payments		11,036		10,999
Accrued service costs		7,613		9,243
Accrued interest		7,539		19,930
Accrued property, plant and equipment		5,482		4,765
Bank overdrafts ⁽¹⁾		4,372		3,465
Accrued telecommunications costs		1,305		1,266
Accounts payable—affiliates		—		32
Other accrued expenses		8,114		7,990

Accounts payable, accrued expenses and other current liabilities	$	139,359	$	147,017

(1)

Debt (Tables)

9 Months Ended

Sep. 30, 2013

Debt Disclosure [Abstract]

Summary of Debt

As of September 30, 2013 and December 31, 2012, our debt consisted of (dollars in thousands):


	September 30,		December 31,
	2013		2012
Bank credit facility	$	897,000	$	922,000
9¹⁄₈% senior notes due 2019		350,000		350,000
7¹⁄₄% senior notes due 2022		250,000		250,000

Total debt	$	1,497,000	$	1,522,000
Less: current portion		9,000		9,000

Total long-term debt	$	1,488,000	$	1,513,000

Fair Values of Senior Notes and Outstanding Debt


	September 30, 2013		December 31, 2012
9¹⁄₈% senior notes due 2019	$	384,125	$	388,719
7¹⁄₄% senior notes due 2022		262,500		271,250

Total senior notes	$	646,625	$	659,969

Bank credit facility	$	889,729	$	925,356

Organization - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
Organization - Additional Information (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Amount due from affiliate by subsidiary	$ 100		$ 100
Franchise fees imposed by local government	$ 3,100,000	$ 3,000,000	$ 9,200,000	$ 9,200,000

- 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).

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Fair Value - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
Fair Value - Additional Information (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Accumulated current liability in accounts payable, accrued expenses and other current liabilities	$ 19,300,000		$ 19,300,000
Accumulated long-term liability in other non-current liabilities	14,800,000		14,800,000		28,700,000
Net gain/loss on derivatives	2,800,000	100,000	14,000,000	400,000
Interest Rate Exchange Agreements [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Liabilities, net	34,053,000		34,053,000		48,015,000
Level 2 [Member] \| Interest Rate Exchange Agreements [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Liabilities, net	$ 34,053,000		$ 34,053,000		$ 48,015,000

- 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.

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- 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 at Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Liabilities	$ 19,253	$ 19,262
Interest Rate Exchange Agreements [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Assets
Liabilities	34,053	48,015
Liabilities, net	34,053	48,015
Level 1 [Member] \| Interest Rate Exchange Agreements [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Assets
Liabilities
Liabilities, net
Level 2 [Member] \| Interest Rate Exchange Agreements [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Assets
Liabilities	34,053	48,015
Liabilities, net	34,053	48,015
Level 3 [Member] \| Interest Rate Exchange Agreements [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring 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	Sep. 30, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,145,943	$ 2,063,270
Accumulated depreciation	(1,473,190)	(1,399,778)
Property, plant and equipment, net	672,753	663,492
Cable Systems, Equipment and Subscriber Devices [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,038,195	1,956,823
Furniture, Fixtures and Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	52,109	51,829
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	37,223	36,342
Buildings and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	16,835	16,695
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 - Accounts Payable, Accrued Expenses and Other Current Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Payables And Accruals [Abstract]
Accounts payable-non-affiliates	$ 27,914	$ 24,144
Accrued programming costs	19,562	17,792
Liabilities under interest rate exchange agreements	19,253	19,262
Accrued taxes and fees	15,158	15,709
Accrued payroll and benefits	12,011	12,420
Subscriber advance payments	11,036	10,999
Accrued service costs	7,613	9,243
Accrued interest	7,539	19,930
Accrued property, plant and equipment	5,482	4,765
Bank overdrafts	4,372	3,465
Accrued telecommunications costs	1,305	1,266
Accounts payable-affiliates		32
Other accrued expenses	8,114	7,990
Accounts payable, accrued expenses and other current liabilities	$ 139,359	$ 147,017

Debt - Summary of Debt (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Credit Facilities [Line Items]
Total debt	$ 1,497,000	$ 1,522,000
Less: current portion	9,000	9,000
Total long-term debt	1,488,000	1,513,000
Bank Credit Facility [Member]
Credit Facilities [Line Items]
Total debt	897,000	922,000
9 1/8% Senior Notes Due 2019 [Member]
Credit Facilities [Line Items]
Total debt	350,000	350,000
7 1/4% Senior Notes Due 2022 [Member]
Credit Facilities [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 $) In Millions, unless otherwise specified					9 Months Ended							9 Months Ended			9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Loans Payable [Member]	Sep. 30, 2013 Letter of Credit [Member]	Sep. 30, 2013 December 31, 2014 [Member]	Sep. 30, 2013 December 31, 2015 [Member]	Sep. 30, 2013 Interest Rate Exchange Agreements [Member]	Sep. 30, 2013 Forward Interest Rate Swaps [Member]	Sep. 30, 2013 Bank Credit Facility [Member]	Sep. 30, 2013 Bank Credit Facility [Member] Maximum [Member]	Sep. 30, 2013 Bank Credit Facility [Member] Minimum [Member]	Sep. 30, 2013 9 1/8% Senior Notes Due 2019 [Member]	Sep. 30, 2013 9 1/8% Senior Notes Due 2019 [Member] Maximum [Member]	Sep. 30, 2013 9 1/8% Senior Notes Due 2019 [Member] Minimum [Member]	Sep. 30, 2013 7 1/4% Senior Notes Due 2022 [Member]	Sep. 30, 2013 Revolving Credit Commitments at Present [Member] Bank Credit Facility [Member]	Sep. 30, 2013 Term Loan C [Member] Bank Credit Facility [Member]	Sep. 30, 2013 Term Loan E [Member] Bank Credit Facility [Member]
Credit Facilities [Line Items]
Revolving credit commitment outstanding			$ 49.0	$ 9.4			$ 700.0	$ 200.0	$ 1,073.0								$ 606.1	$ 241.9
Revolving credit commitments																225.2
Expiration date of revolving credit commitments																Dec. 31, 2014	Jan. 31, 2015	Oct. 23, 2017
Unused revolving credit commitments									166.8
Leverage ratio										5.0	1.0
Interest coverage ratio										2.0	1.0
Covenants credit agreement of leverage ratio										3.1	1.0
Covenants credit agreement of interest coverage ratio										2.9	1.0
Interest rate on borrowings							3.00%	3.00%
Interest rate swap principal expiration scheduled amount					400	300
Average interest rates	4.60%
Outstanding senior notes	600											350			250
Required debt to operating cash flow													8.5	1.0
Debt to operating cash flow													5.3	1.0
Senior notes expiration date												August 2019			February 2022
Original issue discount incurred to raise debt	$ 5.6	$ 6.4

Debt - Fair Value of Senior Notes and Outstanding Debt (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Credit Facilities [Line Items]
7 1/4% senior notes due 2022	$ 646,625	$ 659,969
9 1/8% Senior Notes Due 2019 [Member]
Credit Facilities [Line Items]
7 1/4% senior notes due 2022	384,125	388,719
7 1/4% Senior Notes Due 2022 [Member]
Credit Facilities [Line Items]
7 1/4% senior notes due 2022	262,500	271,250
Bank Credit Facility [Member]
Credit Facilities [Line Items]
7 1/4% senior notes due 2022	$ 889,729	$ 925,356

Preferred Membership Interest In Affiliate Company - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
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	$ 13,500	$ 13,500

Member's Deficit - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Equity [Abstract]
Capital distributions to parent	$ (3,800)	$ (18,000)
Received capital contributions from parent		$ 111,000

Related Party Transactions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Related Party Transactions [Abstract]
Rate of annual gross operating revenues of our operating subsidiaries			4.50%
Management fees	$ 3.2	$ 2.7	$ 9.2	$ 9.0
Net balances recorded in accounts receivable - affiliates	7.1		7.1
Net balances recorded in accounts payable - affiliates					$ 0.1

- Definition

Amounts due within 1 year (or 1 business cycle) from other related parties which are not otherwise stated in the taxonomy.

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- Definition

For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

+ References+ Details