Document and Entity Information	3 Months Ended
Document and Entity Information	Mar. 31, 2013
Document and Entity Information [Abstract]
Entity Registrant Name	MEDIACOM LLC
Entity Central Index Key	0001064116
Document Type	10-Q
Document Period End Date	Mar. 31, 2013
Amendment Flag	false
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer

Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
CURRENT ASSETS
Cash	$ 6,541	$ 9,394
Accounts receivable, net of allowance for doubtful accounts of $1,656 and $1,882	46,746	45,714
Accounts receivable - affiliates	357	1,603
Prepaid expenses and other current assets	12,248	7,541
Total current assets	65,892	64,252
Preferred membership interest in affiliated company (Note 7)	150,000	150,000
Property, plant and equipment, net of accumulated depreciation of $1,424,769 and $1,399,778	664,180	663,492
Franchise rights	614,745	614,745
Goodwill	23,911	23,911
Subscriber lists, net of accumulated amortization of $118,267 and $118,266	35	36
Other assets, net of accumulated amortization of $9,307 and $8,565	18,714	18,955
Total assets	1,537,477	1,535,391
CURRENT LIABILITIES
Accounts payable, accrued expenses and other current liabilities	134,229	146,985
Deferred revenue	29,494	27,228
Current portion of long-term debt	9,000	9,000
Total current liabilities	172,723	183,213
Long-term debt, less current portion	1,513,000	1,513,000
Other non-current liabilities	26,889	31,376
Total liabilities	1,712,612	1,727,589
Commitments and contingencies (Note 10)
MEMBER'S DEFICIT
Capital contributions	321,132	324,861
Accumulated deficit	(496,267)	(517,059)
Total member's deficit	(175,135)	(192,198)
Total liabilities and member's deficit	$ 1,537,477	$ 1,535,391

Consolidated Balance Sheets (Parenthetical) (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Consolidated Balance Sheets [Abstract]
Allowance for doubtful accounts	$ 1,656	$ 1,882
Accumulated depreciation	1,424,769	1,399,778
Accumulated amortization on subscriber lists	118,267	118,266
Accumulated amortization on other assets	$ 9,307	$ 8,565

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

+ References+ Details

Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Consolidated Statements of Operations [Abstract]
Revenues	$ 171,019	$ 168,657
Costs and expenses:
Service costs (exclusive of depreciation and amortization)	76,122	73,713
Selling, general and administrative expenses	27,932	27,618
Management fee expense	3,000	3,460
Depreciation and amortization	28,316	29,066
Operating income	35,649	34,800
Interest expense, net	(23,615)	(24,294)
Gain on derivatives, net	4,680	1,612
Loss on early extinguishment of debt		(6,468)
Investment income from affiliate	4,500	4,500
Other expense, net	(422)	(463)
Net income	$ 20,792	$ 9,687

Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 20,792	$ 9,687
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation and amortization	28,316	29,066
Gain on derivatives, net	(4,680)	(1,612)
Loss on early extinguishment of debt		6,468
Amortization of deferred financing costs	805	939
Changes in assets and liabilities, net of effects from acquisitions:
Accounts receivable, net	(1,032)	9,523
Accounts receivable - affiliates	1,246
Prepaid expenses and other assets	(5,521)	(11,351)
Accounts payable, accrued expenses and other current liabilities	(12,940)	(14,083)
Deferred revenue	2,266	244
Other non-current liabilities	194	(62)
Net cash flows provided by operating activities	29,446	28,819
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(28,754)	(20,537)
Change in accrued property, plant and equipment	(676)	(3,900)
Net cash flows used in investing activities	(29,430)	(24,437)
CASH FLOWS FROM FINANCING ACTIVITIES:
New borrowings	62,000	79,000
Repayment of bank debt	(62,000)	(332,000)
Issuance of senior notes		250,000
Capital distributions to parent (Note 8)	(3,800)
Financing costs		(4,722)
Other financing activities	931	(882)
Net cash flows used in financing activities	(2,869)	(8,604)
Net decrease in cash	(2,853)	(4,222)
CASH, beginning of period	9,394	12,438
CASH, end of period	6,541	8,216
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest, net of amounts capitalized	$ 34,242	$ 28,698

Organization

3 Months Ended

Mar. 31, 2013

Organization/Recently Accounting Pronouncements [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”), a New York limited liability company wholly-owned by Mediacom Communications Corporation (“MCC”), is involved in the acquisition and operation of cable systems serving smaller cities and towns in the United States. 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 $3.0 million and $3.1 million for the three months ended March 31, 2013 and 2012, respectively.

Reclassifications

Certain reclassifications have been made to prior year amounts to conform to the current year presentation.

Organization (Policies)	3 Months Ended
Organization (Policies)	Mar. 31, 2013
Organization/Recently Accounting Pronouncements [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”), a New York limited liability company wholly-owned by Mediacom Communications Corporation (“MCC”), is involved in the acquisition and operation of cable systems serving smaller cities and towns in the United States. 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 $3.0 million and $3.1 million for the three months ended March 31, 2013 and 2012, respectively.
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 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 ASU 2011-08 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. 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 a material impact on our financial statements or related disclosures.

Organization (Details) (USD $)	3 Months Ended
Organization (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012
Organization (Textual) [Abstract]
Amount due from affiliate by subsidiary	$ 100
Franchise fees imposed by local government	$ 3,000,000	$ 3,100,000

Fair Value (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair value at recurring basis
Liabilities	$ 19,031	$ 19,262
Interest rate exchange agreements [Member]
Fair value at recurring basis
Assets
Liabilities	43,318	48,015
Liabilities, net	43,318	48,015
Level 1 [Member] \| Interest rate exchange agreements [Member]
Fair value at recurring basis
Assets
Liabilities
Liabilities, net
Level 2 [Member] \| Interest rate exchange agreements [Member]
Fair value at recurring basis
Assets
Liabilities	43,318	48,015
Liabilities, net	43,318	48,015
Level 3 [Member] \| Interest rate exchange agreements [Member]
Fair value at recurring basis
Assets
Liabilities
Liabilities, net

Fair Value (Detail Textual) (USD $)	3 Months Ended
Fair Value (Detail Textual) (USD $)	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Fair Value (Additional Textual) [Abstract]
Accumulated current liability in accounts payable, accrued expenses and other current liabilities	$ 19,000,000		$ 19,300,000
Accumulated long-term liability in other non-current liabilities	24,300,000		28,700,000
Net gain on derivatives	4,700,000	1,600,000
Interest rate exchange agreements [Member]
Fair Value (Textual) [Abstract]
Liabilities, net	43,318,000		48,015,000
Level 2 [Member] \| Interest rate exchange agreements [Member]
Fair Value (Textual) [Abstract]
Liabilities, net	$ 43,318,000		$ 48,015,000

Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Components of property, plant and equipment
Property, plant and equipment, gross	$ 2,088,949	$ 2,063,270
Accumulated depreciation	(1,424,769)	(1,399,778)
Property, plant and equipment, net	664,180	663,492
Cable systems, equipment and subscriber devices [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	1,982,326	1,956,823
Furniture, fixtures and office equipment [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	52,131	51,829
Vehicles [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	36,214	36,342
Buildings and leasehold improvements [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	16,697	16,695
Land and land improvements [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	$ 1,581	$ 1,581

Accounts Payable, Accrued Expenses and Other Current Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Table of accounts payable, accrued expenses and other current liabilities
Accounts payable - non-affiliates	$ 24,239	$ 24,144
Accrued programming costs	19,335	17,792
Liabilities under interest rate exchange agreements	19,031	19,262
Accrued taxes and fees	14,499	15,709
Subscriber advance payments	11,277	10,999
Accrued payroll and benefits	10,864	12,420
Accrued service costs	8,932	9,243
Accrued interest	7,682	19,930
Bank overdrafts	4,325	3,465
Accrued property, plant and equipment	4,089	4,765
Accrued telecommunications costs	1,649	1,266
Other accrued expenses	8,307	7,990
Accounts payable, accrued expenses and other current liabilities	$ 134,229	$ 146,985

Debt (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Summary of debt
Total debt	$ 1,522,000	$ 1,522,000
Less: current portion	9,000	9,000
Total long-term debt	1,513,000	1,513,000
Bank credit facility [Member]
Summary of debt
Total debt	922,000	922,000
9 1/8 % senior notes due 2019 [Member]
Summary of debt
Total debt	350,000	350,000
7 1/4% senior notes due 2022 [Member]
Summary of debt
Total debt	$ 250,000	$ 250,000

Debt (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair values of senior notes and outstanding debt
Total senior notes	$ 666,563	$ 659,969
9 1/8 % senior notes due 2019 [Member]
Fair values of senior notes and outstanding debt
Total senior notes	391,563	388,719
7 1/4% senior notes due 2022 [Member]
Fair values of senior notes and outstanding debt
Total senior notes	275,000	271,250
Bank credit facility [Member]
Fair values of senior notes and outstanding debt
Total senior notes	$ 924,735	$ 925,356

Preferred Membership Interest in Affiliated Company (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Preferred Membership Interest in Affiliated Company (Textual) [Abstract]
Preferred membership investment	$ 150
Preferred annual cash dividend	12.00%
Cash dividends on preferred membership interest	$ 4.5	$ 4.5

Member's Deficit (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Member's Deficit (Textual) [Abstract]
Capital distributions to parent	$ 3.8

Related Party Transactions (Details) (USD $)	3 Months Ended
Related Party Transactions (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Related Party Transactions (Textual) [Abstract]
Management fees	$ 3,000,000	$ 3,500,000
Rate of annual gross operating revenues of our operating subsidiaries	4.50%
Due to Related parties	$ 0		$ 0

Commitments and Contingencies (Details) (USD $)	1 Months Ended
Commitments and Contingencies (Details) (USD $)	Feb. 28, 2013	Dec. 31, 2009
Commitments and Contingencies (Textual) [Abstract]
Compensatory damages		$ 8,863
Punitive damages		35,000
Settlement made	$ 55,000