Document and Entity Information	9 Months Ended
Document and Entity Information	Sep. 30, 2012
Document and Entity Information [Abstract]
Entity Registrant Name	MEDIACOM LLC
Entity Central Index Key	0001064116
Document Type	10-Q
Document Period End Date	Sep. 30, 2012
Amendment Flag	false
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer

Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
CURRENT ASSETS
Cash	$ 20,668	$ 12,438
Accounts receivable, net of allowance for doubtful accounts of $586 and $740	47,704	35,648
Prepaid expenses and other current assets	11,222	6,736
Total current assets	79,594	54,822
Preferred equity investment in affiliated company	150,000	150,000
Property, plant and equipment, net of accumulated depreciation of $1,385,135 and $1,315,170	666,742	675,555
Franchise rights	614,596	616,807
Goodwill	23,907	24,046
Subscriber lists, net of accumulated amortization of $118,265 and $118,186	37	90
Other assets, net of accumulated amortization of $7,703 and $8,143	19,879	23,840
Total assets	1,554,755	1,545,160
CURRENT LIABILITIES
Accounts payable, accrued expenses and other current liabilities	146,597	146,073
Deferred revenue	27,559	26,608
Current portion of long-term debt	9,000	12,000
Total current liabilities	183,156	184,681
Long-term debt, less current portion	1,448,000	1,571,000
Other non-current liabilities	36,394	39,050
Total liabilities	1,667,550	1,794,731
Commitments and contingencies (Note 10)
MEMBER'S DEFICIT
Capital contributions	428,096	335,979
Accumulated deficit	(540,891)	(585,550)
Total member's deficit	(112,795)	(249,571)
Total liabilities and member's deficit	$ 1,554,755	$ 1,545,160

Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Consolidated Balance Sheets [Abstract]
Allowance for doubtful accounts	$ 586	$ 740
Accumulated depreciation	1,385,135	1,315,170
Accumulated amortization on subscriber lists	118,265	118,186
Accumulated amortization on other assets	$ 7,703	$ 8,143

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		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Consolidated Statements of Operations [Abstract]
Revenues	$ 170,554	$ 170,586	$ 509,905	$ 507,648
Costs and expenses :
Service costs (exclusive of depreciation and amortization)	74,662	73,636	222,871	224,651
Selling, general and administrative expenses	29,539	29,601	85,530	85,795
Management fee expense	2,650	2,644	8,985	8,573
Depreciation and amortization	28,653	29,506	86,729	88,214
Operating income	35,050	35,199	105,790	100,415
Interest expense, net	(23,752)	(24,193)	(72,256)	(73,627)
(Loss) gain on derivatives, net	(61)	(16,983)	441	(18,110)
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	(653)	(504)	(1,551)	(1,597)
Net income (Loss)	$ 15,084	$ (1,981)	$ 44,658	$ 20,581

Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
OPERATING ACTIVITIES:
Net income	$ 44,658	$ 20,581
Adjustments to reconcile net loss to net cash flows provided by operating activities:
Depreciation and amortization	86,729	88,214
(Gain) loss on derivatives, net	(441)	18,110
Gain on sale of cable systems, net	(5,202)
Loss on early extinguishment of debt	6,468
Amortization of deferred financing costs	2,508	2,952
Changes in assets and liabilities, net of effects from acquisitions:
Accounts receivable, net	(12,056)	(2,626)
Prepaid expenses and other assets	(4,888)	(858)
Accounts payable, accrued expenses and other current liabilities	1,194	(14,611)
Deferred revenue	951	1,338
Other non-current liabilities	(60)	(189)
Net cash flows provided by operating activities	119,861	112,911
INVESTING ACTIVITIES:
Capital expenditures	(79,750)	(74,513)
Acquisition of cable systems	(1,186)
Change in accrued property, plant and equipment	(2,495)
Proceeds from sale of cable systems, net	11,018
Redemption of restricted cash and cash equivalents		8,853
Net cash flows used in investing activities	(72,413)	(65,660)
FINANCING ACTIVITIES:
New borrowings of bank debt	194,000	183,000
Repayment of bank debt	(570,000)	(99,000)
Issuance of senior notes	250,000
Capital contributions from parent	111,000
Capital distributions to parent	(18,000)	(141,150)
Financing costs	(5,008)
Other financing activities - book overdrafts	(1,210)	(896)
Net cash flows used in financing activities	(39,218)	(58,046)
Net increase (decrease) in cash	8,230	(10,795)
CASH, beginning of period	12,438	22,014
CASH, end of period	20,668	11,219
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest, net of amounts capitalized	$ 72,681	$ 79,486

Organization

9 Months Ended

Sep. 30, 2012

Organization [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, 2011. 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, 2012.

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 September 30, 2012 and 2011, respectively, and approximately $9.2 million and $9.6 million for the nine months ended September 30, 2012 and 2011, respectively.

Reclassifications

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

Revision of Prior Period Financial Statements

In connection with the preparation of our consolidated financial statements as of, and for the year ended December 31, 2011, during the fourth quarter of 2011, we identified and corrected errors in the manner in which we recorded fixed assets and the related depreciation expense on fixed assets purchased by MCC on behalf of our operating subsidiaries. Such capital expenditures and associated depreciation were recorded at MCC, whereas they were related to, and should have been incurred by, our operating subsidiaries. In accordance with accounting guidance found in ASC 250-10 (SEC Staff Accounting Bulletin No. 99, Materiality), we assessed the materiality of the errors and concluded that the errors were not material to any of our previously-issued financial statements. In accordance with accounting guidance found in ASC 250-10 (SEC Staff Accounting Bulletin No. 108, Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements), we have revised all affected periods. These non-cash errors impacted our statement of operations and cash flows for the comparative periods presented.

The following table presents the impact of the revision on our three month ended Consolidated Statements of Operations (dollars in thousands):


	Three Months Ended September 30, 2011
	As Previously						As
	Reported			Adjustment			Revised
Depreciation and amortization expense	$	29,450		$	56		$	29,506
Operating income		35,255			(56	)		35,199
Net loss		(1,925	)		(56	)		(1,981	)

The following table presents the impact of the revision on our nine month ended Consolidated Statements of Operations (dollars in thousands):


	Nine Months Ended September 30, 2011
	As Previously					As
	Reported		Adjustment			Revised
Depreciation and amortization expense	$	88,022	$	192		$	88,214
Operating income		100,607		(192	)		100,415
Net income		20,773		(192	)		20,581

The following table presents the impact of the revision on our nine month ended Consolidated Statements of Cash Flows (dollars in thousands):


	Nine Months Ended September 30, 2011
	As Previously						As
	Reported			Adjustment			Revised
Net income	$	20,773		$	(192	)	$	20,581
Depreciation and amortization expense		88,022			192			88,214
Changes in assets and liabilities		(17,990	)		1,044			(16,946	)
Net cash flows provided by operating activities		111,867			1,044			112,911
Capital expenditures		(73,469	)		(1,044	)		(74,513	)
Net cash flows used in investing activities		(64,616	)		(1,044	)		(65,660	)

Recently Issued Accounting Pronouncements (Policies)	9 Months Ended
Recently Issued Accounting Pronouncements (Policies)	Sep. 30, 2012
Recently Issued Accounting Pronouncements [Abstract]
Reclassifications	Reclassifications Certain reclassifications have been made to prior year amounts to conform to the current year presentation.
Fair Value Measurements	In May 2011, the FASB issued Accounting Standards Update No. 2011-04 (“ASU 2011-04”), Fair Value Measurement (Topic 820) — Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRSs, which provides a converged framework for fair value measurements and related disclosures between generally accepted accounting principles in the U.S. and International Financial Reporting Standards. ASU 2011-04 amends the fair value measurement and disclosure guidance in the following areas: (i) Highest-and-best use and the valuation-premise concepts for non-financial assets; (ii) application to financial assets and liabilities with offsetting positions in market or counterparty credit risk; (iii) premiums or discounts in fair value measurement; (iv) fair value measurements for amounts classified in equity; and (v) other disclosure requirements particularly involving Level 3 inputs. This guidance will be effective for us as of January 1, 2012. We adopted ASU 2011-04 on January 1, 2012. The adoption of ASU 2011-04 did not have a material impact on our financial statements or related disclosures.
Intangibles - Goodwill and Other	In September 2011, the FASB issued Accounting Standards Update No. 2011-08 (“ASU 2011-08”) Intangibles — Goodwill and Other (Topic 350). Under ASU 2011-08, an entity has the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, an entity determines it is more likely than not that the fair value of a reporting unit is greater than its carrying amount, then performing the two-step impairment test is unnecessary. However, if an entity concludes otherwise, then it is required to perform the first step of the two-step impairment test. Under ASU 2011-08, an entity has the option to bypass the qualitative assessment for any reporting unit in any period and proceed directly to performing the first step of the two-step goodwill impairment test. An entity may resume performing the qualitative assessment in any subsequent period. ASU 2011-08 is effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011. We adopted ASU 2011-08 on January 1, 2012. The adoption of ASU 2011-08 did not have a material impact on our financial statements or related disclosures. In July 2012, the FASB issued Accounting Standards Update No. 2012-02 (“ASU 2012-02”) Intangibles—Goodwill and Other (Topic 350). ASU 2012-02 allows an entity to first assess qualitative factors to determine whether it is necessary to perform a quantitative impairment test. An entity would not be required to calculate the fair value of an indefinite-lived intangible asset unless the entity determines, based on qualitative assessment, that it is not more likely than not, the indefinite-lived intangible asset is impaired. ASU 2012-02 includes a number of events and circumstances for an entity to consider in conducting the qualitative assessment. ASU 2012-02 is effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012. Early adoption is permitted. We are currently assessing the potential impact that the adoption of ASU 2012-02 will have on our consolidated financial statements.

Organization (Details Textual) (USD $)	3 Months Ended		9 Months Ended
Organization (Details Textual) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Organization (Textual) [Abstract]
Amount due from affiliate by subsidiary	$ 100		$ 100
Franchise fees imposed by local government	$ 3,000,000	$ 3,100,000	$ 9,200,000	$ 9,600,000

Fair Value (Details) (Interest rate exchange agreements [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fair value at recurring basis
Assets
Liabilities	52,657	53,097
Liabilities, net	52,657	53,097
Level 1 [Member]
Fair value at recurring basis
Assets
Liabilities
Liabilities, net
Level 2 [Member]
Fair value at recurring basis
Assets
Liabilities	52,657	53,097
Liabilities, net	52,657	53,097
Level 3 [Member]
Fair value at recurring basis
Assets
Liabilities
Liabilities, net

Fair Value (Detail Textual) (USD $)	3 Months Ended		9 Months Ended
Fair Value (Detail Textual) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Fair Value (Additional Textual) [Abstract]
Accumulated current liability	$ 19,500,000		$ 19,500,000		$ 17,300,000
Accumulated long-term liability	33,200,000		33,200,000		35,800,000
Net gain on derivatives	100,000	17,000,000	400,000	18,100,000
Interest rate exchange agreements [Member]
Fair Value (Textual) [Abstract]
Liabilities, net	52,657,000		52,657,000		53,097,000
Level 2 [Member] \| Interest rate exchange agreements [Member]
Fair Value (Textual) [Abstract]
Liabilities, net	$ 52,657,000		$ 52,657,000		$ 53,097,000

Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Components of Property, plant and equipment
Property, plant and equipment, gross	$ 2,051,877	$ 1,990,725
Accumulated depreciation	(1,385,135)	(1,315,170)
Property, plant and equipment, net	666,742	675,555
Cable systems, equipment and subscriber devices [Member]
Components of Property, plant and equipment
Property, plant and equipment, gross	1,946,280	1,888,852
Furniture, fixtures and office equipment [Member]
Components of Property, plant and equipment
Property, plant and equipment, gross	51,204	47,467
Vehicles [Member]
Components of Property, plant and equipment
Property, plant and equipment, gross	36,131	36,208
Buildings and leasehold improvements [Member]
Components of Property, plant and equipment
Property, plant and equipment, gross	16,681	16,617
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	Sep. 30, 2012	Dec. 31, 2011
Table of accounts payable, accrued expenses and other current liabilities
Accounts payable - non - affiliates	$ 28,458	$ 19,728
Liabilities under interest rate exchange agreements	19,466	17,311
Accrued programming costs	19,143	19,040
Accrued taxes and fees	16,658	16,733
Subscriber advance payments	11,514	10,301
Accrued payroll and benefits	10,191	12,232
Accrued service costs	9,551	9,208
Accrued interest	7,628	13,319
Accounts payable - affiliates	6,224	6,924
Accrued property, plant and equipment	5,650	8,145
Book overdrafts	3,063	3,393
Accrued telecommunications costs	1,459	1,179
Other accrued expenses	7,592	8,560
Accounts payable, accrued expenses and other current liabilities	$ 146,597	$ 146,073

Debt (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Summary of debt
Total debt	$ 1,457,000	$ 1,583,000
Less: current portion	9,000	12,000
Total long-term debt	1,448,000	1,571,000
Bank credit facility [Member]
Summary of debt
Total debt	857,000	1,233,000
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

Debt (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fair values of senior notes and outstanding debt
Fair values of senior notes and outstanding debt	$ 654,875
9 1/8 % senior notes due 2019 [Member]
Fair values of senior notes and outstanding debt
Fair values of senior notes and outstanding debt	386,750	371,000
7 1/4% senior notes due 2022 [Member]
Fair values of senior notes and outstanding debt
Fair values of senior notes and outstanding debt	268,125
Bank credit facility [Member]
Fair values of senior notes and outstanding debt
Fair values of senior notes and outstanding debt	$ 838,970	$ 1,189,188

Debt (Details Textual) (USD $)	9 Months Ended						9 Months Ended												9 Months Ended				9 Months Ended		1 Months Ended
Debt (Details Textual) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Interest rate exchange agreements [Member] Rate	Sep. 30, 2012 Forward interest rate swaps [Member] Rate	Sep. 30, 2012 Loans payable [Member]	Sep. 30, 2012 Letters of credit [Member]	Sep. 30, 2012 February 15, 2017 [Member]	Sep. 30, 2012 February 15, 2018 [Member]	Sep. 30, 2012 February 15, 2019 [Member]	Sep. 30, 2012 December 31, 2012 [Member] Interest rate exchange agreements [Member]	Sep. 30, 2012 December 31, 2012 [Member] Forward interest rate swaps [Member]	Sep. 30, 2012 December 31, 2014 [Member] Interest rate exchange agreements [Member]	Sep. 30, 2012 December 31, 2014 [Member] Forward interest rate swaps [Member]	Sep. 30, 2012 Bank credit facility [Member]	Oct. 01, 2012 Bank credit facility [Member] Maximum [Member]	Sep. 30, 2012 Bank credit facility [Member] Maximum [Member]	Oct. 01, 2012 Bank credit facility [Member] Minimum [Member]	Sep. 30, 2012 Bank credit facility [Member] Minimum [Member]	Sep. 30, 2012 9 1/8 % senior notes due 2019 [Member]	Feb. 07, 2012 9 1/8 % senior notes due 2019 [Member]	Sep. 30, 2012 9 1/8 % senior notes due 2019 [Member] Maximum [Member]	Sep. 30, 2012 9 1/8 % senior notes due 2019 [Member] Minimum [Member]	Sep. 30, 2012 7 1/4% senior notes due 2022 [Member]	Feb. 07, 2012 7 1/4% senior notes due 2022 [Member]	Aug. 31, 2012 Revolving credit commitments at present [Member]	Oct. 15, 2012 Revolving credit commitments at present [Member]	Sep. 30, 2012 Revolving credit commitments at present [Member] Bank credit facility [Member]	Sep. 30, 2012 Term Loan C [Member] Bank credit facility [Member]	Sep. 30, 2012 Term Loan E [Member] Bank credit facility [Member]	Feb. 07, 2012 Term Loan D [Member] Bank credit facility [Member]
Debt (Textual) [Abstract]
Borrowings under credit facility			$ 700,000,000	$ 600,000,000	$ 0	$ 9,500,000								$ 1,082,000,000														$ 612,600,000	$ 244,400,000	$ 293,300,000
Revolving credit commitments																											225,200,000
Expiration date of revolving credit commitments																											Dec. 31, 2014	Jan. 31, 2015	Oct. 23, 2017
Unused revolving credit commitments														215,700,000
Leverage ratio																5.5		1.0
Interest coverage ratio																2.0		1.0
Leverage ratio covenant reduced commencing															5.0		1.0
Covenants credit agreement of leverage ratio																3.1		1.0
Covenants credit agreement of interest coverage ratio																2.8		1.0
Interest rate on borrowings			3.00%	2.90%
Current interest rate swaps scheduled to expire, amounts										400,000,000	400,000,000	300,000,000	200,000,000
Average interest rate	4.70%	4.80%
Outstanding senior notes	600,000,000																		350,000,000				250,000,000
Required debt to operating cash flow																					8.5	1.0
Debt to operating cash flow																					5.3	1.0
Aggregate principal amount of senior notes																								250,000,000
Senior notes expiration date																			August 2019				February 2022
Debt interest rate																				9.125%				7.25%
Financing costs	5,008,000																						5,000,000
Proceeds from issuance of senior notes																							245,000,000
Redeemable percentage of notes							103.625%	102.417%	101.208%
Capital contributions from parent	111,000,000																								96,000,000
Payment to Parent made for contribution																										$ 96,000,000

Member's Deficit (Details) (Going Private Transaction [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2012
Going Private Transaction [Member]
Member's Deficit (Textual) [Abstract]
Private Transaction required funding	$ 381.5
Capital distributions consisting of borrowings	100.0
Capital distributions consisting cash on hand	$ 36.5

Related Party Transactions (Details) (USD $)	3 Months Ended		9 Months Ended
Related Party Transactions (Details) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Related Party Transactions (Textual) [Abstract]
Management fees	$ 2,700,000	$ 2,600,000	$ 9,000,000	$ 8,600,000
Capital contributions from parent			111,000,000
Capital distributions to parent			$ (18,000,000)	$ (141,150,000)

Commitments and Contingencies (Details) (USD $)	9 Months Ended
Commitments and Contingencies (Details) (USD $)	Sep. 30, 2012	Mar. 18, 2009
Commitments and Contingencies (Textual) [Abstract]
Claim for compensatory damages, amount	$ 14,500,000
Increase in estimated cost for compensatory damages	26,000,000
Amount proposed by plaintiffs for alternative damages	42,000,000
Product liability low estimate	100,000
Product liability high estimate	2,300,000
Compensatory damages		8,863
Punitive damages		35,000
Aggregate compensatory damages		$ 16,200,000

Sale And Acquisition of Cable Systems, Net (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	9 Months Ended
	Jun. 30, 2012 Customers	Sep. 30, 2012	May 31, 2012 Customers
Sale and Acquisition of Cable Systems, Net (Textual) [Abstract]
Sale proceeds		$ 11.0
Gain on sale		5.2
Number of video product customers	600		3,000
Number of HSD product customers	400		1,200
Number of phone customers	600
Acquisition price for cable assets	$ 1.2

Subsequent Events (Details) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified	Oct. 15, 2012
Subsequent Event [Member]
Subsequent event (Textual) [Abstract]
Capital Distribution to parent	$ 96.0