Document and Entity Information	9 Months Ended
Document and Entity Information	Sep. 30, 2012
Document and Entity Information [Abstract]
Entity Registrant Name	MEDIACOM BROADBAND LLC
Entity Central Index Key	0001161364
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
Entity Common Stock, Shares Outstanding

Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
CURRENT ASSETS
Cash and cash equivalents	$ 213,137	$ 11,730
Accounts receivable, net of allowance for doubtful accounts of $1,435 and $1,149	60,261	64,071
Accounts receivable - affiliates	1,278
Prepaid expenses and other current assets	11,373	7,463
Total current assets	286,049	83,264
Property, plant and equipment, net of accumulated depreciation of $1,195,887 and $1,096,334	811,864	808,370
Franchise rights	1,176,908	1,176,908
Goodwill	195,945	195,945
Subscriber lists, net of accumulated amortization of $39,742 and $39,215	5	532
Other assets, net of accumulated amortization of $21,082 and $19,378	31,034	22,326
Total assets	2,501,805	2,287,345
CURRENT LIABILITIES
Accounts payable, accrued expenses and other current liabilities	175,696	170,532
Deferred revenue	34,598	33,525
Current portion of long-term debt	16,000	14,000
Total current liabilities	226,294	218,057
Long-term debt, less current portion	2,249,654	1,983,000
Other non-current liabilities	39,615	44,632
Total liabilities	2,515,563	2,245,689
Commitments and contingencies (Note 10)
PREFERRED MEMBERS' INTEREST (Note 8)	150,000	150,000
MEMBER'S DEFICIT
Capital contributions	(377)	94,344
Accumulated deficit	(163,381)	(202,688)
Total member's deficit	(163,758)	(108,344)
Total liabilities, preferred members' interest and member's deficit	$ 2,501,805	$ 2,287,345

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	$ 1,435	$ 1,149
Accumulated depreciation on property, plant and equipment	1,195,887	1,096,334
Accumulated amortization on subscriber lists	39,742	39,215
Accumulated amortization on other assets	$ 21,082	$ 19,378

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	$ 223,865	$ 220,244	$ 668,949	$ 655,660
Costs and expenses:
Service costs (exclusive of depreciation and amortization)	89,176	88,566	270,078	267,677
Selling, general and administrative expenses	45,964	44,872	134,010	130,117
Management fee expense	3,450	3,414	10,535	11,075
Depreciation and amortization	37,645	35,578	112,746	106,855
Operating income	47,630	47,814	141,580	139,936
Interest expense, net	(29,904)	(27,897)	(86,346)	(83,549)
(Loss) gain on derivatives, net	(6)	(17,159)	1,060	(21,363)
Loss on early extinguishment of debt	(2,376)		(2,376)
Other expense, net	(458)	(456)	(1,111)	(1,641)
Net income	14,886	2,302	52,807	33,383
Dividend to preferred members	4,500	4,500	13,500	13,500
Net income (loss) applicable to members	$ 10,386	$ (2,198)	$ 39,307	$ 19,883

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	$ 52,807	$ 33,383
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation and amortization	112,746	106,855
(Gain) loss on derivatives, net	(1,060)	21,363
Loss on early extinguishment of debt	(2,376)
Amortization of deferred financing costs	3,746	3,249
Changes in assets and liabilities, net of effects from acquisitions:
Accounts receivable, net	3,810	(4,355)
Accounts receivable - affiliates	(1,278)	28,784
Prepaid expenses and other assets	(3,621)	(5,405)
Accounts payable, accrued expenses and other current liabilities	4,850	29,918
Deferred revenue	1,073	1,426
Other non-current liabilities	(78)	(253)
Net cash flows provided by operating activities	173,496	214,965
INVESTING ACTIVITIES:
Capital expenditures	(116,001)	(113,782)
Change in accrued property, plant and equipment	(5,513)
Redemption of restricted cash and cash equivalents		6,153
Net cash flows used in investing activities	(121,514)	(107,629)
FINANCING ACTIVITIES:
New borrowings of bank debt	373,000	290,900
Repayment of bank debt	(329,500)	(158,900)
Issuance of senior notes	300,000
Redemption of senior notes	(74,846)
Dividend payments on preferred members' interest	(13,500)	(13,500)
Capital contributions from Parent	18,500
Capital distributions to parent	(112,125)	(250,700)
Financing costs	(12,955)
Other financing activities - book overdrafts	851	(1,161)
Net cash flows Provided By (used In) financing activities	149,425	(133,361)
Net increase (decrease) in cash	201,407	(26,025)
CASH AND CASH EQUIVALENTS, beginning of period	11,730	33,123
CASH and CASH EQUIVALENTS, end of period	213,137	7,098
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest, net of amounts capitalized	71,224	70,185
NON-CASH TRANSACTION-INVESTING:
Capital expenditures accrued during the period		$ 6,869

Organization

9 Months Ended

Sep. 30, 2012

Organization [Abstract]

ORGANIZATION

1. ORGANIZATION

Basis of Preparation of Unaudited Consolidated Financial Statements

Mediacom Broadband LLC (“Mediacom Broadband,” and collectively with its subsidiaries, “we,” “our” or “us”), a Delaware 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 Broadband Corporation (“Broadband Corporation”), a Delaware corporation wholly-owned by us, co-issued, jointly and severally with us, public debt securities. Broadband Corporation 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 $6.1 million and $6.2 million for the three months ended September 30, 2012 and 2011, respectively, and approximately $18.4 million and $18.7 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 Reported			Adjustment			As Revised
Depreciation and amortization expense	$	35,503		$	75		$	35,578
Operating income		47,889			(75	)		47,814
Net income		2,377			(75	)		2,302
Net income applicable to member		(2,123	)		(75	)		(2,198	)

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 Reported		Adjustment			As Revised
Depreciation and amortization expense	$	106,592	$	263		$	106,855
Operating income		140,199		(263	)		139,936
Net income		33,646		(263	)		33,383
Net income applicable to member		20,146		(263	)		19,883

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 Reported			Adjustment			As Revised
Net income	$	33,646		$	(263	)	$	33,383
Depreciation and amortization expense		106,592			263			106,855
Changes in assets and liabilities		48,284			1,831			50,115
Net cash flows provided by operating activities		213,134			1,831			214,965
Capital expenditures		(111,951	)		(1,831	)		(113,782	)
Net cash flows used in investing activities		(105,798	)		(1,831	)		(107,629	)

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 Measurement	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.

Fair Value (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Assets
Interest rate exchange agreements
Liabilities
Interest rate exchange agreements	62,212	63,273
Interest rate exchange agreements - liabilities, net	62,212	63,273
Level 1 [Member]
Assets
Interest rate exchange agreements
Liabilities
Interest rate exchange agreements
Interest rate exchange agreements - liabilities, net
Level 2 [Member]
Assets
Interest rate exchange agreements
Liabilities
Interest rate exchange agreements	62,212	63,273
Interest rate exchange agreements - liabilities, net	62,212	63,273
Level 3 [Member]
Assets
Interest rate exchange agreements
Liabilities
Interest rate exchange agreements
Interest rate exchange agreements - liabilities, net

Fair Value (Details Textual) (USD $)	3 Months Ended		9 Months Ended
Fair Value (Details Textual) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Fair Value (Textual) [Abstract]
Interest rate exchange agreement - liabilities, net	$ 62,212,000		$ 62,212,000		$ 63,273,000
Accumulated current liability	23,900,000		23,900,000		20,000,000
Accumulated long-term liability	38,300,000		38,300,000		43,200,000
Gain or loss on derivatives	$ 0	$ 17,200,000	$ 1,100,000	$ 21,400,000

Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Property, plant and equipment
Property, plant and equipment, gross	$ 2,007,751	$ 1,904,704
Accumulated depreciation	(1,195,887)	(1,096,334)
Property, plant and equipment, net	811,864	808,370
Cable systems, equipment and subscriber devices [Member]
Property, plant and equipment
Property, plant and equipment, gross	1,892,034	1,793,501
Furniture, fixtures and office equipment [Member]
Property, plant and equipment
Property, plant and equipment, gross	43,418	38,738
Vehicles [Member]
Property, plant and equipment
Property, plant and equipment, gross	38,660	39,018
Buildings and leasehold improvements [Member]
Property, plant and equipment
Property, plant and equipment, gross	28,604	28,432
Land and land improvements [Member]
Property, plant and equipment
Property, plant and equipment, gross	$ 5,035	$ 5,015

Accounts Payable, Accrued Expenses and Other Current Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Accounts payable, accrued expenses and other current liabilities
Accounts payable - non-affiliates	$ 34,196	$ 23,222
Liabilities under interest rate exchange agreements	23,914	20,036
Accrued programming costs	23,539	23,370
Accrued interest	19,302	9,552
Accrued taxes and fees	17,230	18,026
Accrued payroll and benefits	15,247	16,957
Accrued property, plant and equipment	10,073	15,586
Advance subscriber payments	9,801	8,554
Accrued service costs	8,246	7,041
Book overdrafts	4,168	2,221
Accounts payable - affiliates		15,143
Accrued telecommunications costs	1,472	1,384
Other accrued expenses	8,508	9,440
Accounts payable, accrued expenses and other current liabilities	$ 175,696	$ 170,532

Debt (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Summary of debt
Bank credit facility	$ 1,540,500	$ 1,497,000
Total debt	2,265,654	1,997,000
Less: current portion	16,000	14,000
Total long-term debt	2,249,654	1,983,000
8 1/2 Senior notes due 2015 [Member]
Summary of debt
Senior notes due	425,154	500,000
6 3/8 Senior notes due 2023 [Member]
Summary of debt
Senior notes due	$ 300,000

Debt (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fair values of senior notes and outstanding debt under credit facility
8 1/2 % senior notes due 2015	$ 431,871	$ 517,500
6 3/8 % percentage senior notes due 2023	300,000
Total	731,871
Bank credit facility	$ 1,515,117	$ 1,435,993

Debt (Details Textual) (USD $)	3 Months Ended		9 Months Ended																	9 Months Ended		9 Months Ended		9 Months Ended			9 Months Ended
Debt (Details Textual) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Jan. 20, 2020	Oct. 23, 2017	Dec. 31, 2016	Jan. 31, 2015	Dec. 31, 2014	Dec. 31, 2012	Aug. 27, 2012	Aug. 20, 2012	Aug. 14, 2012	Mar. 31, 2014 Credit Facility Maximum [Member]	Mar. 31, 2013 Credit Facility Maximum [Member]	Sep. 30, 2012 Credit Facility Maximum [Member]	Mar. 31, 2014 Credit Facility Minimum [Member]	Mar. 31, 2013 Credit Facility Minimum [Member]	Sep. 30, 2012 Credit Facility Minimum [Member]	Sep. 30, 2012 Term Loan G [Member]	Aug. 20, 2012 Term Loan G [Member]	Sep. 30, 2012 0.6375% notes [Member]	Dec. 31, 2011 0.6375% notes [Member]	Sep. 30, 2012 0.085% notes [Member]	Oct. 15, 2012 0.085% notes [Member]	Dec. 31, 2011 0.085% notes [Member]	Sep. 30, 2012 April 1 2018 [Member]	Sep. 30, 2012 April 1 2019 [Member]	Sep. 30, 2012 April 1 2020 [Member]	Sep. 30, 2012 Senior Notes [Member]
Debt (Textual) [Abstract]
Governing credit facility leverage ratio														5.0	5.5	6.0	1.0	1.0	1.0
Interest coverage ratio																1.75			1.0
Covenants credit facility leverage ratio																4.4			1.0
Covenants interest coverage ratio																2.4			1.0
Indenture governing senior notes of cash flow ratio																8.5			1.0
Indenture covenants senior notes of cash flow ratio																6.6			1.0
Point zero eight five percentage redeemed																								$ 1,014.17	$ 1,014.17
Principal Amount Outstanding																								1,000	1,000
Senior notes interest rate																														8.50%
Senior notes due year																														2015
Term Loan G under the credit facility, Principal amount	1,757,000,000		1,757,000,000																		200,000,000
Net proceeds from Term Loan G																				192,300,000
Financing costs			12,955,000																	7,700,000		5,300,000
Capital distribution to parent			112,125,000	250,700,000																70,000,000		26,000,000
8 1/2% senior notes due 2015																								425,200,000
6 3/8% senior notes due 2023																						300,000,000		425,154,000		500,000,000
Redemption of 8 1/2 % Senior notes			329,500,000	158,900,000																		74,800,000
6 3/8% Notes Redeemable																											103.188%	102.125%	101.063%
The aggregate principal amount			300,000,000																			300,000,000
Interest Payable	1,000		1,000																					2,400,000
Holders of the 8% Notes that accepted the Early Tender Premium			73,800,000																					1,022.50
Debt (Additional Textual) [Abstract]
Revolving credit commitments							216,000,000
Outstanding term loan D borrowings mature								754,000,000
Million of outstanding term loan F borrowings mature						586,500,000
Million of Outstanding Term Loan G Borrowings Mature					200,000,000
Unused commitments	205,400,000		205,400,000
Letters of credit issued	10,600,000		10,600,000
Current interest rate swaps	700,000,000
Credit facility rate	3.30%
Types of interest rate derivatives used	800
Borrowings credit facility interest rate percentage	2.90%
Senior notes outstanding	725,200,000		725,200,000
Current interest rate swaps expire									300,000,000	400,000,000
Forward-starting interest rate swaps commence									300,000,000	500,000,000
Effect of interest rate swaps	4.50%	4.30%
Borrowings under Term Loan G bear interest at a floating rate	2.00%		2.00%
London Interbank Offered Rate plus a margin	3.00%		3.00%
Minimum LIBOR	1.00%		1.00%
Quarterly Reductions			500,000
Percentage of Original Principal Amount at Every Quarter			0.25%
Final Payment at maturity	185,500,000		185,500,000
Percentage of original principal amount at maturity			92.75%
Net proceeds from Point zero six three seven five percentage notes			294,700,000
Cash Tender Offer												350,000,000	300,000,000
Early Tender Premium											20.00
Amount equal to accrued interest, payable in cash			1,000.00
Holders Who Tendered Their Notes After The Early Tender Date But Before The Expiration	1,002.50		1,002.50
Principal amount of Point zero eight five percentage notes	74,800,000		74,800,000
Loss on early extinguishment of debt	2,400,000		2,400,000
Net proceeds paid as a result of the Early Tender Premium			1,700,000
Unamortized deferred financing costs			0.5
Bank and other professional fees			$ 200,000

Member's Deficit (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Member's Deficit (Textual) [Abstract]
Private transaction required funding	$ 381.5
Borrowings under revolver	200.0
Cash on hand	$ 45.0

Subsequent Events (Details) (USD $)	9 Months Ended			9 Months Ended
Subsequent Events (Details) (USD $)	Sep. 30, 2012	Oct. 15, 2012 0.085% notes [Member]	Sep. 30, 2012 0.085% notes [Member]	Sep. 30, 2012 Revolver [Member]	Sep. 30, 2012 Cash and cash equivalents [Member]	Sep. 30, 2012 Capital Contribution Parent [Member]
Subsequent Events (Textual) [Abstract]
Point zero eight five percentage redeemed		$ 1,014.17	$ 1,014.17
Principal amount outstanding		1,000	1,000
Aggregate redemption price	431,200,000			132,000,000	203,100,000	96,000,000
Subsequent Events (Additional Textual) [Abstract]
8 1/2% Notes outstanding redeemed	$ 425,200,000