Document and Entity Information	3 Months Ended
Document and Entity Information	Mar. 31, 2013
Document and Entity Information [Abstract]
Entity Registrant Name	MEDIACOM BROADBAND LLC
Entity Central Index Key	0001161364
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	$ 9,699	$ 11,796
Accounts receivable, net of allowance for doubtful accounts of $2,797 and $2,883	56,225	58,544
Prepaid expenses and other current assets	11,590	11,318
Total current assets	77,514	81,658
Property, plant and equipment, net of accumulated depreciation of $1,263,793 and $1,228,186	797,031	804,462
Franchise rights	1,176,908	1,176,908
Goodwill	195,945	195,945
Subscriber lists, net of accumulated amortization of $39,746 and $39,744	1	3
Other assets, net of accumulated amortization of $18,171 and $16,809	26,699	27,183
Total assets	2,274,098	2,286,159
CURRENT LIABILITIES
Accounts payable, accrued expenses and other current liabilities	165,958	168,033
Deferred revenue	34,859	34,559
Current portion of long-term debt	16,000	16,000
Total current liabilities	216,817	218,592
Long-term debt, less current portion	1,928,000	1,943,000
Other non-current liabilities	28,243	33,890
Total liabilities	2,173,060	2,195,482
Commitments and contingencies (Note 10)
PREFERRED MEMBERS' INTEREST (Note 7)	150,000	150,000
MEMBER'S DEFICIT
Capital contributions	74,601	86,112
Accumulated deficit	(123,563)	(145,435)
Total member's deficit	(48,962)	(59,323)
Total liabilities, preferred members' interest and member's deficit	$ 2,274,098	$ 2,286,159

Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Consolidated Balance Sheets [Abstract]
Allowance for doubtful accounts	$ 2,797	$ 2,883
Accumulated depreciation on property, plant and equipment	1,263,793	1,228,186
Accumulated amortization on subscriber lists	39,746	39,744
Accumulated amortization on other assets	$ 18,171	$ 16,809

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	$ 225,265	$ 221,200
Costs and expenses:
Service costs (exclusive of depreciation and amortization)	92,236	90,309
Selling, general and administrative expenses	44,796	43,982
Management fee expense	4,000	3,460
Depreciation and amortization	38,688	37,429
Operating income	45,545	46,020
Interest expense, net	(24,906)	(27,937)
Gain on derivatives, net	5,885	1,907
Other expense, net	(152)	(326)
Net income	26,372	19,664
Dividend to preferred members (Note 7)	4,500	4,500
Net income applicable to member	$ 21,872	$ 15,164

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	$ 26,372	$ 19,664
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation and amortization	38,688	37,429
Gain on derivatives, net	(5,885)	(1,907)
Amortization of deferred financing costs	1,362	1,202
Changes in assets and liabilities, net of effects from acquisitions:
Accounts receivable, net	2,319	421
Prepaid expenses and other assets	(1,115)	(3,385)
Accounts payable, accrued expenses and other current liabilities	(125)	17,748
Deferred revenue	300	158
Other non-current liabilities	(25)	(83)
Net cash flows provided by operating activities	61,891	71,247
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(31,290)	(34,513)
Change in accrued property, plant and equipment	(541)	(8,019)
Net cash flows used in investing activities	(31,831)	(42,532)
CASH FLOWS FROM FINANCING ACTIVITIES:
New borrowings of bank debt	57,000	52,500
Repayment of bank debt	(72,000)	(79,500)
Dividend payments on preferred members' interest	(4,500)	(4,500)
Capital distributions to parent (Note 8)	(11,600)
Other financing activities	(1,057)	924
Net cash flows used in financing activities	(32,157)	(30,576)
Net decrease in cash	(2,097)	(1,861)
CASH, beginning of period	11,796	11,730
CASH, end of period	9,699	9,869
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest, net of amounts capitalized	$ 16,835	$ 16,111

Organization

3 Months Ended

Mar. 31, 2013

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, 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 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 $6.0 million and $6.1 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 [Abstract]
Basis of Preparation of Unaudited Consolidated Financial Statements	*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, 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 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 $6.0 million and $6.1 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.
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 a material impact on our financial statements or related disclosures.

Organization (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Organization (Textual) [Abstract]
Franchise fees	$ 6.0	$ 6.1

Fair Value (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets
Interest rate exchange agreements
Liabilities
Interest rate exchange agreements	51,171	57,057
Interest rate exchange agreements liabilities, net	51,171	57,057
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	51,171	57,057
Interest rate exchange agreements liabilities, net	51,171	57,057
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
Fair Value (Details Textual) (USD $)	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Fair Value (Textual) [Abstract]
Interest rate exchange agreements liabilities, net	$ 51,171,000		$ 57,057,000
Accumulated current liability	24,000,000		24,200,000
Accumulated long-term liability	27,200,000		32,800,000
Net gain on derivatives	$ 5,900,000	$ 1,900,000

Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Property, plant and equipment
Property, plant and equipment, gross	$ 2,060,824	$ 2,032,648
Accumulated depreciation	(1,263,793)	(1,228,186)
Property, plant and equipment, net	797,031	804,462
Cable systems, equipment and subscriber devices [Member]
Property, plant and equipment
Property, plant and equipment, gross	1,943,143	1,914,933
Furniture, fixtures and office equipment [Member]
Property, plant and equipment
Property, plant and equipment, gross	44,533	44,206
Vehicles [Member]
Property, plant and equipment
Property, plant and equipment, gross	39,136	39,624
Buildings and leasehold improvements [Member]
Property, plant and equipment
Property, plant and equipment, gross	28,960	28,833
Land and land improvements [Member]
Property, plant and equipment
Property, plant and equipment, gross	$ 5,052	$ 5,052

Accounts Payable, Accrued Expenses and Other Current Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Accounts payable, accrued expenses and other current liabilities
Accounts payable - non - affiliates	$ 26,802	$ 32,433
Accrued programming costs	25,801	23,270
Liabilities under interest rate exchange agreements	23,971	24,234
Accrued taxes and fees	17,899	18,301
Accrued payroll and benefits	15,171	17,828
Accrued interest	13,144	7,580
Advance subscriber payments	10,048	9,141
Accrued service costs	9,008	7,954
Accrued property, plant and equipment	6,249	6,790
Accounts payable - affiliates	5,041	5,992
Bank overdrafts (1)	3,435	4,581
Accrued telecommunications costs	688	1,774
Other accrued expenses	8,701	8,155
Accounts payable, accrued expenses and other current liabilities	$ 165,958	$ 168,033

Debt (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Summary of debt
Bank credit facility	$ 1,644,000	$ 1,659,000
6 3/8 % senior notes due 2023	300,000	300,000
Total debt	1,944,000	1,959,000
Less: current portion	16,000	16,000
Total long-term debt	$ 1,928,000	$ 1,943,000

Debt (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair values of senior notes and outstanding debt under credit facility
6 3/8 % senior notes due 2023	$ 310,500	$ 307,500
Bank credit facility	$ 1,652,803	$ 1,666,265

Debt (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended					3 Months Ended											3 Months Ended							3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2012	Mar. 31, 2013 Moody's B1 Rating [Member]	Mar. 31, 2013 Moody's B3 Rating [Member]	Mar. 31, 2013 Standard & Poor's B+ Rating [Member]	Mar. 31, 2013 Standard & Poor's B- Rating [Member]	Mar. 31, 2013 Secured Debt [Member]	Apr. 01, 2014 Credit Facility Maximum [Member]	Apr. 01, 2013 Credit Facility Maximum [Member]	Mar. 31, 2013 Credit Facility Maximum [Member]	Apr. 01, 2014 Credit Facility Minimum [Member]	Apr. 01, 2013 Credit Facility Minimum [Member]	Mar. 31, 2013 Credit Facility Minimum [Member]	Mar. 31, 2013 Term Loan G [Member]	Mar. 31, 2013 Term Loan D [Member]	Mar. 31, 2013 Term Loan F [Member]	Mar. 31, 2013 0.6375% notes [Member]	Mar. 31, 2013 Revolving Credit Facility [Member]	Mar. 31, 2013 Maximum [Member]	Mar. 31, 2013 Minimum [Member]	Mar. 31, 2013 Senior Notes [Member]
Debt (Textual) [Abstract]
Term loan	$ 1,749.0																				$ 111.5
Revolving credit commitments	216.0
Outstanding term loan D borrowings mature										750.0
Million of outstanding term loan F borrowings mature										583.5
Million of outstanding term loan G borrowings mature.										199.0
Outstanding loan maturity date																	Jan. 20, 2020	Jan. 31, 2015	Oct. 23, 2017
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																						4.7	1.0
Covenants interest coverage ratio													2.7			1.0
Debt instrument credit rating						B1	B3	B+	B-
Senior notes due year																								2023-04
Senior notes interest rate																				6.375%
Forward-starting interest rate	300
Senior notes outstanding																				300
Indenture governing senior notes of cash flow ratio													8.5			1.0
Indenture covenants senior notes of cash flow ratio													5.8			1.0
Debt (Additional Textual) [Abstract]
Revolving credit Maturity Date	Dec. 31, 2016
Unused commitments	93.9
Letters of credit issued	10.6
Current interest rate swaps	800
Credit facility rate	3.30%
Current interest rate swaps expire			200	600
Effect of interest rate swaps	4.60%	4.50%
Borrowings credit facility interest rate percentage	2.60%
Other assets, net	$ 9.6				$ 10.0

Preferred Members' Interest (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Jul. 31, 2001
Preferred Members' Interest (Textual) [Abstract]
Preferred membership investment			$ 150
Cash dividend, payable	12.00%
Cash dividends on the preferred membership interest	$ 4.5	$ 4.5

Member's Deficit (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Members Deficit (Textual) [Abstract]
Capital distributions to parent	$ (11,600)

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 (Additional Textual) [Abstract]
Management fee expense	$ 4,000,000	$ 3,460,000
Amounts due from related parties	$ 0		$ 0
Maximum [Member]
Related Party Transactions (Textual) [Abstract]
Management fees	4.00%