CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
Current Assets:
Accounts receivable, trade allowance for doubtful accounts	$ 19,653	$ 17,786
Property, plant and equipment, accumulated depreciation	8,880,203	8,564,884
Amortizable intangible assets, accumulated amortization	89,088	60,028
Deferred financing and other costs, accumulated amortization	79,047	72,642
Stockholders'/Member's Deficiency:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Preferred stock, shares issued (in shares)	0	0
CSC Holdings, LLC [Member]
Current Assets:
Accounts receivable, trade allowance for doubtful accounts	19,653	17,786
Property, plant and equipment, accumulated depreciation	8,880,203	8,564,884
Amortizable intangible assets, accumulated amortization	89,088	60,028
Deferred financing and other costs, accumulated amortization	$ 72,657	$ 68,358
Stockholders'/Member's Deficiency:
Other member's equity, membership units issued (in shares)	14,432,750	14,432,750
Other member's equity, membership units outstanding (in shares)	14,432,750	14,432,750
CNYG Class A Common Stock [Member]
Stockholders'/Member's Deficiency:
Treasury stock (in shares)	50,501,133	38,526,921
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	800,000,000	800,000,000
Common stock, shares issued (in shares)	281,754,163	279,582,204
Common stock, shares outstanding (in shares)	231,253,030	241,055,283
CNYG Class B Common Stock [Member]
Stockholders'/Member's Deficiency:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	320,000,000	320,000,000
Common stock, shares issued (in shares)	54,137,673	54,148,223
Common stock, shares outstanding (in shares)	54,137,673	54,148,223
RMG Class A Common Stock [Member]
Stockholders'/Member's Deficiency:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	600,000,000	600,000,000
Common stock, shares issued (in shares)	0	0
RMG Class B Common Stock [Member]
Stockholders'/Member's Deficiency:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	160,000,000	160,000,000
Common stock, shares issued (in shares)	0	0