CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current Assets:
Accounts receivable, trade allowance for doubtful accounts	$ 15,525	$ 13,521
Property, plant and equipment, accumulated depreciation	9,224,430	9,230,326
Amortizable intangible assets, accumulated amortization	93,863	86,193
Deferred financing costs, accumulated amortization	38,625	67,156
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
CNYG 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)	800,000,000	800,000,000
Common stock, shares issued (in shares)	291,333,694	287,750,132
Common stock, shares outstanding (in shares)	213,017,553	210,561,118
Treasury stock (in shares)	78,316,141	77,189,014
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	54,137,673
Common stock, shares outstanding (in shares)	54,137,673	54,137,673
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
CSC Holdings, LLC [Member]
Current Assets:
Accounts receivable, trade allowance for doubtful accounts	15,525	13,521
Property, plant and equipment, accumulated depreciation	9,224,430	9,230,326
Amortizable intangible assets, accumulated amortization	93,863	86,193
Deferred financing costs, accumulated amortization	$ 22,542	$ 54,134
Stockholders'/Member's Deficiency:
Other member's equity, membership units issued (in shares)	17,631,479	17,631,479
Other member's equity, membership units outstanding (in shares)	17,631,479	17,631,479