CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current Assets:
Accounts receivable, trade allowance for doubtful accounts	$ 12,112	$ 14,614
Property, plant, and equipment, accumulated depreciation	9,454,315	9,264,848
Amortizable intangible assets, accumulated amortization	60,018	78,047
Deferred financing costs, accumulated amortization	58,651	42,602
Stockholders' 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
Current Assets:
Accounts receivable, trade allowance for doubtful accounts	12,112	14,614
Property, plant, and equipment, accumulated depreciation	9,454,315	9,264,848
Amortizable intangible assets, accumulated amortization	60,018	78,047
Deferred financing costs, accumulated amortization	$ 32,983	$ 23,376
Stockholders' 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
CNYG Class A Common Stock
Stockholders' 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)	300,342,849	292,489,017
Common stock, shares outstanding (in shares)	220,219,935	213,598,590
Treasury stock (in shares)	80,122,914	78,890,427
CNYG Class B Common Stock
Stockholders' 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
Stockholders' 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
Stockholders' 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