Consolidated Statement Of Stockholders' (Deficiency) Equity (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011
Consolidated Statement Of Stockholders' (Deficiency) Equity [Abstract]
Balance, December 31, 2010	$ 24,831
Cash capital contributions from Cablevision	20,813
Cash capital distributions to Cablevision	(20,813)
Non-cash capital distribution to Cablevision related to employee benefit plans as a result of the Distribution (see Note 4)	(6,602)
Non-cash capital distribution associated with the issuance of debt to Cablevision (see Note 1)	(1,250,000)
Non-cash capital contribution, net related to adjustments to liability for uncertain tax positions and net deferred tax assets as a result of the Distribution (see Note 5)	44,508
Non-cash capital contribution related to the utilization of Cablevision tax losses (see Note 5)	37,912
Non-cash capital distribution of promissory note receivable to Cablevision (see Note 4)	(17,113)
Non-cash capital contribution related to the allocation of Cablevision share-based compensation expense	8,343
Other non-cash capital distributions, net	(156)
Non-cash capital contribution related to the allocation of Cablevision share-based compensation expense	4,320
Proceeds from exercise of stock options	2,460
Treasury stock acquired from forfeiture and acquisition of restricted shares (see Note 13)	(83)
Accumulated other comprehensive loss relating to interest rate swap contracts designated as cash flow hedges, net of income taxes (see Note 9)	(10,893)
Net income	96,976
Balance, September 30, 2011	$ (1,065,497)