EQUITY AND LONG-TERM INCENTIVE PLANS, Restricted Stock Award Activity (Details) - Cablevision Systems Corporation Employee Stock Plan - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Unrecognized Compensation Costs [Abstract]
Total unrecognized compensation cost related to unvested options and restricted shares granted under stock plans		$ 78,457
Weighted-average period to recognize unrecognized compensation cost (in years)		1 year
Restricted and Performance Restricted Shares
Restricted Shares [Roll Forward]
Vested (in shares)		(2,337,963)
Unvested award balance at end of period (in shares)		6,847,848
Restricted Shares, Additional Disclosures [Abstract]
Number of restricted shares surrendered by employees (in shares)		1,004,950
Aggregate value of restricted shares surrendered by employees		$ 19,141
Restricted Stock
Restricted Shares [Roll Forward]
Unvested award balance at beginning of period (in shares)		5,314,870
Granted (in shares)		1,747,870
Vested (in shares)		(1,598,363)	(889,156)
Awards forfeited (in shares)		(496,629)
Unvested award balance at end of period (in shares)		4,967,748	5,314,870
Restricted Stock | Cablevision and AMC Networks
Restricted Shares, Additional Disclosures [Abstract]
Number of restricted shares surrendered by employees (in shares)			365,130
Aggregate value of restricted shares surrendered by employees			$ 6,608
Performance Based Restricted Stock
Restricted Shares [Roll Forward]
Unvested award balance at beginning of period (in shares)		2,035,300
Granted (in shares)		584,400
Vested (in shares)		(739,600)
Awards forfeited (in shares)		0
Unvested award balance at end of period (in shares)		1,880,100	2,035,300
Performance Shares
Restricted Shares [Roll Forward]
Unvested award balance at beginning of period (in shares)	[1]	0
Granted (in shares)	[1]	1,851,700
Vested (in shares)	[1]	0
Awards forfeited (in shares)	[1]	(79,270)
Unvested award balance at end of period (in shares)	[1]	1,772,430	0
Restricted Shares, Additional Disclosures [Abstract]
Share-based compensation arrangement by share-based payment award, purchase price of common stock (percent)		150.00%
Restricted Stock and Restricted Stock Units
Restricted Shares, Weighted Average Fair Value at Date of Grant [Roll Forward]
Unvested award balance at beginning of period, weighted average fair value per share at date of grant (in dollars per share)		$ 15.46
Granted, weighted average fair value per share at date of grant (in dollars per share)		19.43
Vested, weighted average fair value per share at date of grant (in dollars per share)		14.48
Awards forfeited, weighted average fair value per share at date of grant (in dollars per share)		17.28
Unvested award balance at end of period, weighted average fair value per share at date of grant (in dollars per share)		$ 17.53	$ 15.46

[1] The PSUs entitle the employee to shares of CNYG common stock up to 150% of the number of PSUs granted depending on the level of achievement of the specified performance criteria. If the minimum performance threshold is not met, no shares will be issued. Accrued dividends are paid to the extent that a PSU vests and the related stock is issued.