SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Common Stock of Cablevision (Details)		12 Months Ended
		Dec. 31, 2015 Vote shares	Dec. 31, 2014 shares	Dec. 31, 2013 shares
CNYG Class A Common Stock
Common Stock of Cablevision [Abstract]
Number of votes per share of common stock | Vote		1
Number of shares of common stock issued upon conversion (in shares)		1
Percentage of Board of Directors stockholders are entitled to elect (in hundredths)		25.00%
Common Stock Outstanding [Roll Forward]
Balance at beginning of period (in shares)		220,219,935	213,598,590	210,561,118
Employee and non-employee director stock transactions (in shares)	[1]	2,352,275	6,621,345	3,037,472
Balance at end of period (in shares)		222,572,210	220,219,935	213,598,590
CNYG Class B Common Stock
Common Stock of Cablevision [Abstract]
Number of votes per share of common stock | Vote		10
Number of shares of common stock converted (in shares)		1
Common Stock Outstanding [Roll Forward]
Balance at beginning of period (in shares)		54,137,673	54,137,673	54,137,673
Employee and non-employee director stock transactions (in shares)	[1]	0	0	0
Balance at end of period (in shares)		54,137,673	54,137,673	54,137,673

[1] Primarily includes issuances of common stock in connection with employee and non-employee director exercises of stock options and restricted shares granted to employees, offset by shares acquired by the Company in connection with the fulfillment of employees' statutory tax withholding obligation for applicable income and other employment taxes and forfeited employee restricted shares.