SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Common Stock of Cablevision (Details)	12 Months Ended
	Dec. 31, 2014 Vote		Dec. 31, 2013		Dec. 31, 2012
CNYG Class A Common Stock
Common Stock of Cablevision [Abstract]
Number of votes per share of common stock	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)	213,598,590		210,561,118		220,170,261
Employee and non-employee director stock transactions (in shares)	6,621,345	[1]	3,037,472	[1]	3,987,544	[1]
Shares repurchased (in shares)					(13,596,687)
Balance at end of period (in shares)	220,219,935		213,598,590		210,561,118
CNYG Class B Common Stock
Common Stock of Cablevision [Abstract]
Number of votes per share of common stock	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)	0	[1]	0	[1]	0	[1]
Shares repurchased (in shares)					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.