SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Dividends (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 12, 2014	Sep. 05, 2014	Jun. 13, 2014	Apr. 03, 2014	Dec. 13, 2013	Sep. 05, 2013	Jun. 14, 2013	Apr. 03, 2013	Nov. 28, 2012	Sep. 04, 2012	Jun. 01, 2012	Mar. 30, 2012
Dividends [Abstract]
Dividends paid by Cablevision	$ 160,545	$ 159,709	$ 163,872
Maximum dividends to be paid when, and if, restriction lapse on restricted shares outstanding	8,319
CSC Holdings, LLC
Dividends [Abstract]
Distributions paid to Cablevision	396,382	501,224	671,809
Restricted Stock
Dividends [Abstract]
Dividends paid by Cablevision	$ 1,548	$ 3,092	$ 5,987
Dividend Declared 2014 Q4 | CNYG Class A Common Stock
Dividends [Abstract]
Dividend, declaration date	Nov. 05, 2014
Dividend per share (in dollars per share)				$ 0.15
Dividend, record date	Nov. 21, 2014
Dividend, payment date	Dec. 12, 2014
Dividend Declared 2014 Q3 | CNYG Class A Common Stock
Dividends [Abstract]
Dividend, declaration date	Jul. 29, 2014
Dividend per share (in dollars per share)					$ 0.15
Dividend, record date	Aug. 15, 2014
Dividend, payment date	Sep. 05, 2014
Dividend Declared 2014 Q2 | CNYG Class A Common Stock
Dividends [Abstract]
Dividend, declaration date	May 06, 2014
Dividend per share (in dollars per share)						$ 0.15
Dividend, record date	May 23, 2014
Dividend, payment date	Jun. 13, 2014
Dividend Declared 2014 Q1 | CNYG Class A Common Stock
Dividends [Abstract]
Dividend, declaration date	Feb. 25, 2014
Dividend per share (in dollars per share)							$ 0.15
Dividend, record date	Mar. 14, 2014
Dividend, payment date	Apr. 03, 2014
Dividend Declared 2013 Q4 | CNYG Class A Common Stock
Dividends [Abstract]
Dividend, declaration date		Nov. 06, 2013
Dividend per share (in dollars per share)								$ 0.15
Dividend, record date		Nov. 22, 2013
Dividend, payment date		Dec. 13, 2013
Dividend Declared 2013 Q3 | CNYG Class A Common Stock
Dividends [Abstract]
Dividend, declaration date		Jul. 30, 2013
Dividend per share (in dollars per share)									$ 0.15
Dividend, record date		Aug. 15, 2013
Dividend, payment date		Sep. 05, 2013
Dividend Declared 2013 Q2 | CNYG Class A Common Stock
Dividends [Abstract]
Dividend, declaration date		May 07, 2013
Dividend per share (in dollars per share)										$ 0.15
Dividend, record date		May 24, 2013
Dividend, payment date		Jun. 14, 2013
Dividend Declared 2013 Q1 | CNYG Class A Common Stock
Dividends [Abstract]
Dividend, declaration date		Feb. 26, 2013
Dividend per share (in dollars per share)											$ 0.15
Dividend, record date		Mar. 15, 2013
Dividend, payment date		Apr. 03, 2013
Dividend Declared 2012 Q4 | CNYG Class A Common Stock
Dividends [Abstract]
Dividend, declaration date			Oct. 24, 2012
Dividend per share (in dollars per share)												$ 0.15
Dividend, record date			Nov. 07, 2012
Dividend, payment date			Nov. 28, 2012
Dividend Declared 2012 Q3 | CNYG Class A Common Stock
Dividends [Abstract]
Dividend, declaration date			Aug. 01, 2012
Dividend per share (in dollars per share)													$ 0.15
Dividend, record date			Aug. 14, 2012
Dividend, payment date			Sep. 04, 2012
Dividend Declared 2012 Q2 | CNYG Class A Common Stock
Dividends [Abstract]
Dividend, declaration date			May 01, 2012
Dividend per share (in dollars per share)														$ 0.15
Dividend, record date			May 17, 2012
Dividend, payment date			Jun. 01, 2012
Dividend Declared 2012 Q1 | CNYG Class A Common Stock
Dividends [Abstract]
Dividend, declaration date			Feb. 22, 2012
Dividend per share (in dollars per share)															$ 0.15
Dividend, record date			Mar. 09, 2012
Dividend, payment date			Mar. 30, 2012