SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands												12 Months Ended
	Aug. 06, 2015	May. 01, 2015	Feb. 24, 2015	Nov. 05, 2014	Jul. 29, 2014	May. 06, 2014	Feb. 25, 2014	Nov. 06, 2013	Jul. 30, 2013	May. 07, 2013	Feb. 26, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Dividends [Abstract]
Dividends paid by Cablevision												$ 125,170	$ 160,545	$ 159,709
Maximum dividends to be paid when, and if, restriction lapse on restricted shares outstanding												7,901
CSC Holdings, LLC
Dividends [Abstract]
Distributions paid to Cablevision												343,164	396,382	501,224
Restricted Stock
Dividends [Abstract]
Dividends paid by Cablevision												$ 3,935	$ 1,548	$ 3,092
Dividend Declared 2015 Q3 | CNYG Class A Common Stock
Dividends [Abstract]
Dividend, declaration date	Aug. 06, 2015
Dividend per share (in dollars per share)	$ 0.15
Dividend, record date	Aug. 21, 2015
Dividend, payment date	Sep. 10, 2015
Dividend Declared 2015 Q3 | CNYG Class B Common Stock
Dividends [Abstract]
Dividend, declaration date	Aug. 06, 2015
Dividend per share (in dollars per share)	$ 0.15
Dividend, record date	Aug. 21, 2015
Dividend, payment date	Sep. 10, 2015
Dividend Declared 2015 Q2 | CNYG Class A Common Stock
Dividends [Abstract]
Dividend, declaration date		May 01, 2015
Dividend per share (in dollars per share)		$ 0.15
Dividend, record date		May 22, 2015
Dividend, payment date		Jun. 12, 2015
Dividend Declared 2015 Q2 | CNYG Class B Common Stock
Dividends [Abstract]
Dividend, declaration date		May 01, 2015
Dividend per share (in dollars per share)		$ 0.15
Dividend, record date		May 22, 2015
Dividend, payment date		Jun. 12, 2015
Dividend Declared 2015 Q1 | CNYG Class A Common Stock
Dividends [Abstract]
Dividend, declaration date			Feb. 24, 2015
Dividend per share (in dollars per share)			$ 0.15
Dividend, record date			Mar. 16, 2015
Dividend, payment date			Apr. 03, 2015
Dividend Declared 2015 Q1 | CNYG Class B Common Stock
Dividends [Abstract]
Dividend, declaration date			Feb. 24, 2015
Dividend per share (in dollars per share)			$ 0.15
Dividend, record date			Mar. 16, 2015
Dividend, payment date			Apr. 03, 2015
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 Q4 | CNYG Class B 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 Q3 | CNYG Class B 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 Q2 | CNYG Class B 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 2014 Q1 | CNYG Class B 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 Q4 | CNYG Class B 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 Q3 | CNYG Class B 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 Q2 | CNYG Class B 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 2013 Q1 | CNYG Class B 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