CONSOLIDATED STATEMENTS OF STOCKHOLDERS' DEFICIENCY - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		$ (5,040,690)		$ (5,283,544)	$ (5,040,690)	$ (5,283,544)	$ (5,638,006)
Net income attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC's sole member	$ 32,118	44,633	$ 55,975	89,763	175,449	311,439	465,661
Net income (loss) attributable to noncontrolling interests					(146)	1,007	1,052
Pension and postretirement plan liability adjustments, net of income taxes					4,563	459	(11,931)
Proceeds from exercise of options and issuance of restricted shares					18,687	55,330	18,196
Recognition of equity-based stock compensation arrangements					60,817	44,335	52,777
Treasury stock acquired from forfeiture and acquisition of restricted shares					(19,141)	(6,608)	(12,262)
Tax withholding associated with shares issued for equity-based compensation							(644)
Excess tax benefit on share-based awards					5,694	336	1,280
Dividends on CNYG Class A and CNYG Class B common stock					(124,752)	(162,806)	(160,083)
Adjustments to noncontrolling interests					7,935	(638)	416
Ending Balance	(4,911,584)		(5,040,690)		(4,911,584)	(5,040,690)	(5,283,544)
Common Stock | CNYG Class A Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		3,003		2,925	3,003	2,925	2,878
Net income attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC's sole member					0	0	0
Net income (loss) attributable to noncontrolling interests					0	0	0
Pension and postretirement plan liability adjustments, net of income taxes					0	0	0
Proceeds from exercise of options and issuance of restricted shares					39	78	47
Recognition of equity-based stock compensation arrangements					0	0	0
Treasury stock acquired from forfeiture and acquisition of restricted shares					0	0	0
Tax withholding associated with shares issued for equity-based compensation							0
Excess tax benefit on share-based awards					0	0	0
Dividends on CNYG Class A and CNYG Class B common stock					0	0	0
Adjustments to noncontrolling interests					0	0	0
Ending Balance	3,042		3,003		3,042	3,003	2,925
Common Stock | CNYG Class B Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		541		541	541	541	541
Net income attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC's sole member					0	0	0
Net income (loss) attributable to noncontrolling interests					0	0	0
Pension and postretirement plan liability adjustments, net of income taxes					0	0	0
Proceeds from exercise of options and issuance of restricted shares					0	0	0
Recognition of equity-based stock compensation arrangements					0	0	0
Treasury stock acquired from forfeiture and acquisition of restricted shares					0	0	0
Tax withholding associated with shares issued for equity-based compensation							0
Excess tax benefit on share-based awards					0	0	0
Dividends on CNYG Class A and CNYG Class B common stock					0	0	0
Adjustments to noncontrolling interests					0	0	0
Ending Balance	541		541		541	541	541
Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		823,103		885,601	823,103	885,601	972,274
Net income attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC's sole member					0	0	0
Net income (loss) attributable to noncontrolling interests					0	0	0
Pension and postretirement plan liability adjustments, net of income taxes					0	0	0
Proceeds from exercise of options and issuance of restricted shares					18,648	55,252	18,149
Recognition of equity-based stock compensation arrangements					60,817	44,335	52,777
Treasury stock acquired from forfeiture and acquisition of restricted shares					5	9	8
Tax withholding associated with shares issued for equity-based compensation							(644)
Excess tax benefit on share-based awards					5,694	336	1,280
Dividends on CNYG Class A and CNYG Class B common stock					(124,752)	(162,806)	(160,083)
Adjustments to noncontrolling interests					8,836	376	1,840
Ending Balance	792,351		823,103		792,351	823,103	885,601
Accumulated Deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		(4,234,860)		(4,546,299)	(4,234,860)	(4,546,299)	(5,011,960)
Net income attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC's sole member					175,449	311,439	465,661
Net income (loss) attributable to noncontrolling interests					0	0	0
Pension and postretirement plan liability adjustments, net of income taxes					0	0	0
Proceeds from exercise of options and issuance of restricted shares					0	0	0
Recognition of equity-based stock compensation arrangements					0	0	0
Treasury stock acquired from forfeiture and acquisition of restricted shares					0	0	0
Tax withholding associated with shares issued for equity-based compensation							0
Excess tax benefit on share-based awards					0	0	0
Dividends on CNYG Class A and CNYG Class B common stock					0	0	0
Adjustments to noncontrolling interests					0	0	0
Ending Balance	(4,059,411)		(4,234,860)		(4,059,411)	(4,234,860)	(4,546,299)
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		(1,591,021)		(1,584,404)	(1,591,021)	(1,584,404)	(1,572,134)
Net income attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC's sole member					0	0	0
Net income (loss) attributable to noncontrolling interests					0	0	0
Pension and postretirement plan liability adjustments, net of income taxes					0	0	0
Proceeds from exercise of options and issuance of restricted shares					0	0	0
Recognition of equity-based stock compensation arrangements					0	0	0
Treasury stock acquired from forfeiture and acquisition of restricted shares					(19,146)	(6,617)	(12,270)
Tax withholding associated with shares issued for equity-based compensation							0
Excess tax benefit on share-based awards					0	0	0
Dividends on CNYG Class A and CNYG Class B common stock					0	0	0
Adjustments to noncontrolling interests					0	0	0
Ending Balance	(1,610,167)		(1,591,021)		(1,610,167)	(1,591,021)	(1,584,404)
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		(42,235)		(42,694)	(42,235)	(42,694)	(30,763)
Net income attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC's sole member					0	0	0
Net income (loss) attributable to noncontrolling interests					0	0	0
Pension and postretirement plan liability adjustments, net of income taxes					4,563	459	(11,931)
Proceeds from exercise of options and issuance of restricted shares					0	0	0
Recognition of equity-based stock compensation arrangements					0	0	0
Treasury stock acquired from forfeiture and acquisition of restricted shares					0	0	0
Tax withholding associated with shares issued for equity-based compensation							0
Excess tax benefit on share-based awards					0	0	0
Dividends on CNYG Class A and CNYG Class B common stock					0	0	0
Adjustments to noncontrolling interests					0	0	0
Ending Balance	(37,672)		(42,235)		(37,672)	(42,235)	(42,694)
Total Stockholders'/Member's Deficiency
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		(5,041,469)		(5,284,330)	(5,041,469)	(5,284,330)	(5,639,164)
Net income attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC's sole member					175,449	311,439	465,661
Net income (loss) attributable to noncontrolling interests					0	0	0
Pension and postretirement plan liability adjustments, net of income taxes					4,563	459	(11,931)
Proceeds from exercise of options and issuance of restricted shares					18,687	55,330	18,196
Recognition of equity-based stock compensation arrangements					60,817	44,335	52,777
Treasury stock acquired from forfeiture and acquisition of restricted shares					(19,141)	(6,608)	(12,262)
Tax withholding associated with shares issued for equity-based compensation							(644)
Excess tax benefit on share-based awards					5,694	336	1,280
Dividends on CNYG Class A and CNYG Class B common stock					(124,752)	(162,806)	(160,083)
Adjustments to noncontrolling interests					8,836	376	1,840
Ending Balance	(4,911,316)		(5,041,469)		(4,911,316)	(5,041,469)	(5,284,330)
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		779		786	779	786	1,158
Net income attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC's sole member					0	0	0
Net income (loss) attributable to noncontrolling interests					(146)	1,007	1,052
Pension and postretirement plan liability adjustments, net of income taxes					0	0	0
Proceeds from exercise of options and issuance of restricted shares					0	0	0
Recognition of equity-based stock compensation arrangements					0	0	0
Treasury stock acquired from forfeiture and acquisition of restricted shares					0	0	0
Tax withholding associated with shares issued for equity-based compensation							0
Excess tax benefit on share-based awards					0	0	0
Dividends on CNYG Class A and CNYG Class B common stock					0	0	0
Adjustments to noncontrolling interests					(901)	(1,014)	(1,424)
Ending Balance	(268)		779		(268)	779	786
CSC Holdings, LLC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		(2,527,519)		(2,643,286)	(2,527,519)	(2,643,286)	(2,850,615)
Net income attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC's sole member	73,545	82,668	91,132	129,384	331,852	462,008	620,075
Net income (loss) attributable to noncontrolling interests					(146)	1,007	1,052
Pension and postretirement plan liability adjustments, net of income taxes					4,563	459	(11,931)
Recognition of equity-based stock compensation arrangements					60,817	44,335	52,777
Distributions to Cablevision					(343,164)	(396,382)	(501,224)
Excess tax benefit on share-based awards					14,170	4,978	46,164
Impact of Purchase of Senior Notes held by Newsday Holdings							296
Adjustments to noncontrolling interests					7,935	(638)	712
Ending Balance	(2,451,492)		(2,527,519)		(2,451,492)	(2,527,519)	(2,643,286)
CSC Holdings, LLC | Accumulated Deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		(2,024,065)		(2,486,073)	(2,024,065)	(2,486,073)	(3,106,148)
Net income attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC's sole member					331,852	462,008	620,075
Net income (loss) attributable to noncontrolling interests					0	0	0
Pension and postretirement plan liability adjustments, net of income taxes					0	0	0
Recognition of equity-based stock compensation arrangements					0	0	0
Distributions to Cablevision					(125,618)	0	0
Excess tax benefit on share-based awards					0	0	0
Impact of Purchase of Senior Notes held by Newsday Holdings							0
Adjustments to noncontrolling interests					0	0	0
Ending Balance	(1,817,831)		(2,024,065)		(1,817,831)	(2,024,065)	(2,486,073)
CSC Holdings, LLC | Senior Notes due from Cablevision
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		(611,455)		(611,455)	(611,455)	(611,455)	(753,717)
Net income attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC's sole member					0	0	0
Net income (loss) attributable to noncontrolling interests					0	0	0
Pension and postretirement plan liability adjustments, net of income taxes					0	0	0
Recognition of equity-based stock compensation arrangements					0	0	0
Distributions to Cablevision					0	0	0
Excess tax benefit on share-based awards					0	0	0
Impact of Purchase of Senior Notes held by Newsday Holdings							(142,262)
Adjustments to noncontrolling interests					0	0	0
Ending Balance	(611,455)		(611,455)		(611,455)	(611,455)	(611,455)
CSC Holdings, LLC | Other Member's Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		149,457		496,150	149,457	496,150	1,038,855
Net income attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC's sole member					0	0	0
Net income (loss) attributable to noncontrolling interests					0	0	0
Pension and postretirement plan liability adjustments, net of income taxes					0	0	0
Recognition of equity-based stock compensation arrangements					60,817	44,335	52,777
Distributions to Cablevision					(217,546)	(396,382)	(501,224)
Excess tax benefit on share-based awards					14,170	4,978	46,164
Impact of Purchase of Senior Notes held by Newsday Holdings							142,558
Adjustments to noncontrolling interests					8,836	376	2,136
Ending Balance	15,734		149,457		15,734	149,457	496,150
CSC Holdings, LLC | Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		(42,235)		(42,694)	(42,235)	(42,694)	(30,763)
Net income attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC's sole member					0	0	0
Net income (loss) attributable to noncontrolling interests					0	0	0
Pension and postretirement plan liability adjustments, net of income taxes					4,563	459	(11,931)
Recognition of equity-based stock compensation arrangements					0	0	0
Distributions to Cablevision					0	0	0
Excess tax benefit on share-based awards					0	0	0
Impact of Purchase of Senior Notes held by Newsday Holdings							0
Adjustments to noncontrolling interests					0	0	0
Ending Balance	(37,672)		(42,235)		(37,672)	(42,235)	(42,694)
CSC Holdings, LLC | Total Stockholders'/Member's Deficiency
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		(2,528,298)		(2,644,072)	(2,528,298)	(2,644,072)	(2,851,773)
Net income attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC's sole member					331,852	462,008	620,075
Net income (loss) attributable to noncontrolling interests					0	0	0
Pension and postretirement plan liability adjustments, net of income taxes					4,563	459	(11,931)
Recognition of equity-based stock compensation arrangements					60,817	44,335	52,777
Distributions to Cablevision					(343,164)	(396,382)	(501,224)
Excess tax benefit on share-based awards					14,170	4,978	46,164
Impact of Purchase of Senior Notes held by Newsday Holdings							296
Adjustments to noncontrolling interests					8,836	376	2,136
Ending Balance	(2,451,224)		(2,528,298)		(2,451,224)	(2,528,298)	(2,644,072)
CSC Holdings, LLC | Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		$ 779		$ 786	779	786	1,158
Net income attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC's sole member					0	0	0
Net income (loss) attributable to noncontrolling interests					(146)	1,007	1,052
Pension and postretirement plan liability adjustments, net of income taxes					0	0	0
Recognition of equity-based stock compensation arrangements					0	0	0
Distributions to Cablevision					0	0	0
Excess tax benefit on share-based awards					0	0	0
Impact of Purchase of Senior Notes held by Newsday Holdings							0
Adjustments to noncontrolling interests					(901)	(1,014)	(1,424)
Ending Balance	$ (268)		$ 779		$ (268)	$ 779	$ 786