Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Jun. 30, 2014	Feb. 19, 2015
Entity Information [Line Items]
Entity Registrant Name	CABLEVISION SYSTEMS CORP /NY
Entity Central Index Key	0001053112
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float		$ 3,648,276,512
CNYG Class A Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding			220,077,601
CNYG Class B Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding			54,137,673
CSC Holdings, LLC
Entity Information [Line Items]
Entity Registrant Name	CSC HOLDINGS LLC
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding			17,631,479
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes