Document and Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 30, 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 Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2015
CNYG Class A Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		221,448,607
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 Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		17,631,479