Document And Entity Information (USD $)	12 Months Ended				12 Months Ended
	Dec. 31, 2011	Jun. 30, 2011	Feb. 23, 2012 CNYG Class A Common Stock [Member]	Feb. 23, 2012 CNYG Class B Common Stock [Member]	Dec. 31, 2011 CSC Holdings, LLC [Member]	Feb. 23, 2012 CSC Holdings, LLC [Member]
Entity Information [Line Items]
Entity Registrant Name	CABLEVISION SYSTEMS CORP /NY				CSC HOLDINGS LLC
Entity Central Index Key	0001053112				0000784681
Current Fiscal Year End Date	--12-31				--12-31
Entity Well-known Seasoned Issuer	Yes				No
Entity Voluntary Filers	No				No
Entity Current Reporting Status	Yes				Yes
Entity Filer Category	Large Accelerated Filer				Non-accelerated Filer
Entity Public Float		$ 8,031,312,425
Entity Common Stock, Shares Outstanding			220,164,656	54,137,673		14,432,750
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2011