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FAIR VALUE MEASUREMENT (Details) (USD $)
In Thousands
Jun. 30, 2011
Dec. 31, 2010
Assets [Abstract]    
Money market funds $ 314,544 $ 259,463
Investment securities 105 101
Investment securities pledged as collateral 544,242 471,864
Derivative contracts [Abstract]    
Prepaid forward contracts 7,234  
Liabilities under derivative contracts [Abstract]    
Prepaid forward contracts 64,200 59,300
Interest rate swap contracts 117,114 167,278
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Assets [Abstract]    
Money market funds 314,544 259,463
Investment securities 105 101
Investment securities pledged as collateral 544,242 471,864
Derivative contracts [Abstract]    
Prepaid forward contracts 0  
Liabilities under derivative contracts [Abstract]    
Prepaid forward contracts 0 0
Interest rate swap contracts 0 0
Significant Other Observable Inputs (Level 2) [Member]
   
Assets [Abstract]    
Money market funds 0 0
Investment securities 0 0
Investment securities pledged as collateral 0 0
Derivative contracts [Abstract]    
Prepaid forward contracts 7,234  
Liabilities under derivative contracts [Abstract]    
Prepaid forward contracts 64,200 59,300
Interest rate swap contracts 117,114 167,278
Significant Unobservable Inputs (Level 3) [Member]
   
Assets [Abstract]    
Money market funds 0 0
Investment securities 0 0
Investment securities pledged as collateral 0 0
Derivative contracts [Abstract]    
Prepaid forward contracts 0  
Liabilities under derivative contracts [Abstract]    
Prepaid forward contracts 0 0
Interest rate swap contracts 0 0
CSC Holdings, LLC [Member] | Carrying Amount [Member]
   
CSC Holdings notes receivable [Abstract]    
Cablevision senior notes held by Newsday Holdings LLC 753,717 [1] 753,717 [1]
Debt instruments [Abstract]    
Credit facility debt 4,983,270 [2] 5,756,510 [2]
Note payable 739  
Collateralized indebtedness 425,822 352,606
Senior notes and debentures 3,086,215 3,402,505
Total debt instruments 8,496,046 9,511,621
CSC Holdings, LLC [Member] | Estimated Fair Value [Member]
   
CSC Holdings notes receivable [Abstract]    
Cablevision senior notes held by Newsday Holdings LLC 805,339 [1] 795,508 [1]
Debt instruments [Abstract]    
Credit facility debt 5,019,576 [2] 5,802,917 [2]
Note payable 730  
Collateralized indebtedness 421,766 349,853
Senior notes and debentures 3,446,282 3,781,994
Total debt instruments 8,888,354 9,934,764
Cablevision Systems Corporation [Member] | Carrying Amount [Member]
   
Debt instruments [Abstract]    
Senior notes and debentures 2,166,313 2,165,688
Cablevision Systems Corporation [Member] | Estimated Fair Value [Member]
   
Debt instruments [Abstract]    
Senior notes and debentures 2,339,060 2,328,644
Carrying Amount [Member]
   
Debt instruments [Abstract]    
Total debt instruments 10,662,359 11,677,309
Estimated Fair Value [Member]
   
Debt instruments [Abstract]    
Total debt instruments $ 11,227,414 $ 12,263,408
[1] These notes are eliminated at the consolidated Cablevision level.
[2] The carrying value of the Company's credit facility debt, the substantial portion of which bears interest at variable rates approximates its fair value.