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DEBT, Senior Notes and Debentures (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
May 31, 2014
Sep. 30, 2012
Senior Notes and Debentures [Abstract]        
Carrying amount $ 5,855,867,000us-gaap_LongTermDebt $ 5,138,515,000us-gaap_LongTermDebt    
CSC Holdings, LLC        
Senior Notes and Debentures [Abstract]        
Carrying amount 3,062,126,000us-gaap_LongTermDebt
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= us-gaap_SubsidiariesMember		 2,309,403,000us-gaap_LongTermDebt
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CSC Holdings, LLC | Debentures | 7.875% Debentures due February 2018        
Senior Notes and Debentures [Abstract]        
Issuer CSC Holdings (a)(c)      
Date issued Feb. 06, 1998 [1],[2]      
Maturity date Feb. 15, 2018 [1],[2]      
Interest rate (in hundredths) 7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= cvc_DebenturesMember		 [1],[2]      
Issue Amount 300,000,000us-gaap_DebtInstrumentFaceAmount
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= us-gaap_SubsidiariesMember
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= cvc_DebenturesMember		 [1],[2]      
Carrying amount 299,464,000us-gaap_LongTermDebt
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= cvc_DueFebruary152018Member
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= us-gaap_SubsidiariesMember
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= cvc_DebenturesMember		 [1],[2] 299,293,000us-gaap_LongTermDebt
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= cvc_DueFebruary152018Member
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= cvc_DebenturesMember		 [1],[2]    
CSC Holdings, LLC | Debentures | 7.625% Debentures due July 2018        
Senior Notes and Debentures [Abstract]        
Issuer CSC Holdings (a)(c)      
Date issued Jul. 21, 1998 [1],[2]      
Maturity date Jul. 15, 2018 [1],[2]      
Interest rate (in hundredths) 7.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= cvc_DebenturesMember		 [1],[2]      
Issue Amount 500,000,000us-gaap_DebtInstrumentFaceAmount
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= cvc_DueJuly152018Member
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= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= cvc_DebenturesMember		 [1],[2]      
Carrying amount 499,912,000us-gaap_LongTermDebt
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= cvc_DueJuly152018Member
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= us-gaap_SubsidiariesMember
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= cvc_DebenturesMember		 [1],[2] 499,887,000us-gaap_LongTermDebt
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= cvc_DebenturesMember		 [1],[2]    
CSC Holdings, LLC | Senior Notes | Senior 8.625% Notes due February 2019        
Senior Notes and Debentures [Abstract]        
Issuer CSC Holdings (b)(c)      
Date issued Feb. 12, 2009 [1],[3]      
Maturity date Feb. 15, 2019 [1],[3]      
Interest rate (in hundredths) 8.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= us-gaap_SeniorNotesMember		 [1],[3]      
Issue Amount 526,000,000us-gaap_DebtInstrumentFaceAmount
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/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 [1],[3]      
Carrying amount 512,750,000us-gaap_LongTermDebt
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= us-gaap_SeniorNotesMember		 [1],[3] 510,223,000us-gaap_LongTermDebt
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CSC Holdings, LLC | Senior Notes | Senior 6.75% Notes due November 2021        
Senior Notes and Debentures [Abstract]        
Issuer CSC Holdings (b)      
Date issued Nov. 15, 2011 [3]      
Maturity date Nov. 15, 2021 [3]      
Interest rate (in hundredths) 6.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
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Issue Amount 1,000,000,000us-gaap_DebtInstrumentFaceAmount
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Carrying amount 1,000,000,000us-gaap_LongTermDebt
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= us-gaap_SeniorNotesMember		 [3] 1,000,000,000us-gaap_LongTermDebt
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CSC Holdings, LLC | Senior Notes | Senior 5.25% Notes due June 1, 2024        
Senior Notes and Debentures [Abstract]        
Issuer CSC Holdings (b)      
Date issued May 23, 2014 [3]      
Maturity date Jun. 01, 2024 [3]      
Interest rate (in hundredths) 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= us-gaap_SeniorNotesMember		 [3]      
Issue Amount 750,000,000us-gaap_DebtInstrumentFaceAmount
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= us-gaap_SeniorNotesMember		 [3]   750,000,000us-gaap_DebtInstrumentFaceAmount
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Carrying amount 750,000,000us-gaap_LongTermDebt
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Cablevision Systems Corporation        
Senior Notes and Debentures [Abstract]        
Senior notes due to Newsday 611,455,000us-gaap_NotesPayableRelatedPartiesNoncurrent
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Cablevision Systems Corporation | Senior Notes | Senior 8.625% Notes due September 2017        
Senior Notes and Debentures [Abstract]        
Issuer Cablevision (b)(c)      
Date issued Sep. 23, 2009 [1],[3]      
Maturity date Sep. 15, 2017 [1],[3]      
Interest rate (in hundredths) 8.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= us-gaap_SeniorNotesMember		 [1],[3]      
Issue Amount 900,000,000us-gaap_DebtInstrumentFaceAmount
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= us-gaap_SeniorNotesMember		 [1],[3]      
Carrying amount 894,717,000us-gaap_LongTermDebt
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= us-gaap_SeniorNotesMember		 [1],[3] 893,057,000us-gaap_LongTermDebt
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Cablevision Systems Corporation | Senior Notes | Senior 7.75% Notes due April 2018        
Senior Notes and Debentures [Abstract]        
Issuer Cablevision (b)      
Date issued Apr. 15, 2010 [3]      
Maturity date Apr. 15, 2018 [3]      
Interest rate (in hundredths) 7.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
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Issue Amount 750,000,000us-gaap_DebtInstrumentFaceAmount
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Carrying amount 750,000,000us-gaap_LongTermDebt
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Senior notes due to Newsday 345,238,000us-gaap_NotesPayableRelatedPartiesNoncurrent
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Cablevision Systems Corporation | Senior Notes | Senior 8% Notes due April 2020        
Senior Notes and Debentures [Abstract]        
Issuer Cablevision (b)      
Date issued Apr. 15, 2010 [3]      
Maturity date Apr. 15, 2020 [3]      
Interest rate (in hundredths) 8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
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Issue Amount 500,000,000us-gaap_DebtInstrumentFaceAmount
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Carrying amount 500,000,000us-gaap_LongTermDebt
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Senior notes due to Newsday 266,217,000us-gaap_NotesPayableRelatedPartiesNoncurrent
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Cablevision Systems Corporation | Senior Notes | Senior 5.875% Notes due September 2022        
Senior Notes and Debentures [Abstract]        
Issuer Cablevision (b)      
Date issued Sep. 27, 2012 [3]      
Maturity date Sep. 15, 2022 [3]      
Interest rate (in hundredths) 5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
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Issue Amount 750,000,000us-gaap_DebtInstrumentFaceAmount
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Carrying amount $ 649,024,000us-gaap_LongTermDebt
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[1] The carrying amount of the senior notes is net of the unamortized original issue discount.
[2] The debentures are not redeemable by the Company prior to maturity.
[3] The Company may redeem some or all of the notes at any time at a specified "make-whole" price plus accrued and unpaid interest to the redemption date.