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INCOME TAXES (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 1 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Apr. 30, 2015
Income Taxes [Abstract]      
Income tax expense (benefit) $ 37,940us-gaap_IncomeTaxExpenseBenefit $ (26,939)us-gaap_IncomeTaxExpenseBenefit  
Effective tax rate (in hundredths) 41.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations (43.00%)us-gaap_EffectiveIncomeTaxRateContinuingOperations  
Tax benefit from reversal of uncertain tax position liability   (53,132)cvc_IncomeTaxReconciliationReversalOfUncertainTaxPositionLiability  
Effective tax rate absent certain items of tax expense or benefit (in hundredths)   41.00%cvc_EffectiveIncomeTaxRateContinuingOperationsAbsentCertainItemsOfTaxExpenseOrBenefit  
Consolidated federal net operating loss carryforwards 570,000us-gaap_OperatingLossCarryforwards    
CSC Holdings, LLC      
Income Taxes [Abstract]      
Income tax expense (benefit) 67,542us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1,798us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Effective tax rate (in hundredths) 42.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Tax benefit from reversal of uncertain tax position liability   (53,132)cvc_IncomeTaxReconciliationReversalOfUncertainTaxPositionLiability
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Effective tax rate absent certain items of tax expense or benefit (in hundredths)   42.00%cvc_EffectiveIncomeTaxRateContinuingOperationsAbsentCertainItemsOfTaxExpenseOrBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Subsequent Event      
Income Taxes [Line Items]      
Deferred tax on monetization     $ 16,000cvc_DeferredTaxonMonetization
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember