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EQUITY PLANS EQUITY PLANS, Performance Based Restricted Stock Units (Details) (Cablevision Systems Corporation Employee Stock Plan, Performance Based Restricted Stock Units, Performance Criteria Not Yet Satisfied (PSUs))
 1 Months Ended 3 Months Ended
Mar. 31, 2015
Mar. 31, 2015
Cablevision Systems Corporation Employee Stock Plan | Performance Based Restricted Stock Units, Performance Criteria Not Yet Satisfied (PSUs)
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (in shares) 1,816,660us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= cvc_CablevisionSystemsCorporationEmployeeStockPlanMember		  
Vesting period   3 years
Purchase price of common stock, percent   150.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= cvc_CablevisionSystemsCorporationEmployeeStockPlanMember