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Segment Information (Summary Of Inter-Segment Eliminations) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]    
Revenues, net $ 668,682us-gaap_SalesRevenueNet $ 524,554us-gaap_SalesRevenueNet
Intersegment Eliminations [Member]    
Segment Reporting Information [Line Items]    
Revenues, net (521)us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember		 (704)us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
Intersegment Eliminations [Member] | National Networks [Member]    
Segment Reporting Information [Line Items]    
Revenues, net (452)us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementBusinessSegmentsAxis
= amcx_NationalNetworksMember		 (674)us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementBusinessSegmentsAxis
= amcx_NationalNetworksMember
Intersegment Eliminations [Member] | International And Other [Member]    
Segment Reporting Information [Line Items]    
Revenues, net $ (69)us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementBusinessSegmentsAxis
= amcx_InternationalAndOtherMember		 $ (30)us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementBusinessSegmentsAxis
= amcx_InternationalAndOtherMember