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Transactions with Affiliates (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Allocation of costs    
General and administrative expense $ 3.8us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty $ 8.6us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
Agreements    
Term of agreement with Antero 20 years  
Antero Midstream Partners LP    
Allocation of costs    
Direct labor expenses $ 0.7us-gaap_CostOfServicesDirectLabor
/ dei_LegalEntityAxis
= am_AnteroMidstreamPartnersLpMember		 $ 0.2us-gaap_CostOfServicesDirectLabor
/ dei_LegalEntityAxis
= am_AnteroMidstreamPartnersLpMember