Annual report pursuant to Section 13 and 15(d)

Transactions with Affiliates (Details)

v2.4.1.9
Transactions with Affiliates (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Allocation of costs      
General and administrative expense $ 22.0us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty $ 23.1us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty $ 2.9us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
Antero      
Agreements      
Term of agreement with Antero 20 years    
Low pressure gathering fee 0.30am_GatheringAndCompressionAgreementLowPressureGatheringFeeSubjectToCpiBasedAdjustments
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= am_AnteroResourcesCorporationMember
   
High pressure gathering fee 0.18am_GatheringAndCompressionAgreementHighPressureGatheringFeeSubjectToCpiBasedAdjustments
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= am_AnteroResourcesCorporationMember
   
Compression fee 0.18am_GatheringAndCompressionAgreementCompressionFeeSubjectToCpiBasedAdjustments
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= am_AnteroResourcesCorporationMember
   
Condensate gathering fee 4.00am_GatheringAndCompressionAgreementCondensateGatheringFeeSubjectToCpiBasedAdjustments
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= am_AnteroResourcesCorporationMember
   
Antero | High Pressure Lines (Member)      
Agreements      
Minimum volume commitment that require Antero to pay 75.00%am_GatheringAndCompressionAgreementMinimumVolumeCommitmentThatRequireAnteroToPay
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= am_HighPressureLinesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= am_AnteroResourcesCorporationMember
   
Antero | Compressor stations (Member)      
Agreements      
Minimum volume commitment that require Antero to pay 70.00%am_GatheringAndCompressionAgreementMinimumVolumeCommitmentThatRequireAnteroToPay
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= am_CompressorStationsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= am_AnteroResourcesCorporationMember
   
Antero Midstream Partners LP      
Allocation of costs      
Direct labor expenses $ 1.5us-gaap_CostOfServicesDirectLabor
/ dei_LegalEntityAxis
= am_AnteroMidstreamPartnersLpMember