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Consolidated Statements of Equity (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Class of Stock [Line Items]  
Net income and comprehensive income $ 15,648us-gaap_IncomeLossAttributableToParent
Equity-based compensation 4,623us-gaap_ShareBasedCompensation
Distribution to unitholders (14,322)us-gaap_PartnersCapitalAccountDistributions
Net income (loss) and comprehensive income (loss) 15,648us-gaap_NetIncomeLossAllocatedToLimitedPartners
Balance 1,348,408us-gaap_PartnersCapital
Common Unitholders Public [Member]  
Class of Stock [Line Items]  
Net income and comprehensive income 4,740us-gaap_IncomeLossAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= am_CommonUnitholdersPublicMember
Equity-based compensation 1,122us-gaap_ShareBasedCompensation
/ us-gaap_StatementClassOfStockAxis
= am_CommonUnitholdersPublicMember
Distribution to unitholders (4,338)us-gaap_PartnersCapitalAccountDistributions
/ us-gaap_StatementClassOfStockAxis
= am_CommonUnitholdersPublicMember
Balance 1,091,561us-gaap_PartnersCapital
/ us-gaap_StatementClassOfStockAxis
= am_CommonUnitholdersPublicMember
Common Unitholders Antero [Member]  
Class of Stock [Line Items]  
Net income and comprehensive income 3,084us-gaap_IncomeLossAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= am_CommonUnitholdersAnteroMember
Equity-based compensation 1,648us-gaap_ShareBasedCompensation
/ us-gaap_StatementClassOfStockAxis
= am_CommonUnitholdersAnteroMember
Distribution to unitholders (2,823)us-gaap_PartnersCapitalAccountDistributions
/ us-gaap_StatementClassOfStockAxis
= am_CommonUnitholdersAnteroMember
Balance 73,574us-gaap_PartnersCapital
/ us-gaap_StatementClassOfStockAxis
= am_CommonUnitholdersAnteroMember
Subordinated Unitholder Antero [Member]  
Class of Stock [Line Items]  
Net income and comprehensive income 7,824us-gaap_IncomeLossAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= am_SubordinatedUnitholderAnteroMember
Equity-based compensation 1,853us-gaap_ShareBasedCompensation
/ us-gaap_StatementClassOfStockAxis
= am_SubordinatedUnitholderAnteroMember
Distribution to unitholders (7,161)us-gaap_PartnersCapitalAccountDistributions
/ us-gaap_StatementClassOfStockAxis
= am_SubordinatedUnitholderAnteroMember
Balance $ 183,273us-gaap_PartnersCapital
/ us-gaap_StatementClassOfStockAxis
= am_SubordinatedUnitholderAnteroMember