Quarterly report pursuant to Section 13 or 15(d)

Equity-Based Compensation (Details 4)

v2.4.1.9
Equity-Based Compensation (Details 4) (USD $)
0 Months Ended 3 Months Ended
Apr. 15, 2015
Mar. 31, 2015
Aggregate intrinsic value    
Weighted average period for recognizing unrecognized stock-based compensation expense   2 years 3 months 18 days
Antero Midstream Partners Phantom and Restricted Unit Awards    
Number of units    
Total granted and unvested at the beginning of the period (in shares)   2,381,440us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= ar_AnteroMidstreamPartnersPhantomAndRestrictedUnitAwardsMember
Forfeited (in shares)   (21,940)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= ar_AnteroMidstreamPartnersPhantomAndRestrictedUnitAwardsMember
Total awarded and unvested at the end of the period (in shares)   2,359,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= ar_AnteroMidstreamPartnersPhantomAndRestrictedUnitAwardsMember
Weighted average grant date fair value    
Total granted and unvested at the beginning of the period (in dollars per share)   29.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ar_AnteroMidstreamPartnersPhantomAndRestrictedUnitAwardsMember
Forfeited (in dollars per share)   29.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ar_AnteroMidstreamPartnersPhantomAndRestrictedUnitAwardsMember
Total awarded and unvested at the end of the period (in dollars per share)   29.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ar_AnteroMidstreamPartnersPhantomAndRestrictedUnitAwardsMember
Aggregate intrinsic value    
Outstanding at the beginning of the period   65,490,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= ar_AnteroMidstreamPartnersPhantomAndRestrictedUnitAwardsMember
Outstanding at the end of the period   57,076,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= ar_AnteroMidstreamPartnersPhantomAndRestrictedUnitAwardsMember
Unamortized expenses not yet recognized   61,600,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= ar_AnteroMidstreamPartnersPhantomAndRestrictedUnitAwardsMember
Weighted average period for recognizing unrecognized stock-based compensation expense   3 years 7 months 6 days
Restricted units    
Aggregate intrinsic value    
Weighted average period for recognizing unrecognized stock-based compensation expense 4 years 3 years