Quarterly report pursuant to Section 13 or 15(d)

Equity-Based Compensation (Details 2)

v2.4.1.9
Equity-Based Compensation (Details 2) (USD $)
0 Months Ended 3 Months Ended
Apr. 15, 2015
Mar. 31, 2015
Apr. 15, 2015
Aggregate intrinsic value      
Weighted average period for recognizing unrecognized stock-based compensation expense   2 years 3 months 18 days  
Restricted Stock and Restricted Stock Unit      
Number of shares      
Total granted and unvested at the beginning of the period (in shares)   1,983,673us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= ar_RestrictedStockAndRestrictedStockUnitMember
 
Granted (in shares)   53,386us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= ar_RestrictedStockAndRestrictedStockUnitMember
 
Vested (in shares)   (2,617)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= ar_RestrictedStockAndRestrictedStockUnitMember
 
Forfeited (in shares)   (320)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= ar_RestrictedStockAndRestrictedStockUnitMember
 
Total awarded and unvested at the end of the period (in shares)   2,034,122us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= ar_RestrictedStockAndRestrictedStockUnitMember
 
Weighted average grant date fair value      
Total granted and unvested at the beginning of the period (in dollars per share)   $ 64.71us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ar_RestrictedStockAndRestrictedStockUnitMember
 
Granted (in dollars per share)   $ 35.18us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ar_RestrictedStockAndRestrictedStockUnitMember
 
Vested (in dollars per share)   $ 60.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ar_RestrictedStockAndRestrictedStockUnitMember
 
Forfeited (in dollars per share)   $ 37.52us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ar_RestrictedStockAndRestrictedStockUnitMember
 
Total awarded and unvested at the end of the period (in dollars per share)   $ 63.94us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ar_RestrictedStockAndRestrictedStockUnitMember
 
Aggregate intrinsic value      
Total awarded and unvested at the beginning of the period   $ 80,497,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested
/ us-gaap_AwardTypeAxis
= ar_RestrictedStockAndRestrictedStockUnitMember
 
Total awarded and unvested at the end of the period   71,845,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested
/ us-gaap_AwardTypeAxis
= ar_RestrictedStockAndRestrictedStockUnitMember
 
Restricted units      
Aggregate intrinsic value      
Unrecognized stock-based compensation expense $ 33.4us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
$ 97,200,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
$ 33.4us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Weighted average period for recognizing unrecognized stock-based compensation expense 4 years 3 years