Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt (Details)

v2.4.1.9
Long-Term Debt (Details) (USD $)
0 Months Ended 3 Months Ended 27 Months Ended 0 Months Ended 3 Months Ended
Sep. 18, 2014
Mar. 31, 2015
Mar. 31, 2015
Feb. 04, 2013
Mar. 31, 2014
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Nov. 19, 2012
Nov. 05, 2013
May 06, 2014
Mar. 17, 2015
Long- term Debt                        
Long-term debt   $ 4,172,295,000us-gaap_NotesPayable $ 4,172,295,000us-gaap_NotesPayable     $ 4,362,550,000us-gaap_NotesPayable            
Long-term debt   4,172,295,000us-gaap_LongTermNotesPayable 4,172,295,000us-gaap_LongTermNotesPayable     4,362,550,000us-gaap_LongTermNotesPayable            
Senior notes issued 500,000,000us-gaap_DebtInstrumentFaceAmount                      
Issue price as percentage of par value 100.50%ar_DebtInstrumentIssuePriceAsPercentageOfFaceValue                      
Midstream Credit Facility                        
Long- term Debt                        
Maximum amount of the Credit Facility   1,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= ar_MidstreamCreditFacilityMember
1,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= ar_MidstreamCreditFacilityMember
                 
Lender commitments             200,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= ar_MidstreamCreditFacilityMember
         
Description of variable rate basis   LIBOR or the prime rate,                    
Midstream Credit Facility | Minimum                        
Long- term Debt                        
Commitment fees on the unused portion (as a percent)   0.25%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_LongtermDebtTypeAxis
= ar_MidstreamCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
                   
Midstream Credit Facility | Maximum                        
Long- term Debt                        
Commitment fees on the unused portion (as a percent)   0.375%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_LongtermDebtTypeAxis
= ar_MidstreamCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
                   
Bank credit facility                        
Long- term Debt                        
Long-term debt   790,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
790,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
    1,730,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
           
Current borrowing base   4,000,000,000ar_LineOfCreditFacilityBorrowingBase
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
4,000,000,000ar_LineOfCreditFacilityBorrowingBase
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
                 
Current borrowing base before amendment   4,000,000,000ar_LineOfCreditFacilityBorrowingBaseBeforeAmendment
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
4,000,000,000ar_LineOfCreditFacilityBorrowingBaseBeforeAmendment
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
                 
Outstanding balance   790,000,000us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
790,000,000us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
        1,730,000,000us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
       
Weighted average interest rate (as a percent)   1.94%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
1.94%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
    2.06%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
           
Outstanding letters of credit   474,000,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
474,000,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
    387,000,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
           
Description of variable rate basis     LIBOR or the prime rate                  
Bank credit facility | Minimum                        
Long- term Debt                        
Commitment fees on the unused portion (as a percent)   0.375%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
                   
Bank credit facility | Maximum                        
Long- term Debt                        
Commitment fees on the unused portion (as a percent)   0.50%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
                   
6.00% senior notes due 2020                        
Long- term Debt                        
Long-term debt   525,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes6.00PercentDue2020Member
525,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes6.00PercentDue2020Member
    525,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes6.00PercentDue2020Member
           
Interest rate (as a percent)                 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes6.00PercentDue2020Member
     
Senior notes issued       225,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes6.00PercentDue2020Member
        300,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes6.00PercentDue2020Member
     
Issue price as percentage of par value       103.00%ar_DebtInstrumentIssuePriceAsPercentageOfFaceValue
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes6.00PercentDue2020Member
               
Percentage of principal amount at which notes may be required to be repurchased in event of change of control   101.00%ar_DebtInstrumentRedemptionPriceUponChangeOfControlAsPercentageOfPrincipalAmount
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes6.00PercentDue2020Member
                   
6.00% senior notes due 2020 | On or after December 1, 2018                        
Long- term Debt                        
Percentage of the principal amount of the debt instrument redeemed   100.00%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= ar_DebtInstrumentRedemptionPeriodOnOrAfter1December2018Member
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes6.00PercentDue2020Member
                   
6.00% senior notes due 2020 | On or before December 1, 2015                        
Long- term Debt                        
Percentage of the principal amount of the debt instrument redeemed   104.50%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= ar_DebtInstrumentRedemptionPeriodOnOrBefore1December2015Member
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes6.00PercentDue2020Member
                   
Percentage of the principal amount of the debt instrument which the entity may redeem with the proceeds from certain equity offerings   35.00%ar_LongTermDebtRedemptionWithNetProceedsFromEquityOfferingsAsPercentageOfPrincipalAmount
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= ar_DebtInstrumentRedemptionPeriodOnOrBefore1December2015Member
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes6.00PercentDue2020Member
                   
Redemption price of the debt instrument if redeemed with the proceeds of certain equity offerings (as a percent)   106.00%ar_LongTermDebtRedemptionPriceWithNetProceedsFromEquityOfferingsAsPercentageOfPrincipalAmount
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= ar_DebtInstrumentRedemptionPeriodOnOrBefore1December2015Member
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes6.00PercentDue2020Member
                   
6.00% senior notes due 2020 | Prior to December 1, 2015                        
Long- term Debt                        
Redemption price of the debt instrument in the event of change of control (as a percent)   100.00%ar_LongTermDebtRedemptionPriceDueToChangeOfControlAsPercentageOfPrincipalAmount
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= ar_DebtInstrumentRedemptionPeriodBefore1December2015Member
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes6.00PercentDue2020Member
                   
5.375% senior notes due 2021                        
Long- term Debt                        
Long-term debt   1,000,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5.375PercentDue2021Member
1,000,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5.375PercentDue2021Member
    1,000,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5.375PercentDue2021Member
           
Interest rate (as a percent)                   5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5.375PercentDue2021Member
   
Senior notes issued                   1,000,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5.375PercentDue2021Member
   
5.375% senior notes due 2021 | On or after November 1, 2016                        
Long- term Debt                        
Percentage of the principal amount of the debt instrument redeemed   104.031%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= ar_DebtInstrumentRedemptionPeriodOnOrAfter1November2016Member
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5.375PercentDue2021Member
                   
5.375% senior notes due 2021 | On or after November 1, 2019                        
Long- term Debt                        
Percentage of the principal amount of the debt instrument redeemed   100.00%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= ar_DebtInstrumentRedemptionPeriodOnOrAfter1November2019Member
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5.375PercentDue2021Member
                   
5.375% senior notes due 2021 | Prior to November 1, 2016                        
Long- term Debt                        
Percentage of the principal amount of the debt instrument redeemed   100.00%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= ar_DebtInstrumentRedemptionPeriodBefore1November2016Member
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5.375PercentDue2021Member
                   
5.375% senior notes due 2021 | On or before November 1, 2016                        
Long- term Debt                        
Redemption price of the debt instrument if redeemed with the proceeds of certain equity offerings (as a percent)   105.375%ar_LongTermDebtRedemptionPriceWithNetProceedsFromEquityOfferingsAsPercentageOfPrincipalAmount
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= ar_DebtInstrumentRedemptionPeriodOnOrBefore1November2016Member
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5.375PercentDue2021Member
                   
5.375% senior notes due 2021 | Prior to May 1, 2015                        
Long- term Debt                        
Redemption price of the debt instrument in the event of change of control (as a percent)   110.00%ar_LongTermDebtRedemptionPriceDueToChangeOfControlAsPercentageOfPrincipalAmount
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= ar_DebtInstrumentRedemptionPeriodBefore1May2015Member
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5.375PercentDue2021Member
                   
Percentage of principal amount at which notes may be required to be repurchased in event of change of control   101.00%ar_DebtInstrumentRedemptionPriceUponChangeOfControlAsPercentageOfPrincipalAmount
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= ar_DebtInstrumentRedemptionPeriodBefore1May2015Member
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5.375PercentDue2021Member
                   
5.375% senior notes due 2021 | Maximum | On or before November 1, 2016                        
Long- term Debt                        
Percentage of the principal amount of the debt instrument which the entity may redeem with the proceeds from certain equity offerings   35.00%ar_LongTermDebtRedemptionWithNetProceedsFromEquityOfferingsAsPercentageOfPrincipalAmount
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= ar_DebtInstrumentRedemptionPeriodOnOrBefore1November2016Member
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5.375PercentDue2021Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
                   
Net unamortized premium                        
Long- term Debt                        
Long-term debt   7,295,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= ar_UnamortizedDiscountPremiumMember
7,295,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= ar_UnamortizedDiscountPremiumMember
    7,550,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= ar_UnamortizedDiscountPremiumMember
           
Stand-alone revolving note                        
Long- term Debt                        
Maximum amount of the Credit Facility   25,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
25,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
                 
Outstanding balance   0us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
0us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
    0us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
           
Description of variable rate basis         lender's prime rate              
Basis spread on variable rate (as a percent)   1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
                   
5.125 senior notes due 2022                        
Long- term Debt                        
Long-term debt   1,100,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5125PercentDue2022Member
1,100,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5125PercentDue2022Member
    1,100,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5125PercentDue2022Member
           
Interest rate (as a percent)                     5.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5125PercentDue2022Member
 
Senior notes issued                     600,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5125PercentDue2022Member
 
5.125 senior notes due 2022 | On or after June 1, 2017                        
Long- term Debt                        
Percentage of the principal amount of the debt instrument redeemed   103.844%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= ar_DebtInstrumentRedemptionPeriodOnOrAfterJune12017Member
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5125PercentDue2022Member
                   
5.125 senior notes due 2022 | On or before June 1, 2017                        
Long- term Debt                        
Percentage of the principal amount of the debt instrument which the entity may redeem with the proceeds from certain equity offerings   35.00%ar_LongTermDebtRedemptionWithNetProceedsFromEquityOfferingsAsPercentageOfPrincipalAmount
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= ar_DebtInstrumentRedemptionPeriodOnOrBeforeJune12017Member
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5125PercentDue2022Member
                   
Redemption price of the debt instrument if redeemed with the proceeds of certain equity offerings (as a percent)   105.125%ar_LongTermDebtRedemptionPriceWithNetProceedsFromEquityOfferingsAsPercentageOfPrincipalAmount
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= ar_DebtInstrumentRedemptionPeriodOnOrBeforeJune12017Member
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5125PercentDue2022Member
                   
5.125 senior notes due 2022 | Prior to June 1, 2017                        
Long- term Debt                        
Percentage of the principal amount of the debt instrument redeemed   100.00%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= ar_DebtInstrumentRedemptionPeriodPriorToJune12017Member
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5125PercentDue2022Member
                   
5.125 senior notes due 2022 | On or after June 1, 2020                        
Long- term Debt                        
Percentage of the principal amount of the debt instrument redeemed   100.00%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= ar_DebtInstrumentRedemptionPeriodOnOrAfterJune12020Member
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5125PercentDue2022Member
                   
5.125 senior notes due 2022 | Prior to December 1, 2015                        
Long- term Debt                        
Redemption price of the debt instrument in the event of change of control (as a percent)   110.00%ar_LongTermDebtRedemptionPriceDueToChangeOfControlAsPercentageOfPrincipalAmount
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= ar_DebtInstrumentRedemptionPeriodBefore1December2015Member
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5125PercentDue2022Member
                   
Percentage of principal amount at which notes may be required to be repurchased in event of change of control   101.00%ar_DebtInstrumentRedemptionPriceUponChangeOfControlAsPercentageOfPrincipalAmount
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= ar_DebtInstrumentRedemptionPeriodBefore1December2015Member
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5125PercentDue2022Member
                   
5.625% senior notes due 2023                        
Long- term Debt                        
Long-term debt   750,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5625PercentDue2023Member
750,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5625PercentDue2023Member
                 
Interest rate (as a percent)                       5.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5625PercentDue2023Member
Senior notes issued                       $ 750,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5625PercentDue2023Member
5.625% senior notes due 2023 | On or after June 1, 2018                        
Long- term Debt                        
Redemption price of the debt instrument in the event of change of control (as a percent)   104.219%ar_LongTermDebtRedemptionPriceDueToChangeOfControlAsPercentageOfPrincipalAmount
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= ar_DebtInstrumentRedemptionPeriodOnOrAfterJune12018Member
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5625PercentDue2023Member
                   
5.625% senior notes due 2023 | On or before June 1, 2018                        
Long- term Debt                        
Redemption price of the debt instrument if redeemed with the proceeds of certain equity offerings (as a percent)   105.625%ar_LongTermDebtRedemptionPriceWithNetProceedsFromEquityOfferingsAsPercentageOfPrincipalAmount
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= ar_DebtInstrumentRedemptionPeriodOnOrBeforeJune12018Member
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5625PercentDue2023Member
                   
5.625% senior notes due 2023 | Prior to June 1, 2016                        
Long- term Debt                        
Redemption price of the debt instrument in the event of change of control (as a percent)   110.00%ar_LongTermDebtRedemptionPriceDueToChangeOfControlAsPercentageOfPrincipalAmount
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= ar_DebtInstrumentRedemptionPeriodPriorToJune12016Member
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5625PercentDue2023Member
                   
Percentage of principal amount at which notes may be required to be repurchased in event of change of control   101.00%ar_DebtInstrumentRedemptionPriceUponChangeOfControlAsPercentageOfPrincipalAmount
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= ar_DebtInstrumentRedemptionPeriodPriorToJune12016Member
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5625PercentDue2023Member
                   
5.625% senior notes due 2023 | Prior to June 1, 2018                        
Long- term Debt                        
Redemption price of the debt instrument in the event of change of control (as a percent)   100.00%ar_LongTermDebtRedemptionPriceDueToChangeOfControlAsPercentageOfPrincipalAmount
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= ar_DebtInstrumentRedemptionPeriodPriorToJune12018Member
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5625PercentDue2023Member
                   
5.625% senior notes due 2023 | On or after June 1, 2021                        
Long- term Debt                        
Redemption price of the debt instrument in the event of change of control (as a percent)   100.00%ar_LongTermDebtRedemptionPriceDueToChangeOfControlAsPercentageOfPrincipalAmount
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= ar_DebtinstrumentRedemptionPeriodOnOrAfterJune12021Member
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5625PercentDue2023Member
                   
5.625% senior notes due 2023 | Maximum | On or before June 1, 2018                        
Long- term Debt                        
Percentage of the principal amount of the debt instrument which the entity may redeem with the proceeds from certain equity offerings   35.00%ar_LongTermDebtRedemptionWithNetProceedsFromEquityOfferingsAsPercentageOfPrincipalAmount
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= ar_DebtInstrumentRedemptionPeriodOnOrBeforeJune12018Member
/ us-gaap_LongtermDebtTypeAxis
= ar_SeniorNotes5625PercentDue2023Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember