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Commitments (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2006
Commitments and Contingencies Disclosure [Line Items]        
Operating lease rental payments due in 2015 $ 108,717,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent      
Operating lease rental payments due in 2016 71,573,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears      
Operating lease rental payments due in 2017 51,744,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears      
Operating lease rental payments due in 2018 45,669,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears      
Operating lease rental payments due in 2019 37,062,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears      
Rental expenses for non-cancellable lease, including contingent payments 144,981,000us-gaap_LeaseAndRentalExpense 192,482,000us-gaap_LeaseAndRentalExpense 178,292,000us-gaap_LeaseAndRentalExpense  
Commitments for capital expenditures 1,423,139,000us-gaap_OtherCommitment      
Malaysia [Member]        
Commitments and Contingencies Disclosure [Line Items]        
Commitments for capital expenditures 416,892,000us-gaap_OtherCommitment
/ us-gaap_StatementGeographicalAxis
= country_MY
     
Gulf of Mexico [Member]        
Commitments and Contingencies Disclosure [Line Items]        
Commitments for capital expenditures 279,395,000us-gaap_OtherCommitment
/ us-gaap_StatementGeographicalAxis
= mur_GulfOfMexicoMember
     
Eagle Ford Shale [Member]        
Commitments and Contingencies Disclosure [Line Items]        
Commitments for capital expenditures 378,989,000us-gaap_OtherCommitment
/ us-gaap_StatementGeographicalAxis
= mur_EagleFordShaleMember
     
Namibia [Member]        
Commitments and Contingencies Disclosure [Line Items]        
Commitments for capital expenditures 86,894,000us-gaap_OtherCommitment
/ us-gaap_StatementGeographicalAxis
= country_NA
     
Vietnam [Member]        
Commitments and Contingencies Disclosure [Line Items]        
Commitments for capital expenditures 52,400,000us-gaap_OtherCommitment
/ us-gaap_StatementGeographicalAxis
= country_VN
     
Equatorial Guinea [Member]        
Commitments and Contingencies Disclosure [Line Items]        
Commitments for capital expenditures 79,036,000us-gaap_OtherCommitment
/ us-gaap_StatementGeographicalAxis
= country_GQ
     
Australia [Member]        
Commitments and Contingencies Disclosure [Line Items]        
Commitments for capital expenditures 43,764,000us-gaap_OtherCommitment
/ us-gaap_StatementGeographicalAxis
= country_AU
     
Drilling Rigs And Associated Equipment [Member]        
Commitments and Contingencies Disclosure [Line Items]        
Commitments for capital expenditures 559,272,000us-gaap_OtherCommitment
/ us-gaap_GuaranteeObligationsByNatureAxis
= mur_DrillingRigsAndAssociatedEquipmentMember
     
Processing Production Handling and Transportation Services [Member]        
Commitments and Contingencies Disclosure [Line Items]        
Operating lease rental payments due in 2015 64,928,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
/ us-gaap_GuaranteeObligationsByNatureAxis
= mur_ProcessingProductionHandlingAndTransportationServicesMember
     
Operating lease rental payments due in 2016 49,792,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
/ us-gaap_GuaranteeObligationsByNatureAxis
= mur_ProcessingProductionHandlingAndTransportationServicesMember
     
Operating lease rental payments due in 2017 40,512,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
/ us-gaap_GuaranteeObligationsByNatureAxis
= mur_ProcessingProductionHandlingAndTransportationServicesMember
     
Operating lease rental payments due in 2018 33,019,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
/ us-gaap_GuaranteeObligationsByNatureAxis
= mur_ProcessingProductionHandlingAndTransportationServicesMember
     
Operating lease rental payments due in 2019 16,763,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
/ us-gaap_GuaranteeObligationsByNatureAxis
= mur_ProcessingProductionHandlingAndTransportationServicesMember
     
Processing and transportation charges 34,597,000us-gaap_UnrecordedUnconditionalPurchaseObligationPurchases
/ us-gaap_GuaranteeObligationsByNatureAxis
= mur_ProcessingProductionHandlingAndTransportationServicesMember
40,254,000us-gaap_UnrecordedUnconditionalPurchaseObligationPurchases
/ us-gaap_GuaranteeObligationsByNatureAxis
= mur_ProcessingProductionHandlingAndTransportationServicesMember
19,733,000us-gaap_UnrecordedUnconditionalPurchaseObligationPurchases
/ us-gaap_GuaranteeObligationsByNatureAxis
= mur_ProcessingProductionHandlingAndTransportationServicesMember
 
El Dorado Promise Annual Commitment from 2007 to 2016 [Member]        
Commitments and Contingencies Disclosure [Line Items]        
Future commitments 5,000,000mur_CommitmentsCumulativeAmount
/ us-gaap_GuaranteeObligationsByNatureAxis
= mur_ElDoradoPromiseAnnualCommitmentFromTwentyZeroSevenToTwentySixteenMember
     
Commitments for capital expenditures       38,700,000us-gaap_OtherCommitment
/ us-gaap_GuaranteeObligationsByNatureAxis
= mur_ElDoradoPromiseAnnualCommitmentFromTwentyZeroSevenToTwentySixteenMember
Accretion costs $ 541,000us-gaap_AccretionExpense
/ us-gaap_GuaranteeObligationsByNatureAxis
= mur_ElDoradoPromiseAnnualCommitmentFromTwentyZeroSevenToTwentySixteenMember
$ 805,000us-gaap_AccretionExpense
/ us-gaap_GuaranteeObligationsByNatureAxis
= mur_ElDoradoPromiseAnnualCommitmentFromTwentyZeroSevenToTwentySixteenMember
$ 1,063,000us-gaap_AccretionExpense
/ us-gaap_GuaranteeObligationsByNatureAxis
= mur_ElDoradoPromiseAnnualCommitmentFromTwentyZeroSevenToTwentySixteenMember