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Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ 172,119us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax [1] $ 408,901us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax [1]  
Before reclassifications to income (350,894)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax [1] (181,155)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax [1]  
Reclassifications to income 8,520us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax [1] (55,627)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax [1]  
Net other comprehensive income (loss) (342,374)us-gaap_OtherComprehensiveIncomeLossNetOfTax [1] (236,782)us-gaap_OtherComprehensiveIncomeLossNetOfTax [1] 98,481us-gaap_OtherComprehensiveIncomeLossNetOfTax
Ending Balance (170,255)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax [1] 172,119us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax [1] 408,901us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax [1]
Reclassifications before taxes, included in net periodic benefit expense 9,813us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax 18,570us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax  
Reclassifications income tax, included in net periodic benefit expense 3,206us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 8,132us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1  
Reclassifications before taxes, included in interest expense 2,963us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax 2,963us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax  
Reclassifications income tax, included in interest expense 1,050us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax 1,028us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax  
Foreign Currency Translation Gains (Losses) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 305,192us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		 [1] 613,492us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		 [1]  
Before reclassifications to income (271,491)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		 [1] (240,300)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		 [1]  
Reclassifications to income   (68,000)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		 [1],[2]  
Net other comprehensive income (loss) (271,491)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		 [1] (308,300)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		 [1]  
Ending Balance 33,701us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		 [1] 305,192us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		 [1]  
Retirement and Postretirement Benefit Plan Adjustments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (116,956)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [1] (186,539)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [1]  
Before reclassifications to income (79,403)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [1] 59,145us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [1]  
Reclassifications to income 6,607us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [1],[3] 10,438us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [1],[3]  
Net other comprehensive income (loss) (72,796)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [1] 69,583us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [1]  
Ending Balance (189,752)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [1] (116,956)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [1]  
Deferred Loss On Interest Rate Derivative Hedges [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (16,117)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= mur_DeferredLossOnInterestRateDerivativeHedgesMember		 [1] (18,052)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= mur_DeferredLossOnInterestRateDerivativeHedgesMember		 [1]  
Reclassifications to income 1,913us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= mur_DeferredLossOnInterestRateDerivativeHedgesMember		 [1],[4] 1,935us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= mur_DeferredLossOnInterestRateDerivativeHedgesMember		 [1],[4]  
Net other comprehensive income (loss) 1,913us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= mur_DeferredLossOnInterestRateDerivativeHedgesMember		 [1] 1,935us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= mur_DeferredLossOnInterestRateDerivativeHedgesMember		 [1]  
Ending Balance $ (14,204)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= mur_DeferredLossOnInterestRateDerivativeHedgesMember		 [1] $ (16,117)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= mur_DeferredLossOnInterestRateDerivativeHedgesMember		 [1]  
[1] All amounts are presented net of income taxes.
[2] Reclassification is included in income from discontinued operations, net of income taxes.
[3] Reclassifications before taxes of $18,570 and $9,813 are included in the computation of net periodic benefit expense in 2013 and 2014, respectively. Related income taxes of $8,132 and $3,206 are included in Income tax expense in 2013 and 2014, respectively.
[4] Reclassifications before taxes of $2,963 are included in Interest expense in both 2013 and 2014. Related income taxes of $1,028 and $1,050 are included in Income tax expense in 2013 and 2014, respectively.