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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Minimum [Member] |  |
Maturity of Canadian government securities | 90 days | 90 days

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- Definition Maturity Period Used to Classify Investments + References No definition available. + Details
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Namespace Prefix: | mur_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |