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Note 12 - Commitments and Contingencies (Details Textual) - Litigation Case, Asbestos Claims [Member] | Mar. 31, 2025
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Number of Lawsuits Filed | 469
Loss Contingency, Pending Claims, Number | 1,034

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- Definition The number of lawsuits filed. + References No definition available. + Details
Name: | mrc_NumberOfLawsuitsFiled
Namespace Prefix: | mrc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of pending claims pertaining to a loss contingency. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-4 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-9 + Details
Name: | us-gaap_LossContingencyPendingClaimsNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | srt_LitigationCaseAxis=mrc_LitigationCaseAsbestosClaimsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |