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v3.25.1

Note 6 - Debt - Interest on Borrowings (Details) | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Global ABL Facility [Member] |  |
Weighted average interest rate | 5.92% | 5.95%
Senior Secured Term Loan B and Global ABL Facility [Member] |  |
Weighted average interest rate | 8.12% | 7.79%
Secured Debt [Member] | Senior Secured Term Loan B [Member] |  |
Weighted average interest rate | 8.29% | 8.02%

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- Definition Weighted average interest rate of long-term debt outstanding calculated at point in time. + References No definition available. + Details
Name: | us-gaap_LongtermDebtWeightedAverageInterestRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_CreditFacilityAxis=mrc_GlobalAblFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=mrc_SeniorSecuredTermLoanBAndGlobalABLFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mrc_SeniorSecuredTermLoanBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |