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Long-Term Debt (Interest on Borrowings) (Details)
Dec. 31, 2014
Dec. 31, 2013
Global ABL Facility [Member]    
Debt Instrument [Line Items]    
Weighted-average interest rate 1.84%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_CreditFacilityAxis
= mrc_GlobalAblFacilityMember		 2.12%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_CreditFacilityAxis
= mrc_GlobalAblFacilityMember
Senior secured term loan [Member]    
Debt Instrument [Line Items]    
Weighted-average interest rate 5.10%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= mrc_SeniorSecuredTermLoansMember		 5.09%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= mrc_SeniorSecuredTermLoansMember