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Long-Term Debt and Notes Payable - Additional Information 2 (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Debt issuance costs $ 25.5us-gaap_DebtIssuanceCosts $ 27.1us-gaap_DebtIssuanceCosts
Mexico [Member]    
Debt Instrument [Line Items]    
Bonds issued related to JRMSA general agreement of indemnity 46.3mdr_LettersOfCreditSuretyBondsAndOtherArrangements
/ us-gaap_StatementGeographicalAxis
= country_MX		 52.5mdr_LettersOfCreditSuretyBondsAndOtherArrangements
/ us-gaap_StatementGeographicalAxis
= country_MX
Reimbursement Agreement [Member]    
Debt Instrument [Line Items]    
Bank guarantees issued $ 73.7mdr_BankGuaranteesOutstanding
/ us-gaap_CreditFacilityAxis
= mdr_ReimbursementAgreementMember		 $ 56.2mdr_BankGuaranteesOutstanding
/ us-gaap_CreditFacilityAxis
= mdr_ReimbursementAgreementMember