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Segment Reporting - Significant Impact of Customers on Company Segments (Detail) (Sales Revenue, Net [Member])
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Middle East [Member] | Saudi Aramco [Member]      
Segment Reporting Information [Line Items]      
Percentage of consolidated revenues 27.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_MajorCustomersAxis
= mdr_SaudiAramcoMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_MiddleEastMember		 25.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_MajorCustomersAxis
= mdr_SaudiAramcoMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_MiddleEastMember		 22.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_MajorCustomersAxis
= mdr_SaudiAramcoMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_MiddleEastMember
Middle East [Member] | Azerbaijan International Oil Company [Member]      
Segment Reporting Information [Line Items]      
Percentage of consolidated revenues   13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_MajorCustomersAxis
= mdr_AzerbaijanInternationalOilCompanyMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_MiddleEastMember		  
Asia Pacific [Member] | Inpex Operations Australia Pty Ltd [Member]      
Segment Reporting Information [Line Items]      
Percentage of consolidated revenues 25.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_MajorCustomersAxis
= mdr_InpexOperationsAustraliaPtyLtdMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember		    
Asia Pacific [Member] | Exxon Mobil Corporation [Member]      
Segment Reporting Information [Line Items]      
Percentage of consolidated revenues     24.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_MajorCustomersAxis
= mdr_ExxonMobilCorporationMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember
Asia Pacific [Member] | BHP Billiton Petroleum Pty Ltd [Member]      
Segment Reporting Information [Line Items]      
Percentage of consolidated revenues     10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_MajorCustomersAxis
= mdr_BHPBillitonLtdMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember