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Segment Reporting - Information about Segment Assets by Country (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]    
Total assets $ 3,460,031us-gaap_Assets $ 3,416,879us-gaap_Assets
AEA [Member]    
Segment Reporting Information [Line Items]    
Assets, continuing operations 922,868mdr_AssetsContinuingOperations
/ us-gaap_StatementGeographicalAxis
= mdr_AmericasEuropeAndAfricaMember		 976,179mdr_AssetsContinuingOperations
/ us-gaap_StatementGeographicalAxis
= mdr_AmericasEuropeAndAfricaMember
MEA [Member]    
Segment Reporting Information [Line Items]    
Assets, continuing operations 932,028mdr_AssetsContinuingOperations
/ us-gaap_StatementGeographicalAxis
= us-gaap_MiddleEastMember		 990,671mdr_AssetsContinuingOperations
/ us-gaap_StatementGeographicalAxis
= us-gaap_MiddleEastMember
ASA [Member]    
Segment Reporting Information [Line Items]    
Assets, continuing operations 758,473mdr_AssetsContinuingOperations
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember		 601,394mdr_AssetsContinuingOperations
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
Corporate and Other [Member]    
Segment Reporting Information [Line Items]    
Assets, continuing operations $ 846,662mdr_AssetsContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 $ 848,635mdr_AssetsContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember