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Schedule of Goodwill by Reportable Segment (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Goodwill [Line Items]    
Accumulated impairment charges $ 370.9us-gaap_GoodwillImpairedAccumulatedImpairmentLoss  
Middle East/North Africa    
Goodwill [Line Items]    
Accumulated impairment charges   30.9us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= tdw_MiddleEastAndNorthAfricaMember
Asia/Pacific    
Goodwill [Line Items]    
Accumulated impairment charges   $ 56.3us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= tdw_AsiaPacificSegmentMember