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Commitments and Contingencies (Brazilian Customs) - Additional Information (Detail)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended
Apr. 30, 2011
BRL
Vessel
Mar. 31, 2015
USD ($)
Mar. 31, 2015
BRL
Mar. 31, 2015
Revised
USD ($)
Mar. 31, 2015
Revised
BRL
Commitments and Contingencies Disclosure [Line Items]          
Fines assessed 155.0tdw_AssessedFine $ 48.5tdw_AssessedFine   $ 39.7tdw_AssessedFine
/ tdw_OperationRevenuesByEntityAxis
= tdw_RevisedMember		 127.0tdw_AssessedFine
/ tdw_OperationRevenuesByEntityAxis
= tdw_RevisedMember
Number of Tidewater vessels that the subsidiaries failed to obtain import licenses from 17tdw_NumberOfVesselsThatSubsidiariesFailedToObtainImportLicensesFrom        
Disallowed amount of total fines by the administrative appeals board   46.6tdw_AmountOfFinesDisallowedByAdministrativeAppealsBoard 149.0tdw_AmountOfFinesDisallowedByAdministrativeAppealsBoard    
Remaining amount of fines contested   8.8tdw_RemainingFineAmount 28.0tdw_RemainingFineAmount    
Decision disallowing the fines totaling     127tdw_DisallowedAmountOfTotalFinesByAdministrativeAppealsBoard