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Commitments and Contingencies (Brazilian Customs) - Additional Information (Detail)
In Millions, unless otherwise specified
 1 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2011
BRL
Vessel
Dec. 31, 2014
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2014
BRL
Dec. 31, 2014
Revised
USD ($)
Dec. 31, 2014
Revised
BRL
Commitments and Contingencies Disclosure [Line Items]            
Fines assessed 155.0tdw_AssessedFine   $ 58.3tdw_AssessedFine   $ 47.8tdw_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   56.1tdw_AmountOfFinesDisallowedByAdministrativeAppealsBoard   149.0tdw_AmountOfFinesDisallowedByAdministrativeAppealsBoard    
Remaining amount of fines contested   10.5tdw_RemainingFineAmount   28.0tdw_RemainingFineAmount    
Decision disallowing the fines totaling       127.0tdw_DisallowedAmountOfTotalFinesByAdministrativeAppealsBoard