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Schedule of Vessel Commitments (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 1 Months Ended 2 Months Ended
Mar. 31, 2015
Vessel
Apr. 30, 2015
Contract
May 27, 2015
May 31, 2015
Vessel
May 27, 2015
Vessel
Deepwater PSVs          
Significant Purchase and Supply Commitment [Line Items]          
Aggregate installment payment $ 1,000tdw_SignificantCommitmentsNewConstructionProgressPaymentsInvested
/ tdw_SignificantPurchaseAndSupplyCommitmentAxis
= tdw_DeepwaterPlatformSupplyVesselsMember		        
Towing Supply Vessels          
Significant Purchase and Supply Commitment [Line Items]          
Number of vessels under construction 6tdw_SignificantCommitmentsNewConstruction
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= tdw_TowingSupplyAndSupplyMember		 [1]        
Aggregate installment payment 79,297tdw_SignificantCommitmentsNewConstructionProgressPaymentsInvested
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= tdw_TowingSupplyAndSupplyMember		 [1]        
Aggregate estimated remaining cost 26,507tdw_SignificantCommitmentRemainingBalanceOfVesselUnderConstruction
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= tdw_TowingSupplyAndSupplyMember		 [1]        
Subsequent Event          
Significant Purchase and Supply Commitment [Line Items]          
Number of vessels constructions terminated   3tdw_NumberOfContractsTerminated
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Subsequent Event | Deepwater PSVs          
Significant Purchase and Supply Commitment [Line Items]          
Number of vessels under construction       2tdw_SignificantCommitmentsNewConstruction
/ tdw_SignificantPurchaseAndSupplyCommitmentAxis
= tdw_DeepwaterPlatformSupplyVesselsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		 2tdw_SignificantCommitmentsNewConstruction
/ tdw_SignificantPurchaseAndSupplyCommitmentAxis
= tdw_DeepwaterPlatformSupplyVesselsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Significant commitment, new construction delivery date     Jun. 30, 2016 Jun. 30, 2016  
Aggregate installment payment     5,400tdw_SignificantCommitmentsNewConstructionProgressPaymentsInvested
/ tdw_SignificantPurchaseAndSupplyCommitmentAxis
= tdw_DeepwaterPlatformSupplyVesselsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		 5,700tdw_SignificantCommitmentsNewConstructionProgressPaymentsInvested
/ tdw_SignificantPurchaseAndSupplyCommitmentAxis
= tdw_DeepwaterPlatformSupplyVesselsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		 5,400tdw_SignificantCommitmentsNewConstructionProgressPaymentsInvested
/ tdw_SignificantPurchaseAndSupplyCommitmentAxis
= tdw_DeepwaterPlatformSupplyVesselsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Aggregate estimated remaining cost       41,000tdw_SignificantCommitmentRemainingBalanceOfVesselUnderConstruction
/ tdw_SignificantPurchaseAndSupplyCommitmentAxis
= tdw_DeepwaterPlatformSupplyVesselsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Subsequent Event | Commitment upon Contract Termination [Member]          
Significant Purchase and Supply Commitment [Line Items]          
Remaining Balance, commitments   13,000tdw_CommitmentsRemainingExpenditures
/ us-gaap_OtherCommitmentsAxis
= tdw_CommitmentUponContractTerminationMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Subsequent Event | Towing Supply Vessels          
Significant Purchase and Supply Commitment [Line Items]          
Number of vessels constructions terminated   3tdw_NumberOfContractsTerminated
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= tdw_TowingSupplyAndSupplyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
[1] In April 2015, the company cancelled the construction contracts for three towing-supply vessels. There were approximately $13 million of remaining costs to be incurred on these three vessels at the time of termination. In May 2015, the company and the Chinese shipyard that is constructing two 275-foot deepwater PSVs came to an agreement that provides the company an option to take delivery of one or both vessels at any time prior to June 30, 2016 or receive the return of installments aggregating $5.7 million per vessel at the end of this period. There were approximately $41 million of remaining costs to be incurred on these two vessels at the time of the agreement. Refer to Note (19) for a discussion of these vessel construction contract modifications.