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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 | $ 1,000 tdw_SignificantCommitmentsNewConstructionProgressPaymentsInvested / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_DeepwaterPlatformSupplyVesselsMember |  |  |  |  |
Towing Supply Vessels |  |  |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |  |  |
Number of vessels under construction | 6 tdw_SignificantCommitmentsNewConstruction / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = tdw_TowingSupplyAndSupplyMember | [1] |  |  |  |
Aggregate installment payment | 79,297 tdw_SignificantCommitmentsNewConstructionProgressPaymentsInvested / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = tdw_TowingSupplyAndSupplyMember | [1] |  |  |  |
Aggregate estimated remaining cost | 26,507 tdw_SignificantCommitmentRemainingBalanceOfVesselUnderConstruction / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = tdw_TowingSupplyAndSupplyMember | [1] |  |  |  |
Subsequent Event |  |  |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |  |  |
Number of vessels constructions terminated |  |  | 3 tdw_NumberOfContractsTerminated / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Subsequent Event | Deepwater PSVs |  |  |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |  |  |
Number of vessels under construction |  |  |  |  | 2 tdw_SignificantCommitmentsNewConstruction / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_DeepwaterPlatformSupplyVesselsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 2 tdw_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 |  |  |  | 5,400 tdw_SignificantCommitmentsNewConstructionProgressPaymentsInvested / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_DeepwaterPlatformSupplyVesselsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 5,700 tdw_SignificantCommitmentsNewConstructionProgressPaymentsInvested / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_DeepwaterPlatformSupplyVesselsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 5,400 tdw_SignificantCommitmentsNewConstructionProgressPaymentsInvested / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_DeepwaterPlatformSupplyVesselsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Aggregate estimated remaining cost |  |  |  |  | 41,000 tdw_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 |  |  | 13,000 tdw_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 |  |  | 3 tdw_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.

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