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Schedule of Vessel Commitments (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 Vessel
Significant Purchase and Supply Commitment [Line Items] |  |
Number of Vessels, commitments | 21 tdw_SignificantCommitmentNumberOfVessel |
Vessel Commitments |  |
Significant Purchase and Supply Commitment [Line Items] |  |
Number of Vessels, commitments | 24 tdw_SignificantCommitmentNumberOfVessel / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = tdw_VesselCommitmentsMember |
Total cost, commitments | $ 690,665 tdw_SignificantCommitmentsTotalExpenditure / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = tdw_VesselCommitmentsMember |
Invested, commitments | 310,612 tdw_SignificantCommitmentProgressPaymentsInvestedThroughPeriod / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = tdw_VesselCommitmentsMember |
Remaining Balance, commitments | 380,053 tdw_CommitmentsRemainingExpenditures / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = tdw_VesselCommitmentsMember |
Deepwater PSVs |  |
Significant Purchase and Supply Commitment [Line Items] |  |
Number of vessels under construction | 17 tdw_SignificantCommitmentsNewConstruction / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = tdw_DeepwaterPlatformSupplyVesselsMember | [1]
Total cost, under construction | 576,847 tdw_SignificantCommitmentTotalCostOfVesselUnderConstruction / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = tdw_DeepwaterPlatformSupplyVesselsMember | [1]
Invested, under construction | 223,301 tdw_SignificantCommitmentsNewConstructionProgressPaymentsInvested / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = tdw_DeepwaterPlatformSupplyVesselsMember | [1]
Remaining Balance, under construction | 353,546 tdw_SignificantCommitmentRemainingBalanceOfVesselUnderConstruction / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = tdw_DeepwaterPlatformSupplyVesselsMember | [1]
Towing Supply Vessels |  |
Significant Purchase and Supply Commitment [Line Items] |  |
Number of vessels under construction | 6 tdw_SignificantCommitmentsNewConstruction / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = tdw_TowingSupplyAndSupplyMember | [1]
Total cost, under construction | 105,804 tdw_SignificantCommitmentTotalCostOfVesselUnderConstruction / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = tdw_TowingSupplyAndSupplyMember | [1]
Invested, under construction | 79,297 tdw_SignificantCommitmentsNewConstructionProgressPaymentsInvested / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = tdw_TowingSupplyAndSupplyMember | [1]
Remaining Balance, under construction | 26,507 tdw_SignificantCommitmentRemainingBalanceOfVesselUnderConstruction / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = tdw_TowingSupplyAndSupplyMember | [1]
Other |  |
Significant Purchase and Supply Commitment [Line Items] |  |
Number of vessels under construction | 1 tdw_SignificantCommitmentsNewConstruction / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = tdw_OthersMember |
Total cost, under construction | 8,014 tdw_SignificantCommitmentTotalCostOfVesselUnderConstruction / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = tdw_OthersMember |
Invested, under construction | $ 8,014 tdw_SignificantCommitmentsNewConstructionProgressPaymentsInvested / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = tdw_OthersMember |
[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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