XML 1150 R129.htm IDEA: XBRL DOCUMENT v2.4.1.9
Schedule of Vessel Commitments (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2015
Vessel
Significant Purchase and Supply Commitment [Line Items]  
Number of Vessels, commitments 21tdw_SignificantCommitmentNumberOfVessel
Vessel Commitments  
Significant Purchase and Supply Commitment [Line Items]  
Number of Vessels, commitments 24tdw_SignificantCommitmentNumberOfVessel
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= tdw_VesselCommitmentsMember
Total cost, commitments $ 690,665tdw_SignificantCommitmentsTotalExpenditure
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= tdw_VesselCommitmentsMember
Invested, commitments 310,612tdw_SignificantCommitmentProgressPaymentsInvestedThroughPeriod
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= tdw_VesselCommitmentsMember
Remaining Balance, commitments 380,053tdw_CommitmentsRemainingExpenditures
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= tdw_VesselCommitmentsMember
Deepwater PSVs  
Significant Purchase and Supply Commitment [Line Items]  
Number of vessels under construction 17tdw_SignificantCommitmentsNewConstruction
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= tdw_DeepwaterPlatformSupplyVesselsMember		 [1]
Total cost, under construction 576,847tdw_SignificantCommitmentTotalCostOfVesselUnderConstruction
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= tdw_DeepwaterPlatformSupplyVesselsMember		 [1]
Invested, under construction 223,301tdw_SignificantCommitmentsNewConstructionProgressPaymentsInvested
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= tdw_DeepwaterPlatformSupplyVesselsMember		 [1]
Remaining Balance, under construction 353,546tdw_SignificantCommitmentRemainingBalanceOfVesselUnderConstruction
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= tdw_DeepwaterPlatformSupplyVesselsMember		 [1]
Towing Supply Vessels  
Significant Purchase and Supply Commitment [Line Items]  
Number of vessels under construction 6tdw_SignificantCommitmentsNewConstruction
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= tdw_TowingSupplyAndSupplyMember		 [1]
Total cost, under construction 105,804tdw_SignificantCommitmentTotalCostOfVesselUnderConstruction
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= tdw_TowingSupplyAndSupplyMember		 [1]
Invested, under construction 79,297tdw_SignificantCommitmentsNewConstructionProgressPaymentsInvested
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= tdw_TowingSupplyAndSupplyMember		 [1]
Remaining Balance, under construction 26,507tdw_SignificantCommitmentRemainingBalanceOfVesselUnderConstruction
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= tdw_TowingSupplyAndSupplyMember		 [1]
Other  
Significant Purchase and Supply Commitment [Line Items]  
Number of vessels under construction 1tdw_SignificantCommitmentsNewConstruction
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= tdw_OthersMember
Total cost, under construction 8,014tdw_SignificantCommitmentTotalCostOfVesselUnderConstruction
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= tdw_OthersMember
Invested, under construction $ 8,014tdw_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.