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Sale/ Leaseback Arrangements - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended
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Mar. 31, 2015 Vessel | Mar. 31, 2014 Vessel | Jul. 31, 2009 Entity Vessel | Jun. 30, 2009 Entity Vessel | Mar. 31, 2006 Vessel Leases | Mar. 31, 2015 Vessel | Dec. 31, 2014 Vessel | Sep. 30, 2014 Vessel | Jun. 30, 2014 Vessel | Mar. 31, 2014 Vessel | Dec. 31, 2013 Vessel | Sep. 30, 2013 Vessel | Mar. 31, 2015 Vessel | Mar. 31, 2014 Vessel | Mar. 31, 2010 | Mar. 31, 2006 Leases | Nov. 30, 2014 | Sep. 30, 2012 | Oct. 31, 2012
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels sold | 2 tdw_SaleLeasebackTransactionNumberOfVessels | 3 tdw_SaleLeasebackTransactionNumberOfVessels | 6 tdw_SaleLeasebackTransactionNumberOfVessels | 6 tdw_SaleLeasebackTransactionNumberOfVessels |  | 1 tdw_SaleLeasebackTransactionNumberOfVessels | 3 tdw_SaleLeasebackTransactionNumberOfVessels | 1 tdw_SaleLeasebackTransactionNumberOfVessels | 1 tdw_SaleLeasebackTransactionNumberOfVessels | 4 tdw_SaleLeasebackTransactionNumberOfVessels | 4 tdw_SaleLeasebackTransactionNumberOfVessels | 2 tdw_SaleLeasebackTransactionNumberOfVessels | 6 tdw_SaleLeasebackTransactionNumberOfVessels | 10 tdw_SaleLeasebackTransactionNumberOfVessels |  |  |  |  |
Number of unrelated third-party companies |  |  | 1 tdw_SaleLeasebackTransactionNumberOfUnrelatedThirdPartyCompanies | 1 tdw_SaleLeasebackTransactionNumberOfUnrelatedThirdPartyCompanies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  | $ 76,500,000 us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities | $ 13,000,000 us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities | $ 78,200,000 us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities | $ 19,350,000 us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities | $ 13,400,000 us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities | $ 63,305,000 us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities | $ 141,900,000 us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities | $ 65,550,000 us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities | $ 123,950,000 us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities | $ 270,755,000 us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities | $ 101,800,000 us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities |  |  |  |
Deferred gain |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,600,000 us-gaap_SaleLeasebackTransactionDeferredGainGross |  |  |  |
Carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 62,200,000 us-gaap_SaleLeasebackTransactionNetBookValue |  |  |  |
Charter hire operating lease terms |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |
Repurchase of leased vessels |  |  |  |  |  |  |  |  |  |  |  |  |  | 78,800,000 tdw_PurchasesOfLeasedInAssets |  |  |  |  |
Number of vessels to be sold that are under construction |  |  |  |  | 5 tdw_SaleLeasebackTransactionNumberOfVesselsUnderConstruction |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Operating Lease |  |  |  |  | 5 tdw_NumberOfOperatingLeases |  |  |  |  |  |  |  |  |  |  | 5 tdw_NumberOfOperatingLeases |  |  |
Length of extension period, years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 years |  |  |
Third and Fourth PSV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of leased vessels |  | 22,800,000 tdw_PurchasesOfLeasedInAssets / us-gaap_SaleLeasebackTransactionDescriptionAxis = tdw_ThirdAndFourthVesselsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fifth Vessel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of leased vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,200,000 tdw_PurchasesOfLeasedInAssets / us-gaap_SaleLeasebackTransactionDescriptionAxis = tdw_FifthVesselMember |  |
First PSV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of leased vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,800,000 tdw_PurchasesOfLeasedInAssets / us-gaap_SaleLeasebackTransactionDescriptionAxis = tdw_VesselOneMember |
Second PSV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of leased vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,400,000 tdw_PurchasesOfLeasedInAssets / us-gaap_SaleLeasebackTransactionDescriptionAxis = tdw_VesselTwoMember

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- Definition The amount of the gain recorded in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller to be recognized in future periods. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6456126&loc=d3e49567-112750 + Details
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- Definition Amount of cash inflow before closing and deferred financing costs received by a seller-lessee in a sale-leaseback recognized in investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51840-112757 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51831-112757 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51843-112757 + Details
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- Definition The net book value of the asset(s) sold in connection with the sale of the property to another party and lease back to the seller. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51840-112757 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51831-112757 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51843-112757 + Details
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