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Schedule of Phantom Stock Compensation Expense And Grant Date Fair Value (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | $ 71 us-gaap_AllocatedShareBasedCompensationExpense | $ 12 us-gaap_AllocatedShareBasedCompensationExpense | $ 2,049 us-gaap_AllocatedShareBasedCompensationExpense
Phantom Stock Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Grant date fair value of phantom stock vested | 1,647 tdw_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodGrantDateFairValue / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember | 1,806 tdw_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodGrantDateFairValue / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember | 2,390 tdw_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodGrantDateFairValue / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember
Compensation expense | 933 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember | 1,706 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember | 2,507 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember
Phantom stock compensation costs capitalized as part of an asset | $ 0 tdw_CapitalizedAssetCosts / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember | $ 0 tdw_CapitalizedAssetCosts / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember | $ 0 tdw_CapitalizedAssetCosts / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember

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- Definition Capitalized Asset Costs + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Options Vested in Period Grant Date Fair Value + References No definition available. + Details
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Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Period Type: |