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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
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 71us-gaap_AllocatedShareBasedCompensationExpense	$ 12us-gaap_AllocatedShareBasedCompensationExpense	$ 2,049us-gaap_AllocatedShareBasedCompensationExpense
Phantom Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value of phantom stock vested	1,647tdw_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodGrantDateFairValue / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember	1,806tdw_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodGrantDateFairValue / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember	2,390tdw_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodGrantDateFairValue / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember
Compensation expense	933us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember	1,706us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember	2,507us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember
Phantom stock compensation costs capitalized as part of an asset	$ 0tdw_CapitalizedAssetCosts / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember	$ 0tdw_CapitalizedAssetCosts / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember	$ 0tdw_CapitalizedAssetCosts / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember

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- Definition

Capitalized Asset Costs

+ References

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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.

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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

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