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Segment Information, Geographical Data and Major Customers (Parenthetical) (Detail) (USD $)	12 Months Ended						3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
General and administrative expenses	$ 189,819,000us-gaap_GeneralAndAdministrativeExpense		$ 187,976,000us-gaap_GeneralAndAdministrativeExpense		$ 175,609,000us-gaap_GeneralAndAdministrativeExpense
Additions to properties and equipment	364,194,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment		594,695,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment		440,572,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Corporate Vessels
Segment Reporting Information [Line Items]
Construction costs	235,200,000us-gaap_ConstructionAndDevelopmentCosts / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_CorporateVesselsMember		228,900,000us-gaap_ConstructionAndDevelopmentCosts / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_CorporateVesselsMember		229,300,000us-gaap_ConstructionAndDevelopmentCosts / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_CorporateVesselsMember
Sub-Saharan Africa/Europe | Troms Offshore Supply AS
Segment Reporting Information [Line Items]
Additions to properties and equipment			245,600,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = tdw_TromsOffshoreSupplyAsMember / us-gaap_StatementBusinessSegmentsAxis = tdw_SubSaharanAfricaAndEuropeMember
Chief Executive Officer
Segment Reporting Information [Line Items]
Settlement charge					5,200,000us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember		(5,200,000)us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember
Corporate
Segment Reporting Information [Line Items]
General and administrative expenses	40,621,000us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember	[1]	47,703,000us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember	[1]	48,704,000us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember	[1]
Corporate | Troms Offshore Supply AS
Segment Reporting Information [Line Items]
General and administrative expenses			$ 3,700,000us-gaap_GeneralAndAdministrativeExpense / us-gaap_BusinessAcquisitionAxis = tdw_TromsOffshoreSupplyAsMember / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
[1] Included in Corporate general and administrative expenses for the year ended March 31, 2014 and 2013 are transaction costs of $3.7 million related to the acquisition of Troms Offshore and a settlement charge of $5.2 million related to the payment of retirement benefits to a former Chief Executive Officer, respectively.

X

- Definition

The aggregate costs related to construction and development services during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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- Definition

Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 15

-Paragraph 6

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927



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-Name Accounting Standards Codification

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-Section 50

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- Definition

The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.4)

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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