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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 | $ 189,819,000 us-gaap_GeneralAndAdministrativeExpense |  | $ 187,976,000 us-gaap_GeneralAndAdministrativeExpense |  | $ 175,609,000 us-gaap_GeneralAndAdministrativeExpense |  |
Additions to properties and equipment | 364,194,000 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |  | 594,695,000 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |  | 440,572,000 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |  |
Corporate Vessels |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Construction costs | 235,200,000 us-gaap_ConstructionAndDevelopmentCosts / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_CorporateVesselsMember |  | 228,900,000 us-gaap_ConstructionAndDevelopmentCosts / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_CorporateVesselsMember |  | 229,300,000 us-gaap_ConstructionAndDevelopmentCosts / tdw_SignificantPurchaseAndSupplyCommitmentAxis = tdw_CorporateVesselsMember |  |
Sub-Saharan Africa/Europe | Troms Offshore Supply AS |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Additions to properties and equipment |  |  | 245,600,000 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = tdw_TromsOffshoreSupplyAsMember / us-gaap_StatementBusinessSegmentsAxis = tdw_SubSaharanAfricaAndEuropeMember |  |  |  |
Chief Executive Officer |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Settlement charge |  |  |  |  | 5,200,000 us-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 | 40,621,000 us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | [1] | 47,703,000 us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | [1] | 48,704,000 us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | [1] |
Corporate | Troms Offshore Supply AS |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
General and administrative expenses |  |  | $ 3,700,000 us-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.

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- 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 + Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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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) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition 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 + Details
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