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Schedule of Segment Reporting Information, Revenue by Vessel Class (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 1,468,358us-gaap_SalesRevenueServicesNet	$ 1,418,461us-gaap_SalesRevenueServicesNet	$ 1,229,998us-gaap_SalesRevenueServicesNet
Americas Fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	353,232us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_AmericasFleetDeepwaterVesselsMember	263,750us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_AmericasFleetDeepwaterVesselsMember	179,032us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_AmericasFleetDeepwaterVesselsMember
Percentage of revenue	24.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_AmericasFleetDeepwaterVesselsMember	18.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_AmericasFleetDeepwaterVesselsMember	15.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_AmericasFleetDeepwaterVesselsMember
Americas Fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	125,029us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_AmericasFleetTowingSupplyOrSupplyMember	115,055us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_AmericasFleetTowingSupplyOrSupplyMember	120,817us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_AmericasFleetTowingSupplyOrSupplyMember
Percentage of revenue	9.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_AmericasFleetTowingSupplyOrSupplyMember	8.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_AmericasFleetTowingSupplyOrSupplyMember	10.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_AmericasFleetTowingSupplyOrSupplyMember
Americas Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	27,438us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_AmericasFleetOtherMember	31,926us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_AmericasFleetOtherMember	27,210us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_AmericasFleetOtherMember
Percentage of revenue	2.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_AmericasFleetOtherMember	3.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_AmericasFleetOtherMember	2.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_AmericasFleetOtherMember
Americas Fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	505,699us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_AmericasFleetMember	410,731us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_AmericasFleetMember	327,059us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_AmericasFleetMember
Percentage of revenue	35.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_AmericasFleetMember	29.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_AmericasFleetMember	27.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_AmericasFleetMember
Asia and Pacific Fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	94,538us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_AsiaAndPacificFleetDeepwaterVesselsMember	88,191us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_AsiaAndPacificFleetDeepwaterVesselsMember	96,118us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_AsiaAndPacificFleetDeepwaterVesselsMember
Percentage of revenue	6.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_AsiaAndPacificFleetDeepwaterVesselsMember	6.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_AsiaAndPacificFleetDeepwaterVesselsMember	8.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_AsiaAndPacificFleetDeepwaterVesselsMember
Asia/Pacific Fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	53,281us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_AsiaAndPacificFleetTowingSupplyAndSupplyMember	62,630us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_AsiaAndPacificFleetTowingSupplyAndSupplyMember	84,217us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_AsiaAndPacificFleetTowingSupplyAndSupplyMember
Percentage of revenue	4.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_AsiaAndPacificFleetTowingSupplyAndSupplyMember	5.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_AsiaAndPacificFleetTowingSupplyAndSupplyMember	7.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_AsiaAndPacificFleetTowingSupplyAndSupplyMember
Asia and Pacific Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	3,001us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_AsiaAndPacificFleetOtherMember	3,797us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_AsiaAndPacificFleetOtherMember	3,679us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_AsiaAndPacificFleetOtherMember
Asia and Pacific Fleet Other | Maximum
Segment and Geographic Distribution of Operations [Line Items]
Percentage of revenue		1.00%tdw_SalesRevenueServicesPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember / tdw_RevenuesByVesselClassAxis = tdw_AsiaAndPacificFleetOtherMember	1.00%tdw_SalesRevenueServicesPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember / tdw_RevenuesByVesselClassAxis = tdw_AsiaAndPacificFleetOtherMember
Asia/Pacific Fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	150,820us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_AsiaAndPacificFleetMember	154,618us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_AsiaAndPacificFleetMember	184,014us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_AsiaAndPacificFleetMember
Percentage of revenue	10.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_AsiaAndPacificFleetMember	11.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_AsiaAndPacificFleetMember	15.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_AsiaAndPacificFleetMember
Middle East/North Africa Fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	85,279us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_MiddleEastAndNorthAfricaFleetDeepwaterVesselsMember	66,503us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_MiddleEastAndNorthAfricaFleetDeepwaterVesselsMember	55,945us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_MiddleEastAndNorthAfricaFleetDeepwaterVesselsMember
Percentage of revenue	6.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_MiddleEastAndNorthAfricaFleetDeepwaterVesselsMember	5.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_MiddleEastAndNorthAfricaFleetDeepwaterVesselsMember	5.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_MiddleEastAndNorthAfricaFleetDeepwaterVesselsMember
Middle East/North Africa Fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	117,232us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_MiddleEastAndNorthAfricaFleetTowingSupplyAndSupplyMember	116,720us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_MiddleEastAndNorthAfricaFleetTowingSupplyAndSupplyMember	89,902us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_MiddleEastAndNorthAfricaFleetTowingSupplyAndSupplyMember
Percentage of revenue	8.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_MiddleEastAndNorthAfricaFleetTowingSupplyAndSupplyMember	8.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_MiddleEastAndNorthAfricaFleetTowingSupplyAndSupplyMember	7.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_MiddleEastAndNorthAfricaFleetTowingSupplyAndSupplyMember
Middle East and North Africa Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	3,276us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_MiddleEastAndNorthAfricaFleetOtherMember	3,301us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_MiddleEastAndNorthAfricaFleetOtherMember	3,565us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_MiddleEastAndNorthAfricaFleetOtherMember
Middle East and North Africa Fleet Other | Maximum
Segment and Geographic Distribution of Operations [Line Items]
Percentage of revenue		1.00%tdw_SalesRevenueServicesPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember / tdw_RevenuesByVesselClassAxis = tdw_MiddleEastAndNorthAfricaFleetOtherMember	1.00%tdw_SalesRevenueServicesPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember / tdw_RevenuesByVesselClassAxis = tdw_MiddleEastAndNorthAfricaFleetOtherMember
Middle East/North Africa fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	205,787us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_MiddleEastAndNorthAfricaFleetMember	186,524us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_MiddleEastAndNorthAfricaFleetMember	149,412us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_MiddleEastAndNorthAfricaFleetMember
Percentage of revenue	14.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_MiddleEastAndNorthAfricaFleetMember	13.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_MiddleEastAndNorthAfricaFleetMember	12.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_MiddleEastAndNorthAfricaFleetMember
Sub-Saharan Africa/Europe Fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	326,315us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_SubSaharanAfricaAndEuropeFleetDeepwaterVesselsMember	364,722us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_SubSaharanAfricaAndEuropeFleetDeepwaterVesselsMember	273,544us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_SubSaharanAfricaAndEuropeFleetDeepwaterVesselsMember
Percentage of revenue	22.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_SubSaharanAfricaAndEuropeFleetDeepwaterVesselsMember	26.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_SubSaharanAfricaAndEuropeFleetDeepwaterVesselsMember	22.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_SubSaharanAfricaAndEuropeFleetDeepwaterVesselsMember
Sub-Saharan Africa/Europe Fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	208,324us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_SubSaharanAfricaAndEuropeFleetTowingSupplyAndSupplyMember	231,224us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_SubSaharanAfricaAndEuropeFleetTowingSupplyAndSupplyMember	226,357us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_SubSaharanAfricaAndEuropeFleetTowingSupplyAndSupplyMember
Percentage of revenue	14.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_SubSaharanAfricaAndEuropeFleetTowingSupplyAndSupplyMember	16.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_SubSaharanAfricaAndEuropeFleetTowingSupplyAndSupplyMember	18.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_SubSaharanAfricaAndEuropeFleetTowingSupplyAndSupplyMember
Sub Saharan Africa And Europe Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	71,413us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_SubSaharanAfricaAndEuropeFleetOtherMember	70,642us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_SubSaharanAfricaAndEuropeFleetOtherMember	69,612us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_SubSaharanAfricaAndEuropeFleetOtherMember
Percentage of revenue	5.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_SubSaharanAfricaAndEuropeFleetOtherMember	5.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_SubSaharanAfricaAndEuropeFleetOtherMember	6.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_SubSaharanAfricaAndEuropeFleetOtherMember
Sub-Saharan Africa/Europe Fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	606,052us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_SubSaharanAfricaAndEuropeFleetMember	666,588us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_SubSaharanAfricaAndEuropeFleetMember	569,513us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_SubSaharanAfricaAndEuropeFleetMember
Percentage of revenue	41.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_SubSaharanAfricaAndEuropeFleetMember	47.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_SubSaharanAfricaAndEuropeFleetMember	46.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_SubSaharanAfricaAndEuropeFleetMember
Worldwide Fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	859,364us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_WorldwideFleetDeepwaterVesselsMember	783,166us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_WorldwideFleetDeepwaterVesselsMember	604,639us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_WorldwideFleetDeepwaterVesselsMember
Percentage of revenue	58.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_WorldwideFleetDeepwaterVesselsMember	55.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_WorldwideFleetDeepwaterVesselsMember	50.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_WorldwideFleetDeepwaterVesselsMember
Worldwide Fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	503,866us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_WorldwideFleetTowingSupplyAndSupplyMember	525,629us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_WorldwideFleetTowingSupplyAndSupplyMember	521,293us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_WorldwideFleetTowingSupplyAndSupplyMember
Percentage of revenue	35.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_WorldwideFleetTowingSupplyAndSupplyMember	37.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_WorldwideFleetTowingSupplyAndSupplyMember	42.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_WorldwideFleetTowingSupplyAndSupplyMember
Worldwide Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	105,128us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_WorldwideFleetOtherMember	109,666us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_WorldwideFleetOtherMember	104,066us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_WorldwideFleetOtherMember
Percentage of revenue	7.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_WorldwideFleetOtherMember	8.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_WorldwideFleetOtherMember	8.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_WorldwideFleetOtherMember
Worldwide Fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 1,468,358us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_WorldwideFleetMember	$ 1,418,461us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_WorldwideFleetMember	$ 1,229,998us-gaap_SalesRevenueServicesNet / tdw_RevenuesByVesselClassAxis = tdw_WorldwideFleetMember
Percentage of revenue	100.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_WorldwideFleetMember	100.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_WorldwideFleetMember	100.00%tdw_SalesRevenueServicesPercentage / tdw_RevenuesByVesselClassAxis = tdw_WorldwideFleetMember

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

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