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Summary of Net Properties and Equipment (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 Vessel | Mar. 31, 2014 Vessel
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Property, Plant and Equipment [Line Items] |  |  |  |
Number Of Vessels | 263 tdw_NumberOfVessel |  | 272 tdw_NumberOfVessel |
Carrying Value | $ 3,746,307 us-gaap_PropertyPlantAndEquipmentNet |  | $ 3,621,608 us-gaap_PropertyPlantAndEquipmentNet |
Owned Vessels in Active Service |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Number Of Vessels | 242 tdw_NumberOfVessel / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_VesselsInActiveServiceMember |  | 257 tdw_NumberOfVessel / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_VesselsInActiveServiceMember |
Carrying Value | 3,310,476 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_VesselsInActiveServiceMember |  | 3,281,391 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_VesselsInActiveServiceMember |
Stacked Vessels |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Number Of Vessels | 21 tdw_NumberOfVessel / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_StackedVesselsMember |  | 15 tdw_NumberOfVessel / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_StackedVesselsMember |
Carrying Value | 38,489 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_StackedVesselsMember |  | 9,743 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_StackedVesselsMember |
Marine Equipment and Other Assets Under Construction |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Carrying Value | 315,552 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_MarineEquipmentAndOtherAssetsUnderConstructionMember |  | 268,189 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_MarineEquipmentAndOtherAssetsUnderConstructionMember |
Other Property Plant and Equipment |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Carrying Value | $ 81,790 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember | [1] | $ 62,285 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember | [1]
[1] | Other property and equipment includes six remotely operated vehicles the company took delivery of in fiscal 2014 and two remotely operated vehicles the company took delivery of in fiscal 2015.

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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