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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
Property, Plant and Equipment [Line Items]
Number Of Vessels	263tdw_NumberOfVessel		272tdw_NumberOfVessel
Carrying Value	$ 3,746,307us-gaap_PropertyPlantAndEquipmentNet		$ 3,621,608us-gaap_PropertyPlantAndEquipmentNet
Owned Vessels in Active Service
Property, Plant and Equipment [Line Items]
Number Of Vessels	242tdw_NumberOfVessel / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_VesselsInActiveServiceMember		257tdw_NumberOfVessel / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_VesselsInActiveServiceMember
Carrying Value	3,310,476us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_VesselsInActiveServiceMember		3,281,391us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_VesselsInActiveServiceMember
Stacked Vessels
Property, Plant and Equipment [Line Items]
Number Of Vessels	21tdw_NumberOfVessel / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_StackedVesselsMember		15tdw_NumberOfVessel / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_StackedVesselsMember
Carrying Value	38,489us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_StackedVesselsMember		9,743us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_StackedVesselsMember
Marine Equipment and Other Assets Under Construction
Property, Plant and Equipment [Line Items]
Carrying Value	315,552us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_MarineEquipmentAndOtherAssetsUnderConstructionMember		268,189us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_MarineEquipmentAndOtherAssetsUnderConstructionMember
Other Property Plant and Equipment
Property, Plant and Equipment [Line Items]
Carrying Value	$ 81,790us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember	[1]	$ 62,285us-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

Number of Vessels

+ References

No definition available.

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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

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