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Allocation of Purchase Price for Acquisition (Parenthetical) (Detail) (Vessels, Troms Offshore Supply AS, USD $) In Millions, unless otherwise specified	0 Months Ended
	Jun. 04, 2013
Vessels | Troms Offshore Supply AS
Business Combination Allocation of Purchase Price [Line Items]
Costs attributed to vessels under construction	$ 10.7us-gaap_ConstructionAndDevelopmentCosts / us-gaap_BusinessAcquisitionAxis = tdw_TromsOffshoreSupplyAsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_VesselsMember

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Namespace Prefix:	tdw_
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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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