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Summary of Gain on Assets Disposition (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Fair Value Measurements [Line Items]
Amount of impairment incurred	$ 14,525us-gaap_AssetImpairmentCharges	$ 9,341us-gaap_AssetImpairmentCharges	$ 8,078us-gaap_AssetImpairmentCharges
Combined fair value of assets incurring impairment	$ 28,509tdw_AssetsFairValueDisclosure1	$ 11,149tdw_AssetsFairValueDisclosure1	$ 14,733tdw_AssetsFairValueDisclosure1

X

- Definition

Assets Fair Value Disclosure 1

+ References

No definition available.

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X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228

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