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

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- Definition Assets Fair Value Disclosure 1 + References No definition available. + Details
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Namespace Prefix: | tdw_
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Period Type: | duration

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- Details
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Namespace Prefix: | tdw_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- 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 + Details
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Namespace Prefix: | us-gaap_
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