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Number of Shares of Tidewater Common Stock Held by Plan (Detail) (Defined Contribution Pension Plan 401k) | Mar. 31, 2015 | Mar. 31, 2014
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Defined Contribution Pension Plan 401k |  |
Defined Contribution Plan [Line Items] |  |
Number of shares of Tidewater common stock held by 401(k) plan | 299,256 us-gaap_CommonStockSharesHeldInEmployeeTrustShares / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_DefinedContributionPensionPlanFourZeroOneKMember | 273,662 us-gaap_CommonStockSharesHeldInEmployeeTrustShares / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_DefinedContributionPensionPlanFourZeroOneKMember

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- Details
Name: | tdw_DefinedContributionPlanLineItems
Namespace Prefix: | tdw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6418455&loc=d3e16701-113920 + Details
Name: | us-gaap_CommonStockSharesHeldInEmployeeTrustShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant