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Schedule of Goodwill and Changes to Goodwill by Reportable Segment (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Goodwill [Line Items] |  |
Accumulated impairment charges | $ 370.9 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |
Middle East/North Africa |  |
Goodwill [Line Items] |  |
Accumulated impairment charges |  | 30.9 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = tdw_MiddleEastAndNorthAfricaMember
Asia/Pacific |  |
Goodwill [Line Items] |  |
Accumulated impairment charges |  | $ 56.3 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = tdw_AsiaPacificSegmentMember

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- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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