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

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- Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_ConstructionAndDevelopmentCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration