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v2.4.1.9

Investment in Unconsolidated Companies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Mar. 31, 2015
DTDW Holdings, Ltd. |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership percentage in unconsolidated affiliates | 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = tdw_DtdwHoldingsLtdMember | 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = tdw_DtdwHoldingsLtdMember
Advances to unconsolidated companies | $ 1.9 us-gaap_AdvancesToAffiliate / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = tdw_DtdwHoldingsLtdMember |
Amount of vessel sold | 23.3 us-gaap_RelatedPartyTransactionAmountsOfTransaction / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = tdw_DtdwHoldingsLtdMember |
Gain realized from vessel sold | 7.9 us-gaap_RevenueFromRelatedParties / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = tdw_DtdwHoldingsLtdMember |
Deferred gain recognized from vessel sold | $ 5.2 tdw_DeferredGainsFromRelatedPartyTransactions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = tdw_DtdwHoldingsLtdMember |
Maximum |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership percentage in unconsolidated affiliates |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember

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