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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	$ 1.9us-gaap_AdvancesToAffiliate / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = tdw_DtdwHoldingsLtdMember
Amount of vessel sold	23.3us-gaap_RelatedPartyTransactionAmountsOfTransaction / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = tdw_DtdwHoldingsLtdMember
Gain realized from vessel sold	7.9us-gaap_RevenueFromRelatedParties / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = tdw_DtdwHoldingsLtdMember
Deferred gain recognized from vessel sold	$ 5.2tdw_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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