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Commitments and Contingencies (Sonatide Joint Venture) - Additional Information (Detail) (USD $)	12 Months Ended			1 Months Ended	3 Months Ended
	Mar. 31, 2015 Vessel	Mar. 31, 2014 Vessel	Mar. 31, 2013	Nov. 30, 2013	Dec. 31, 2014
Commitments and Contingencies Disclosure [Line Items]
Vessel revenues	$ 1,468,358,000us-gaap_SalesRevenueServicesNet	$ 1,418,461,000us-gaap_SalesRevenueServicesNet	$ 1,229,998,000us-gaap_SalesRevenueServicesNet
Number of vessels operating	263tdw_NumberOfVessel	272tdw_NumberOfVessel
Investments in, at equity, and advances to unconsolidated companies	65,844,000us-gaap_EquityMethodInvestments	63,928,000us-gaap_EquityMethodInvestments	46,047,000us-gaap_EquityMethodInvestments
Commissions payable	8,282,000us-gaap_AccruedSalesCommissionCurrent	8,263,000us-gaap_AccruedSalesCommissionCurrent
Minimum
Commitments and Contingencies Disclosure [Line Items]
Additional percentage of surcharges on foreign exchange transactions	10.00%tdw_PercentageOfSurchargesChargedOnForeignExchangeTransactions / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum
Commitments and Contingencies Disclosure [Line Items]
Ownership Interest In Joint Venture	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember
Additional percentage of surcharges on foreign exchange transactions	20.00%tdw_PercentageOfSurchargesChargedOnForeignExchangeTransactions / us-gaap_RangeAxis = us-gaap_MaximumMember
Expected time period to deliver the new build vessels	2 years
Sonatide joint venture
Commitments and Contingencies Disclosure [Line Items]
Definitive joint venture agreement term				2 years
Proceeds from related party	338,000,000us-gaap_ProceedsFromContributionsFromAffiliates / dei_LegalEntityAxis = tdw_SonatideMember
Proceeds from dividends received					10,000,000us-gaap_ProceedsFromDividendsReceived / dei_LegalEntityAxis = tdw_SonatideMember
Due from related parties	420,000,000us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = tdw_SonatideMember
Number of vessels operating	10tdw_NumberOfVessel / dei_LegalEntityAxis = tdw_SonatideMember
Number of vessels stacked	3tdw_NumberOfVesselsStacked / dei_LegalEntityAxis = tdw_SonatideMember
Ownership Interest In Joint Venture	49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = tdw_SonatideMember
Investments in, at equity, and advances to unconsolidated companies	67,000,000us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = tdw_SonatideMember	62,000,000us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = tdw_SonatideMember
Sonatide joint venture | U.S. dollars initially received by Sonatide on behalf of the company or dollars collected from other customers
Commitments and Contingencies Disclosure [Line Items]
Proceeds from related party	159,000,000us-gaap_ProceedsFromContributionsFromAffiliates / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementScenarioAxis = tdw_ScenarioOneMember
Sonatide joint venture | Sonatide's converting kwanza into dollars and subsequently expatriating the dollars to Tidewater
Commitments and Contingencies Disclosure [Line Items]
Proceeds from related party	179,000,000us-gaap_ProceedsFromContributionsFromAffiliates / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementScenarioAxis = tdw_ScenarioTwoMember
Sonatide joint venture | Trade and other receivables
Commitments and Contingencies Disclosure [Line Items]
Due from related parties	420,000,000us-gaap_DueFromRelatedPartiesCurrent / us-gaap_BalanceSheetLocationAxis = tdw_TradeAndOtherReceivablesMember / dei_LegalEntityAxis = tdw_SonatideMember	430,000,000us-gaap_DueFromRelatedPartiesCurrent / us-gaap_BalanceSheetLocationAxis = tdw_TradeAndOtherReceivablesMember / dei_LegalEntityAxis = tdw_SonatideMember
Sonatide joint venture | Accrued expenses
Commitments and Contingencies Disclosure [Line Items]
Due to related parties	186,000,000us-gaap_DueToRelatedPartiesCurrent / us-gaap_BalanceSheetLocationAxis = tdw_AccruedExpensesMember / dei_LegalEntityAxis = tdw_SonatideMember	86,000,000us-gaap_DueToRelatedPartiesCurrent / us-gaap_BalanceSheetLocationAxis = tdw_AccruedExpensesMember / dei_LegalEntityAxis = tdw_SonatideMember
Commissions payable	66,000,000us-gaap_AccruedSalesCommissionCurrent / us-gaap_BalanceSheetLocationAxis = tdw_AccruedExpensesMember / dei_LegalEntityAxis = tdw_SonatideMember	43,000,000us-gaap_AccruedSalesCommissionCurrent / us-gaap_BalanceSheetLocationAxis = tdw_AccruedExpensesMember / dei_LegalEntityAxis = tdw_SonatideMember
Sonatide joint venture | Kwanza-denominated deposits
Commitments and Contingencies Disclosure [Line Items]
Bank deposits maintained	150,000,000us-gaap_DueFromBanks / us-gaap_CashAndCashEquivalentsAxis = tdw_BankDepositMember / dei_LegalEntityAxis = tdw_SonatideMember
Sonatide joint venture | ANGOLA
Commitments and Contingencies Disclosure [Line Items]
Vessel revenues	$ 351,000,000us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO	$ 357,000,000us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO
Percentage of Angolan operation revenue	23.00%tdw_SalesRevenueServicesPercentage / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO	25.00%tdw_SalesRevenueServicesPercentage / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO
Number of vessels operating	80tdw_NumberOfVessel / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO	90tdw_NumberOfVessel / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO
Number of vessels stacked	8tdw_NumberOfVesselsStacked / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO	5tdw_NumberOfVesselsStacked / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO
Ownership percentage requirement of local vessel operators	100.00%tdw_OwnershipPercentageRequirmentOfLocalVesselOperators / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO
Number of vessels transferred out of Angola	13tdw_NumberOfVesselsTransferred / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO
Number of vessels stacked transferred	4tdw_NumberOfVesselsStackedTransferred / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO
Sonatide joint venture | ANGOLA | Increase
Commitments and Contingencies Disclosure [Line Items]
Number of vessels operating		1tdw_NumberOfVessel / dei_LegalEntityAxis = tdw_SonatideMember / tdw_PeriodAxis = tdw_IncreaseMember / us-gaap_StatementGeographicalAxis = country_AO

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