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Commitments and Contingencies (Sonatide Joint Venture) - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Nov. 30, 2013	Feb. 28, 2014	Mar. 31, 2014
Commitments and Contingencies Disclosure [Line Items]
Vessel revenues	$ 378,126,000us-gaap_SalesRevenueServicesNet	$ 360,713,000us-gaap_SalesRevenueServicesNet	$ 1,150,588,000us-gaap_SalesRevenueServicesNet	$ 1,056,011,000us-gaap_SalesRevenueServicesNet
Investments in, at equity, and advances to unconsolidated companies	65,478,000us-gaap_EquityMethodInvestments		65,478,000us-gaap_EquityMethodInvestments				63,928,000us-gaap_EquityMethodInvestments
Commissions payable	6,842,000us-gaap_AccruedSalesCommissionCurrent		6,842,000us-gaap_AccruedSalesCommissionCurrent				8,263,000us-gaap_AccruedSalesCommissionCurrent
Sonatide joint venture
Commitments and Contingencies Disclosure [Line Items]
Definitive joint venture agreement term					2 years
Proceeds from related party			271,000,000us-gaap_ProceedsFromContributionsFromAffiliates / dei_LegalEntityAxis = tdw_SonatideMember
Proceeds from dividends received			10,000,000us-gaap_ProceedsFromDividendsReceived / dei_LegalEntityAxis = tdw_SonatideMember
Due from related parties	422,000,000us-gaap_DueFromAffiliates / dei_LegalEntityAxis = tdw_SonatideMember		422,000,000us-gaap_DueFromAffiliates / dei_LegalEntityAxis = tdw_SonatideMember
Number of vessels operating	9tdw_NumberOfVessel / dei_LegalEntityAxis = tdw_SonatideMember		9tdw_NumberOfVessel / dei_LegalEntityAxis = tdw_SonatideMember
Number of vessels stacked	3tdw_NumberOfVesselsStacked / dei_LegalEntityAxis = tdw_SonatideMember		3tdw_NumberOfVesselsStacked / dei_LegalEntityAxis = tdw_SonatideMember
Ownership Interest In Joint Venture	49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = tdw_SonatideMember		49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = tdw_SonatideMember
Investments in, at equity, and advances to unconsolidated companies	64,000,000us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = tdw_SonatideMember		64,000,000us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = tdw_SonatideMember				62,000,000us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = tdw_SonatideMember
Deposits in Angolan banks, largely related to customer receipts	95,000,000us-gaap_Cash / dei_LegalEntityAxis = tdw_SonatideMember		95,000,000us-gaap_Cash / dei_LegalEntityAxis = tdw_SonatideMember
Sonatide joint venture | Dollars held by Sonatide that did not need to be converted to U.S dollars prior to payment to Tidewater
Commitments and Contingencies Disclosure [Line Items]
Proceeds from related party			125,000,000us-gaap_ProceedsFromContributionsFromAffiliates / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementScenarioAxis = tdw_ScenarioOneMember
Sonatide joint venture | Sonatide's converting kwanzas into dollars and subsequent payment to Tidewater
Commitments and Contingencies Disclosure [Line Items]
Proceeds from related party			146,000,000us-gaap_ProceedsFromContributionsFromAffiliates / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementScenarioAxis = tdw_ScenarioTwoMember
Sonatide joint venture | United States of America, Dollars
Commitments and Contingencies Disclosure [Line Items]
Customer agreements that contain split currency						70.00%tdw_PercentageOfPaymentAgreement / us-gaap_CurrencyAxis = currency_USD / dei_LegalEntityAxis = tdw_SonatideMember
Sonatide joint venture | Angola, Kwanza
Commitments and Contingencies Disclosure [Line Items]
Customer agreements that contain split currency						30.00%tdw_PercentageOfPaymentAgreement / us-gaap_CurrencyAxis = currency_AOA / dei_LegalEntityAxis = tdw_SonatideMember
Sonatide joint venture | ANGOLA
Commitments and Contingencies Disclosure [Line Items]
Vessel revenues			271,000,000us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO	261,000,000us-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	83tdw_NumberOfVessel / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO	90tdw_NumberOfVessel / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO	83tdw_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	4tdw_NumberOfVesselsStacked / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO	5tdw_NumberOfVesselsStacked / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO	4tdw_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			10tdw_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		4tdw_NumberOfVesselsStackedTransferred / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO
Sonatide joint venture | Increase | ANGOLA
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
Sonatide joint venture | Trade and other receivables
Commitments and Contingencies Disclosure [Line Items]
Due from related parties	422,000,000us-gaap_DueFromRelatedPartiesCurrent / us-gaap_BalanceSheetLocationAxis = tdw_TradeAndOtherReceivablesMember / dei_LegalEntityAxis = tdw_SonatideMember		422,000,000us-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	158,000,000us-gaap_DueToRelatedPartiesCurrent / us-gaap_BalanceSheetLocationAxis = tdw_AccruedExpensesMember / dei_LegalEntityAxis = tdw_SonatideMember		158,000,000us-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	$ 58,000,000us-gaap_AccruedSalesCommissionCurrent / us-gaap_BalanceSheetLocationAxis = tdw_AccruedExpensesMember / dei_LegalEntityAxis = tdw_SonatideMember		$ 58,000,000us-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

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