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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 | $ 378,126,000 us-gaap_SalesRevenueServicesNet | $ 360,713,000 us-gaap_SalesRevenueServicesNet | $ 1,150,588,000 us-gaap_SalesRevenueServicesNet | $ 1,056,011,000 us-gaap_SalesRevenueServicesNet |  |  |
Investments in, at equity, and advances to unconsolidated companies | 65,478,000 us-gaap_EquityMethodInvestments |  | 65,478,000 us-gaap_EquityMethodInvestments |  |  |  | 63,928,000 us-gaap_EquityMethodInvestments
Commissions payable | 6,842,000 us-gaap_AccruedSalesCommissionCurrent |  | 6,842,000 us-gaap_AccruedSalesCommissionCurrent |  |  |  | 8,263,000 us-gaap_AccruedSalesCommissionCurrent
Sonatide joint venture |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |
Definitive joint venture agreement term |  |  |  |  | 2 years |  |
Proceeds from related party |  |  | 271,000,000 us-gaap_ProceedsFromContributionsFromAffiliates / dei_LegalEntityAxis = tdw_SonatideMember |  |  |  |
Proceeds from dividends received |  |  | 10,000,000 us-gaap_ProceedsFromDividendsReceived / dei_LegalEntityAxis = tdw_SonatideMember |  |  |  |
Due from related parties | 422,000,000 us-gaap_DueFromAffiliates / dei_LegalEntityAxis = tdw_SonatideMember |  | 422,000,000 us-gaap_DueFromAffiliates / dei_LegalEntityAxis = tdw_SonatideMember |  |  |  |
Number of vessels operating | 9 tdw_NumberOfVessel / dei_LegalEntityAxis = tdw_SonatideMember |  | 9 tdw_NumberOfVessel / dei_LegalEntityAxis = tdw_SonatideMember |  |  |  |
Number of vessels stacked | 3 tdw_NumberOfVesselsStacked / dei_LegalEntityAxis = tdw_SonatideMember |  | 3 tdw_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 | 64,000,000 us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = tdw_SonatideMember |  | 64,000,000 us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = tdw_SonatideMember |  |  |  | 62,000,000 us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = tdw_SonatideMember
Deposits in Angolan banks, largely related to customer receipts | 95,000,000 us-gaap_Cash / dei_LegalEntityAxis = tdw_SonatideMember |  | 95,000,000 us-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 |  |  | 125,000,000 us-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 |  |  | 146,000,000 us-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 |  |  | 271,000,000 us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO | 261,000,000 us-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 | 83 tdw_NumberOfVessel / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO | 90 tdw_NumberOfVessel / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO | 83 tdw_NumberOfVessel / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO | 90 tdw_NumberOfVessel / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO |  |  |
Number of vessels stacked | 4 tdw_NumberOfVesselsStacked / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO | 5 tdw_NumberOfVesselsStacked / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO | 4 tdw_NumberOfVesselsStacked / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO | 5 tdw_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 |  |  | 10 tdw_NumberOfVesselsTransferred / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO |  |  |  |
Number of vessels stacked transferred | 4 tdw_NumberOfVesselsStackedTransferred / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO |  | 4 tdw_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 |  |  |  |  |  |  | 1 tdw_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 | 422,000,000 us-gaap_DueFromRelatedPartiesCurrent / us-gaap_BalanceSheetLocationAxis = tdw_TradeAndOtherReceivablesMember / dei_LegalEntityAxis = tdw_SonatideMember |  | 422,000,000 us-gaap_DueFromRelatedPartiesCurrent / us-gaap_BalanceSheetLocationAxis = tdw_TradeAndOtherReceivablesMember / dei_LegalEntityAxis = tdw_SonatideMember |  |  |  | 430,000,000 us-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 | 158,000,000 us-gaap_DueToRelatedPartiesCurrent / us-gaap_BalanceSheetLocationAxis = tdw_AccruedExpensesMember / dei_LegalEntityAxis = tdw_SonatideMember |  | 158,000,000 us-gaap_DueToRelatedPartiesCurrent / us-gaap_BalanceSheetLocationAxis = tdw_AccruedExpensesMember / dei_LegalEntityAxis = tdw_SonatideMember |  |  |  | 86,000,000 us-gaap_DueToRelatedPartiesCurrent / us-gaap_BalanceSheetLocationAxis = tdw_AccruedExpensesMember / dei_LegalEntityAxis = tdw_SonatideMember
Commissions payable | $ 58,000,000 us-gaap_AccruedSalesCommissionCurrent / us-gaap_BalanceSheetLocationAxis = tdw_AccruedExpensesMember / dei_LegalEntityAxis = tdw_SonatideMember |  | $ 58,000,000 us-gaap_AccruedSalesCommissionCurrent / us-gaap_BalanceSheetLocationAxis = tdw_AccruedExpensesMember / dei_LegalEntityAxis = tdw_SonatideMember |  |  |  | $ 43,000,000 us-gaap_AccruedSalesCommissionCurrent / us-gaap_BalanceSheetLocationAxis = tdw_AccruedExpensesMember / dei_LegalEntityAxis = tdw_SonatideMember

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