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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 | $ 1,468,358,000 us-gaap_SalesRevenueServicesNet | $ 1,418,461,000 us-gaap_SalesRevenueServicesNet | $ 1,229,998,000 us-gaap_SalesRevenueServicesNet |  |
Number of vessels operating | 263 tdw_NumberOfVessel | 272 tdw_NumberOfVessel |  |  |
Investments in, at equity, and advances to unconsolidated companies | 65,844,000 us-gaap_EquityMethodInvestments | 63,928,000 us-gaap_EquityMethodInvestments | 46,047,000 us-gaap_EquityMethodInvestments |  |
Commissions payable | 8,282,000 us-gaap_AccruedSalesCommissionCurrent | 8,263,000 us-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 | 338,000,000 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 | 420,000,000 us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = tdw_SonatideMember |  |  |  |
Number of vessels operating | 10 tdw_NumberOfVessel / dei_LegalEntityAxis = tdw_SonatideMember |  |  |  |
Number of vessels stacked | 3 tdw_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 | 67,000,000 us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = tdw_SonatideMember | 62,000,000 us-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 | 159,000,000 us-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 | 179,000,000 us-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 | 420,000,000 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 | 186,000,000 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 | 66,000,000 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 |  |  |
Sonatide joint venture | Kwanza-denominated deposits |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Bank deposits maintained | 150,000,000 us-gaap_DueFromBanks / us-gaap_CashAndCashEquivalentsAxis = tdw_BankDepositMember / dei_LegalEntityAxis = tdw_SonatideMember |  |  |  |
Sonatide joint venture | ANGOLA |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Vessel revenues | $ 351,000,000 us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = tdw_SonatideMember / us-gaap_StatementGeographicalAxis = country_AO | $ 357,000,000 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 | 80 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 | 8 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 | 13 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 |  |  |  |
Sonatide joint venture | ANGOLA | Increase |  |  |  |  |
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 |  |  |

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