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Investment in Unconsolidated Companies (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2013
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Schedule of Equity Method Investments [Line Items] |  |  |
Investments in, at equity, and advances to unconsolidated companies | $ 65,844 us-gaap_EquityMethodInvestmentUnderlyingEquityInNetAssets | $ 63,928 us-gaap_EquityMethodInvestmentUnderlyingEquityInNetAssets |
Sonatide Marine, Ltd. |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage in unconsolidated affiliates | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = tdw_SonatideMarineLtdMember |  |
Investments in, at equity, and advances to unconsolidated companies | 63,893 us-gaap_EquityMethodInvestmentUnderlyingEquityInNetAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = tdw_SonatideMarineLtdMember | 62,126 us-gaap_EquityMethodInvestmentUnderlyingEquityInNetAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = tdw_SonatideMarineLtdMember |
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
Investments in, at equity, and advances to unconsolidated companies | $ 1,951 us-gaap_EquityMethodInvestmentUnderlyingEquityInNetAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = tdw_DtdwHoldingsLtdMember | $ 1,802 us-gaap_EquityMethodInvestmentUnderlyingEquityInNetAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = tdw_DtdwHoldingsLtdMember |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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