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Stockholders' Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | May 31, 2014 | Mar. 31, 2013
Stockholders Equity Note [Line Items] |  |  |  |  |
Amount remaining authorized to repurchase shares | $ 100 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  | 100 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |
September 2010 Senior Unsecured Notes |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Accumulated other comprehensive loss related to hedges, after-tax loss relating to interest rate hedges | 1.8 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwentyTenSeniorUnsecuredNotesMember | 2.4 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwentyTenSeniorUnsecuredNotesMember |  |  |
Accumulated other comprehensive loss related to hedges, pre-tax loss relating to interest rate hedges | 2.6 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwentyTenSeniorUnsecuredNotesMember | 3.7 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwentyTenSeniorUnsecuredNotesMember |  |  |
May 2014 Authorized Amount |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Amount remaining authorized to repurchase shares | 100 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_ShareRepurchaseProgramAxis = tdw_MayTwoThousandFourteenAuthorizedAmountMember |  | 100 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_ShareRepurchaseProgramAxis = tdw_MayTwoThousandFourteenAuthorizedAmountMember |  |
Amount authorized to repurchase shares |  |  |  | 200 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = tdw_MayTwoThousandFourteenAuthorizedAmountMember |
May 2013 Authorized Amount |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Amount authorized to repurchase shares |  |  |  |  | 200 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = tdw_MayTwoThousandThirteenAuthorizedAmountMember
Number of Shares Authorized to be Repurchased |  |  | 0 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = tdw_MayTwoThousandThirteenAuthorizedAmountMember |  |
May Two Thousand Fifteen Authorized Amount |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Amount remaining authorized to repurchase shares | $ 100 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_ShareRepurchaseProgramAxis = tdw_MayTwoThousandFifteenAuthorizedAmountMember |  | 100 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_ShareRepurchaseProgramAxis = tdw_MayTwoThousandFifteenAuthorizedAmountMember |  |

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- Definition Amount before tax, after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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- Definition Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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