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v2.4.1.9

Reclassifications from Accumulated Other Comprehensive Loss to Condensed Consolidated Statement of Income (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income and other, net |  |  |  |  |  |  |  |  | $ 1,927 us-gaap_InvestmentIncomeNonoperating | $ 2,123 us-gaap_InvestmentIncomeNonoperating | $ 3,476 us-gaap_InvestmentIncomeNonoperating
Interest and other debt costs |  |  |  |  |  |  |  |  | (50,029)us-gaap_InterestExpense | (43,814)us-gaap_InterestExpense | (29,745)us-gaap_InterestExpense
Total pre-tax amounts |  |  |  |  |  |  |  |  | (66,267)tdw_IncomeLossFromContinuingOperationsBeforeIncomeTaxes | 173,048 tdw_IncomeLossFromContinuingOperationsBeforeIncomeTaxes | 195,163 tdw_IncomeLossFromContinuingOperationsBeforeIncomeTaxes
Tax effect |  |  |  |  |  |  |  |  | (1,077)us-gaap_IncomeTaxExpenseBenefit | 32,793 us-gaap_IncomeTaxExpenseBenefit | 44,413 us-gaap_IncomeTaxExpenseBenefit
Net earnings (loss) attributable to Tidewater Inc. | (9,076)us-gaap_NetIncomeLoss | (160,694)us-gaap_NetIncomeLoss | 60,907 us-gaap_NetIncomeLoss | 43,673 us-gaap_NetIncomeLoss | 43,417 us-gaap_NetIncomeLoss | 12,583 us-gaap_NetIncomeLoss | 54,172 us-gaap_NetIncomeLoss | 30,083 us-gaap_NetIncomeLoss | (65,190)us-gaap_NetIncomeLoss | 140,255 us-gaap_NetIncomeLoss | 150,750 us-gaap_NetIncomeLoss
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total pre-tax amounts |  |  |  |  |  |  |  |  | 924 tdw_IncomeLossFromContinuingOperationsBeforeIncomeTaxes / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember | 1,186 tdw_IncomeLossFromContinuingOperationsBeforeIncomeTaxes / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember |
Tax effect |  |  |  |  |  |  |  |  |  | 415 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember |
Net earnings (loss) attributable to Tidewater Inc. |  |  |  |  |  |  |  |  | 924 us-gaap_NetIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember | 771 us-gaap_NetIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember |
Reclassification out of Accumulated Other Comprehensive Income | Available for Sale Securities |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income and other, net |  |  |  |  |  |  |  |  | 207 us-gaap_InvestmentIncomeNonoperating / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 469 us-gaap_InvestmentIncomeNonoperating / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Reclassification out of Accumulated Other Comprehensive Income | Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest and other debt costs |  |  |  |  |  |  |  |  | $ 717 us-gaap_InterestExpense / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | $ 717 us-gaap_InterestExpense / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |

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