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Schedule of Other Liabilities and Deferred Credits (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Mar. 31, 2014
Other Assets, Accrued Expenses, Other Current Liabilities, And Other Liabilities And Deferred Credits [Abstract]    
Postretirement benefits liability $ 20,992us-gaap_OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent $ 23,185us-gaap_OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent
Pension liabilities 34,746tdw_PensionPlanLiabilitiesNoncurrent 35,234tdw_PensionPlanLiabilitiesNoncurrent
Deferred gain on vessel sales 135,044us-gaap_SaleLeasebackTransactionDeferredGainNet 85,316us-gaap_SaleLeasebackTransactionDeferredGainNet
Other 35,945tdw_OtherLiabilitiesCreditsNoncurrent 35,469tdw_OtherLiabilitiesCreditsNoncurrent
Other liabilities and deferred credits $ 226,727us-gaap_OtherLiabilitiesNoncurrent $ 179,204us-gaap_OtherLiabilitiesNoncurrent