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Schedule of Deferred Tax Assets and Deferred Tax Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2014
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]    
Accrued employee benefit plan costs $ 21,874us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions $ 21,423us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
Stock based compensation 8,731us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 7,162us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Net operating loss and tax credit carryforwards 2,327us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 2,895us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Other 3,901us-gaap_DeferredTaxAssetsOther 2,896us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets 36,833us-gaap_DeferredTaxAssetsGross 34,376us-gaap_DeferredTaxAssetsGross
Less valuation allowance (17,829)us-gaap_DeferredTaxAssetsValuationAllowance  
Net deferred tax assets 19,004us-gaap_DeferredTaxAssetsNet 34,376us-gaap_DeferredTaxAssetsNet
Depreciation and amortization (19,004)tdw_DeferredTaxLiabilitiesDepreciationAndAmortization (108,929)tdw_DeferredTaxLiabilitiesDepreciationAndAmortization
Gross deferred tax liabilities (19,004)us-gaap_DeferredIncomeTaxLiabilities (108,929)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax assets (liabilities)   $ (74,553)us-gaap_DeferredTaxAssetsLiabilitiesNet