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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Pension liability $ 10,976mdr_DeferredTaxAssetsPension $ 16,658mdr_DeferredTaxAssetsPension
Accrued liabilities for incentive compensation 19,015us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation 15,032us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
Net operating loss carryforward 294,722us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 259,600us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
State net operating loss carryforward 21,296us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 24,679us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Long-term contracts 39,817mdr_DeferredTaxAssetsLongTermContracts 13,504mdr_DeferredTaxAssetsLongTermContracts
Other 1,549us-gaap_DeferredTaxAssetsOther 4,936us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 387,375us-gaap_DeferredTaxAssetsGross 334,409us-gaap_DeferredTaxAssetsGross
Valuation allowance for deferred tax assets (331,589)us-gaap_DeferredTaxAssetsValuationAllowance (292,388)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets 55,786us-gaap_DeferredTaxAssetsNet 42,021us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:    
Property, plant and equipment 28,815us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 19,115us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Prepaid drydock 10,280us-gaap_DeferredTaxLiabilitiesPrepaidExpenses 13,025us-gaap_DeferredTaxLiabilitiesPrepaidExpenses
Investments in joint ventures and affiliated companies 13,583us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates 8,354us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates
Unrealized exchange gains and other 3,162us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains 3,236us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains
Total deferred tax liabilities 55,840us-gaap_DeferredIncomeTaxLiabilities 43,730us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax liability 54us-gaap_DeferredTaxLiabilities 1,709us-gaap_DeferredTaxLiabilities
Deferred tax assets and liabilities in the accompanying consolidated balance sheets include:    
Current deferred tax assets 7,514mdr_DeferredTaxAssetsNetContinuingOperationsCurrent 7,091mdr_DeferredTaxAssetsNetContinuingOperationsCurrent
Noncurrent deferred tax assets 17,313mdr_DeferredTaxAssetsNetContinuingOperationsNoncurrent 16,766mdr_DeferredTaxAssetsNetContinuingOperationsNoncurrent
Total 24,827mdr_DeferredTaxAssetsNetContinuingOperations 23,857mdr_DeferredTaxAssetsNetContinuingOperations
Current deferred tax liabilities 19,753mdr_DeferredTaxLiabilitiesNetContinuingOperationsCurrent 17,892mdr_DeferredTaxLiabilitiesNetContinuingOperationsCurrent
Noncurrent deferred tax liabilities 5,128mdr_DeferredTaxLiabilitiesNetContinuingOperationsNoncurrent 7,674mdr_DeferredTaxLiabilitiesNetContinuingOperationsNoncurrent
Total 24,881mdr_DeferredIncomeTaxLiabilitiesContinuingOperations 25,566mdr_DeferredIncomeTaxLiabilitiesContinuingOperations
Net deferred tax liability $ 54us-gaap_DeferredTaxLiabilities $ 1,709us-gaap_DeferredTaxLiabilities