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Income Taxes - Components of Net Deferred Tax Liability (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Tax effect of temporary differences related to:    
Inventories $ 800,000us-gaap_DeferredTaxAssetsInventory $ 900,000us-gaap_DeferredTaxAssetsInventory
Accrued OPEB costs 1,400,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits 1,300,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
Accrued pension costs 4,400,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions 1,700,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
Accrued environmental liabilities 38,900,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsContingencies 40,100,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsContingencies
Other accrued liabilities and deductible differences 2,600,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 2,500,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Tax loss and tax credit carryforwards 2,200,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 1,800,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Adjusted gross deferred tax assets (liabilities) 50,300,000us-gaap_DeferredTaxAssetsNet 48,300,000us-gaap_DeferredTaxAssetsNet
Netting of items by tax jurisdiction (45,700,000)nl_DeferredTaxAssetNettingByJurisdiction (44,500,000)nl_DeferredTaxAssetNettingByJurisdiction
Total deferred tax assets 4,600,000us-gaap_DeferredTaxAssetsLiabilitiesNet 3,800,000us-gaap_DeferredTaxAssetsLiabilitiesNet
Deferred income taxes 4,567,000us-gaap_DeferredTaxAssetsNetCurrent 3,786,000us-gaap_DeferredTaxAssetsNetCurrent
Marketable securities (31,900,000)us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities (88,100,000)us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities
Property and equipment (4,600,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (4,100,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Other taxable differences (6,800,000)us-gaap_DeferredTaxLiabilitiesOther (7,700,000)us-gaap_DeferredTaxLiabilitiesOther
Investment in Kronos Worldwide, Inc. (90,100,000)us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates (106,500,000)us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates
Adjusted gross deferred tax assets (liabilities) (133,400,000)nl_AdjustedGrossDeferredTaxLiabilityBeforeNettingByJurisdiction (206,400,000)nl_AdjustedGrossDeferredTaxLiabilityBeforeNettingByJurisdiction
Netting of items by tax jurisdiction 45,700,000nl_DeferredTaxLiabilityNettingByJurisdiction 44,500,000nl_DeferredTaxLiabilityNettingByJurisdiction
Total deferred tax liabilities (87,700,000)us-gaap_DeferredTaxLiabilities (161,900,000)us-gaap_DeferredTaxLiabilities
Net noncurrent deferred tax liability $ (87,725,000)us-gaap_DeferredTaxLiabilitiesNoncurrent $ (161,933,000)us-gaap_DeferredTaxLiabilitiesNoncurrent