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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Statement [Abstract]    
Net sales $ 27,891us-gaap_SalesRevenueNet $ 25,781us-gaap_SalesRevenueNet
Cost of sales 19,325us-gaap_CostOfGoodsSold 18,032us-gaap_CostOfGoodsSold
Gross margin 8,566us-gaap_GrossProfit 7,749us-gaap_GrossProfit
Selling, general and administrative expense 4,866us-gaap_SellingGeneralAndAdministrativeExpense 4,461us-gaap_SellingGeneralAndAdministrativeExpense
Other operating income (expense):    
Insurance recoveries 3,134us-gaap_InsuranceRecoveries 787us-gaap_InsuranceRecoveries
Other income   131us-gaap_OtherOperatingIncomeExpenseNet
Corporate expense (3,830)us-gaap_GeneralAndAdministrativeExpense (4,270)us-gaap_GeneralAndAdministrativeExpense
Income (loss) from operations 3,004us-gaap_OperatingIncomeLoss (64)us-gaap_OperatingIncomeLoss
Equity in earnings of Kronos Worldwide, Inc. 5,605us-gaap_IncomeLossFromEquityMethodInvestments 4,343us-gaap_IncomeLossFromEquityMethodInvestments
Other income:    
Interest and dividend income 302us-gaap_InvestmentIncomeInterestAndDividend 725us-gaap_InvestmentIncomeInterestAndDividend
Income before income taxes 8,911us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 5,004us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax expense (benefit) (1,446)us-gaap_IncomeTaxExpenseBenefit 970us-gaap_IncomeTaxExpenseBenefit
Net income 10,357us-gaap_ProfitLoss 4,034us-gaap_ProfitLoss
Noncontrolling interest in net income of subsidiary 315us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 279us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income attributable to NL stockholders $ 10,042us-gaap_NetIncomeLoss $ 3,755us-gaap_NetIncomeLoss
Amounts attributable to NL stockholders:    
Basic and diluted net income per share $ 0.21us-gaap_EarningsPerShareBasicAndDiluted $ 0.08us-gaap_EarningsPerShareBasicAndDiluted
Weighted average shares used in the calculation of net income per share 48,683us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 48,674us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted