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Financial Instruments - Summary of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Noncontrolling interest in CompX common stock	$ 14,428us-gaap_MinorityInterest	$ 13,615us-gaap_MinorityInterest
NL stockholders' equity	237,022us-gaap_StockholdersEquity	355,380us-gaap_StockholdersEquity
Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash, cash equivalents and restricted cash	77,975	57,639
Noncontrolling interest in CompX common stock	14,428	13,615
NL stockholders' equity	237,022	355,380
Fair Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash, cash equivalents and restricted cash	77,975	57,639
Noncontrolling interest in CompX common stock	19,936	23,119
NL stockholders' equity	$ 418,673	$ 544,174

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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