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Financial Instruments and Fair Value Measurements - Summary of Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Noncontrolling interest in CompX common stock $ 14,283 $ 13,615
NL stockholders' equity 263,347 355,380
Carrying Amount
   
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash, cash equivalents and restricted cash 77,987 57,639
Noncontrolling interest in CompX common stock 14,283 13,615
NL stockholders' equity 263,347 355,380
Fair Value
   
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash, cash equivalents and restricted cash 77,987 57,639
Noncontrolling interest in CompX common stock 16,985 23,119
NL stockholders' equity $ 358,306 $ 544,174