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Financial Instruments and Fair Value Measurements - Summary of Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
CompX promissory note payable to TIMET Finance Management Company    $ 18,480
Noncontrolling interest in CompX common stock 13,520 13,268
NL stockholders’ equity 407,316 374,815
Carrying Amount
   
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash, cash equivalents and restricted cash 57,216 85,035
CompX promissory note payable to TIMET Finance Management Company   18,480
Noncontrolling interest in CompX common stock 13,520 13,268
NL stockholders’ equity 407,316 374,815
Fair Value
   
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash, cash equivalents and restricted cash 57,216 85,035
CompX promissory note payable to TIMET Finance Management Company   18,480
Noncontrolling interest in CompX common stock 21,313 23,409
NL stockholders’ equity $ 552,449 $ 557,259