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Financial instruments and fair value measurements (Tables)
 6 Months Ended
Jun. 30, 2013
Fair Value Disclosures [Abstract]  
Summary of Financial Instruments

The following table presents the financial instruments that are not carried at fair value but which require fair value disclosure at December 31, 2012 and June 30, 2013:

 

     December 31, 2012      June 30, 2013  
     Carrying
Amount		      Fair
Value		      Carrying
Amount		      Fair
Value		  
     (in thousands)  

Cash, cash equivalents and restricted cash

    $ 85,035       $ 85,035       $ 77,762       $ 77,762   

CompX promissory note payable to TIMET Finance Management Company

      18,480         18,480         17,980         17,980   

Noncontrolling interest in CompX common stock

      13,268         23,409         13,346         22,922   

NL stockholders’ equity

      374,815         557,259         355,066         549,958