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Other comprehensive income (loss)
 3 Months Ended
Mar. 31, 2013
Equity [Abstract]  
Other comprehensive income (loss)

Note 12—Other comprehensive income (loss):

Changes in accumulated other comprehensive income attributable to NL stockholders for the three months ended March 31, 2012 and 2013 are presented in the table below.

 

     Three months ended
March 31,		  
     2012     2013  
     (In thousands)  

Accumulated other comprehensive loss, net of tax:

     

Marketable securities:

     

Balance at beginning of year

    $ 186,451      $ 105,419   

Other comprehensive income (loss)—unrealized gains (losses) arising during the year

      (25,875 )      33,901   
  

 

 

    

 

 

  

Balance at end of period

    $ 160,576      $ 139,320   
  

 

 

    

 

 

  

Currency translation:

     

Balance at beginning of year

    $ (133,041 )    $ (135,165 ) 

Other comprehensive income (loss)—

      4,022        (5,390 ) 
  

 

 

    

 

 

  

Balance at end of period

    $ (129,019 )    $ (140,555 ) 
  

 

 

    

 

 

  

Defined benefit pension plans:

     

Balance at beginning of year

    $ (59,478 )    $ (66,402 ) 

Other comprehensive income (loss)—amortization of prior service cost and net losses included in net periodic pension cost

      565        699   
  

 

 

    

 

 

  

Balance at end of period

    $ (58,913 )    $ (65,703 ) 
  

 

 

    

 

 

  

OPEB plans:

     

Balance at beginning of year

    $ 1,344      $ 895   

Other comprehensive income (loss)—amortization of prior service credit and net losses included in net periodic OPEB cost

      (138 )      (144 ) 
  

 

 

    

 

 

  

Balance at end of period

    $ 1,206      $ 751   
  

 

 

    

 

 

  

Total accumulated other comprehensive loss—

     

Balance at beginning of year

    $ (4,724 )    $ (95,253 ) 

Other comprehensive income (loss)

      (21,426 )      29,066   
  

 

 

    

 

 

  

Balance at end of period

    $ (26,150 )    $ (66,187 ) 
  

 

 

    

 

 

  

See Note 11 for amounts related to our defined benefit pension plans and OPEB plans.