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Component of Accumulated Other Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at December 31, 2012     $ 31,046  
Other comprehensive income (loss) 25,402 14,248 13,576 13,891
Balance at September 30, 2013 44,622   44,622  
Foreign Currency Translation Adjustments [Member]
       
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at December 31, 2012     31,046  
Other comprehensive income (loss)     13,576  
Balance at September 30, 2013 $ 44,622   $ 44,622