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Schedule of Accumulated Other Comprehensive Loss (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Current period other comprehensive loss     $ 109    
Ending balance, Foreign currency translation adjustment 109   109    
Beginning balance, Available-for-sale securities     352 355  
Current period other comprehensive income (loss) 15 (23) 27 (20)  
Ending balance, Available-for-sale securities 325 375 325 375  
Beginning balance, Derivative instrument       238  
Current period other comprehensive income   77   221  
Ending balance, Derivative instrument   17   17  
Accumulated other comprehensive loss, net of tax $ 434 $ 392 $ 434 $ 392 $ 352