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Total Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning balance     $ (6,499)  
Current period other comprehensive income (loss) $ 1 $ 1,224 (386) $ 1,213
Ending balance (6,885)   (6,885)  
Net Unrealized Loss on Securities Available-for-sale        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning balance     (490)  
Current period other comprehensive income (loss)     (16)  
Ending balance (506)   (506)  
Foreign Currency Translation Adjustments        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning balance     (6,009)  
Current period other comprehensive income (loss)     1,462  
Ending balance (4,547)   (4,547)  
Unrealized Foreign Exchange Loss on Intercompany Balance        
Accumulated Other Comprehensive Income Loss [Line Items]        
Current period other comprehensive income (loss)     (1,832)  
Ending balance $ (1,832)   $ (1,832)