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Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Parenthetical) (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
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss) before reclassifications, tax $ 29 $ 58 $ 207 $ 35
Other comprehensive income (loss) before reclassifications, tax (23)    (12)   
Unrealized Gains and (Losses) on Securities Available-for-Sale [Member]
       
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss) before reclassifications, tax     207 35
Other comprehensive income (loss) before reclassifications, tax         
Foreign Currency Translation Adjustments [Member]
       
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss) before reclassifications, tax     $ (12)