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Other Comprehensive Income - Summary of Other Comprehensive Income (Loss) and Tax Impact (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
Amounts Reclassified Out Of Accumulated Other Comprehensive Income Loss [Abstract]        
Net unrealized gain (loss) on available-for-sale securities, net of income taxes $ 47 $ 130 $ (128) $ 250
Net unrealized gain (loss) on interest rate swaps, net of income taxes 32 (62) 175 (155)
Foreign currency translation (14) (15) (45) (45)
Total other comprehensive income $ 65 $ 53 $ 2 $ 50