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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Disclosure Income Taxes Additional Information [Abstract]    
Provision for Income Taxes $ 7,563 $ 7,735
Effective tax rate (as a percent) 36.00% 45.00%
Increase (decrease) in deferred tax assets, changes in unrealized gain (loss) on marketable securities (535) (278)
Increase (decrease) in deferred tax assets, changes in foreign currency translation adjustments (136) 292
Unrecognized Tax Benefits 623  
Unrecognized tax benefits that would affect the effective tax rate 474  
Income tax penalties and interest expense 17  
Income tax penalties and interest accrued $ 232