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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Tax Disclosure [Abstract]    
Provision for Income Taxes $ 9,734 $ 6,212
Effective Income Tax Rate Reconciliation, Percent 56.00% 51.00%
Increase (decrease) in deferred tax assets, changes in unrealized gain (loss) on marketable securities $ (8) $ 445
Increase (decrease) in deferred tax assets, changes in foreign currency translation adjustments $ 1,183 $ 2,211