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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Tax Disclosure [Abstract]        
Provision for Income Taxes $ 38,980 $ 7,392 $ 79,390 $ 30,327
Effective Income Tax Rate Reconciliation, Percent 45.00% 58.00% 47.00% 52.00%
Increase (decrease) in deferred tax assets, changes in unrealized gain (loss) on marketable securities     $ 519 $ 530
Increase (decrease) in deferred tax assets, changes in foreign currency translation adjustments     $ 6,306 $ 4,661