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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

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