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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

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