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Income Taxes - Domestic and Foreign Components of Income (loss) Before Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Domestic $ 171,658 $ 123,696 $ 118,871
Foreign 294,993 241,103 123,695
Net income before provision for income taxes and equity in losses of investee $ 466,651 $ 364,799 $ 242,566