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Income Taxes - Components of Income 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 $ 807,590 $ 575,222 $ 536,709
Foreign 571,416 596,111 345,361
Income before provision for income taxes $ 1,379,006 $ 1,171,333 $ 882,070