Income Taxes - Components of Income Before Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Domestic	$ 839,899	$ 807,590	$ 575,222
Foreign	521,446	571,416	596,111
Income before provision for income taxes	$ 1,361,345	$ 1,379,006	$ 1,171,333