Income Taxes - Income Before Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
United States	$ 457,090	$ 505,818	$ 622,214
Foreign	425,435	572,001	472,911
Income before income taxes	$ 882,525	$ 1,077,819	$ 1,095,125	[1]

[1] The Company applied the modified retrospective transition method when adopting ASU 2016-02 "Leases", therefore the Company's 2018 prior results were not restated to reflect ASU 2016-02. Refer to footnote 14.