Income Taxes - Income Before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Domestic	$ 86,572	$ 145,215	$ 61,545
Foreign	267,715	172,834	192,887
Income before income tax expense	$ 354,287	$ 318,049	$ 254,432