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Income Taxes - U.S. and Foreign Components of Earnings Before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
U.S. $ 249,714 $ 357,445 $ 317,695
Foreign (1,668) 10,444 (1,766)
Income before income tax expense (benefit) $ 248,046 $ 367,889 $ 315,929