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Income Taxes - Income From Continuing Operations, Before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
United States $ 72,900 $ 344,300 $ 344,700
Foreign 68,500 63,500 84,500
Income before income taxes $ 141,400 $ 407,800 $ 429,200