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Income Taxes - Income from Continuing Operations 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]      
U.S. $ 314,150 $ 270,569 $ 231,721
Other than U.S. 48,022 43,173 48,424
Total before tax $ 362,172 $ 313,742 $ 280,145