Annual report pursuant to Section 13 and 15(d)

Provision for Federal and Foreign Income Tax Expense for Continuing Operations (Detail)

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Provision for Federal and Foreign Income Tax Expense for Continuing Operations (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Income before income taxes, U.S. $ 289,727 $ 280,535 $ 274,756
Income before income taxes, Foreign 21,007 64,842 85,890
Income before income taxes $ 310,734 $ 345,377 $ 360,646