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Income Taxes - Components of Income (Loss) from Continuing Operations (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Domestic $ 577,098 $ 536,869 $ 600,939
Foreign 586,995 343,857 278,791
Income before provision for income taxes $ 1,164,093 $ 880,726 $ 879,730