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Income Taxes - Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Federal, current $ 504,865 $ 286,224 $ 285,856
State, current 37,308 27,353 4,618
Foreign, current 48,386 13,211 5,198
Total current 590,559 326,788 295,672
Federal, deferred (207,006) 71,777 (213,601)
State, deferred (4,533) 5,193 (21,240)
Foreign, deferred (9,634) (5,515) (11,995)
Total deferred (221,173) 71,455 (246,836)
Total provision for income taxes $ 369,386 $ 398,243 $ 48,836