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Components of Income Tax Expense Benefit (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Current, Federal $ 352,433 $ 368,957 $ 363,734
Current, Foreign 10,625 8,513 3,151
Current, State 37,421 42,166 38,987
Current, Total 400,479 419,636 405,872
Deferred, Federal (36,998) (12,092) (15,912)
Deferred, Foreign 24 2,463 5,545
Deferred, State 192 (820) (302)
Deferred, Total (36,782) (10,449) (10,669)
Provision for income taxes $ 363,697 $ 409,187 $ 395,203