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Income Taxes - Tax Provision (Benefit) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Federal, Current $ 275,475 $ 172,380 $ 215,703
Federal, Deferred 39,563 27,463 1,559
Federal, Total 315,038 199,843 217,262
State, Current 21,212 20,946 24,476
State, Deferred 5,646 375 861
State, Total 26,858 21,321 25,337
Foreign, Current 123,840 94,909 91,048
Foreign, Deferred 411 (19,411) (12,794)
Foreign, Total 124,251 75,498 78,254
Tax Provision (Benefit), Total $ 466,147 $ 296,662 $ 320,853