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Income Taxes - Summary of Components of Income Tax Provision (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]                      
Federal, Current                 $ 130,053 $ 166,758 $ 168,596
Federal, Deferred                 (63,038) 15,596 12,866
Federal income tax provision, Total                 67,015 182,354 181,462
State, Current                 20,070 4,296 20,948
State, Deferred                 2,965 2,553 1,628
State income tax provision, Total                 23,035 6,849 22,576
Income tax provision, Total $ (27,761) $ 42,119 $ 40,725 $ 34,967 $ 49,919 $ 44,272 $ 51,601 $ 43,411 $ 90,050 $ 189,203 $ 204,038