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Income Taxes - Summary of Components of Income Tax Provision (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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

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