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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Federal, Current |  |  |  |  |  |  |  |  | $ 97,754 | $ 130,053 | $ 166,758
Federal, Deferred |  |  |  |  |  |  |  |  | (20,176) | (63,038) | 15,596
Federal income tax provision, Total |  |  |  |  |  |  |  |  | 77,578 | 67,015 | 182,354
State, Current |  |  |  |  |  |  |  |  | 26,605 | 20,070 | 4,296
State, Deferred |  |  |  |  |  |  |  |  | (3,973) | 2,965 | 2,553
State income tax provision, Total |  |  |  |  |  |  |  |  | 22,632 | 23,035 | 6,849
Income tax provision, Total | $ 21,156 | $ 24,873 | $ 30,122 | $ 24,059 | $ (27,761) | $ 42,119 | $ 40,725 | $ 34,967 | $ 100,210 | $ 90,050 | $ 189,203

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