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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, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Federal, Current |  |  |  |  |  |  |  |  | $ (16,610) | $ 63,697 | $ 65,403
Federal, Deferred |  |  |  |  |  |  |  |  | 28,719 | (45,660) | (29,667)
Federal income tax provision, Total |  |  |  |  |  |  |  |  | 12,109 | 18,037 | 35,736
State, Current |  |  |  |  |  |  |  |  | (2,954) | 8,561 | 15,185
State, Deferred |  |  |  |  |  |  |  |  | 7,573 | (10,022) | (6,227)
State income tax provision, Total |  |  |  |  |  |  |  |  | 4,619 | (1,461) | 8,958
Income tax provision, Total | $ 5,869 | $ 6,677 | $ 3,097 | $ 1,085 | $ 3,986 | $ 7,360 | $ 6,744 | $ (1,514) | $ 16,728 | $ 16,576 | $ 44,694

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