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Income Taxes - Components of Provision for Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Current provision: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 102,516 | $ 248,191 | $ 228,505
State |  |  |  |  |  |  |  |  | 32,638 | 13,092 | 24,336
Total current provision |  |  |  |  |  |  |  |  | 135,154 | 261,283 | 252,841
Deferred (benefit)/provision: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | (57,076) | (58,124) | (89,518)
State |  |  |  |  |  |  |  |  | (6,225) | (628) | 786
Total deferred benefit |  |  |  |  |  |  |  |  | (63,301) | (58,752) | (88,732)
Provision for income tax expense | $ 44,449 | $ (53,667) | $ 40,074 | $ 40,997 | $ 66,190 | $ 40,617 | $ 44,713 | $ 51,011 | $ 71,853 | $ 202,531 | $ 164,109

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