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Income Taxes - Components of 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: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 18,030 | $ (12,754) | $ 6,259
State |  |  |  |  |  |  |  |  | 108 | 169 | 96
Total current |  |  |  |  |  |  |  |  | 18,138 | (12,585) | 6,355
Deferred: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | (4,568) | 35,440 | 5,798
State |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total deferred |  |  |  |  |  |  |  |  | (4,568) | 35,440 | 5,798
Income tax expense (benefit) | $ 4,269 | $ 5,278 | $ 3,018 | $ 1,005 | $ 10,186 | $ 5,700 | $ 3,170 | $ 3,799 | $ 13,570 | $ 22,855 | $ 12,153

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