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Income Taxes - Income Tax Expense (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Income Tax Disclosure [Abstract] |  |  |  |
Current income tax expense (benefit) | $ 14,480 | $ (1,152) | $ 43,984 | $ 955
Deferred income tax expense (benefit) | (950) | 16,312 | (1,625) | 39,198
Income tax expense, as reported | $ 13,530 | $ 15,160 | $ 42,359 | $ 40,153
Effective tax rate | 10.80% | 11.40% | 11.10% | 10.70%

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