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Income Taxes - Summary of Provision for Income Taxes and Corresponding Effective Tax Rate (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] |  |  |  |
Income tax expense | $ 6,771 | $ 3,688 | $ 19,214 | $ 9,807
Earnings before income tax | $ 22,658 | $ 3,333 | $ 46,266 | $ 39,077
Effective tax rate | 29.90% | 110.70% | 41.50% | 25.10%
Income tax expense excluding impairment loss | $ 6,771 | $ 3,688 | $ 19,214 | $ 9,807
Earnings before income tax excluding impairment loss | $ 23,495 | $ 14,809 | $ 67,472 | $ 50,553
Effective tax rate excluding impairment loss | 28.80% | 24.90% | 28.50% | 19.40%

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