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Income Taxes - Summary of Provision for Income Taxes and Corresponding Effective Tax Rate (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income tax expense	$ 5,406	$ 6,895
Earnings before income tax	$ 17,279	$ 15,309
Effective tax rate	31.30%	45.00%
Earnings before income tax excluding impairment loss	$ 17,279	$ 25,793
Effective tax rate excluding impairment loss	31.30%	26.70%

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