Income Tax - Components of Income Tax (Benefit) Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Current tax provision	$ 19,366	$ 17,207	$ 9,086
Deferred tax benefit	(6,391)	(4,611)	(4,306)
Income tax expense	$ 12,975	$ 12,596	$ 4,780