Income Tax - Components of Income Tax Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Current tax provision	$ 7,381	$ 6,096	$ 17,633	$ 14,215
Deferred tax benefit	(868)	(2,376)	(2,082)	(4,197)
Income tax expense	$ 6,513	$ 3,720	$ 15,551	$ 10,018