Income Tax - Components of Income Tax Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Current tax provision	$ 4,654	$ 3,428	$ 10,252	$ 8,119
Deferred tax benefit	(134)	(939)	(1,214)	(1,821)
Income tax expense	$ 4,520	$ 2,489	$ 9,038	$ 6,298