Goodwill and Intangible Assets - Schedule of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Balance at beginning of period	$ 153,397	$ 107,187
Acquisition during period	42,522	46,210
Balance at end of period	$ 195,919	$ 153,397