Business Acquisitions - Summary of Supplemental Unaudited Pro-Forma Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues	$ 328,243	$ 233,854	$ 188,805
Net (loss) income	(57,949)	(23,557)	(16,491)
Acquisition Proforma
Revenues	31,253	135,565	116,873
Net (loss) income	10,288	38,903	24,486
Consolidated Proforma
Revenues	359,496	369,419	305,678
Net (loss) income	$ (47,661)	$ 15,346	$ 7,995