Property and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Property and Equipment [Line Items]
Computer software development costs capitalized	$ 11,700	$ 7,100	$ 32,400	$ 22,700
Interest costs incurred	400	300	1,100	1,100
Interest costs capitalized	400	200	1,100	400
Retainage amount included in construction in progress	2,900		2,900		$ 2,200
Depreciation and amortization	7,150	5,665	20,209	15,848
Property and Equipment [Member]
Property and Equipment [Line Items]
Depreciation and amortization	$ 13,800	$ 10,900	$ 39,100	$ 30,500