Summary of Significant Accounting Policies - Summary of Corporate Technology and Production Systems Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Corporate Technology And Production Systems [Abstract]
Corporate information technology	$ 6,122	$ 4,696	$ 15,611	$ 14,902
Development of platform and product initiatives	3,906	4,150	11,242	12,170
Production support and maintenance	2,056	1,996	5,582	5,850
Total production systems	5,962	6,146	16,824	18,020
Corporate technology and production systems	$ 12,084	$ 10,842	$ 32,435	$ 32,922