Stock Repurchase Program - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Nov. 04, 2019
Stockholders Equity Note [Abstract]
Stock repurchase authorized amount					$ 50,000,000.0
Shares repurchased under stock repurchase program	0.0	0.1	0.4	1.3
Shares repurchased during period		$ 600,000	$ 5,400,000	$ 17,900,000
Average price of repurchased stock		$ 15.31	$ 12.23	$ 13.53
Available authorized repurchase amount	$ 22,900,000		$ 22,900,000