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Restricted Stock, Stock Options and Other Stock Plans - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average remaining contractual term of unexercised stock options (in years)			6 years
Unrecognized compensation cost related to stock options and restricted stock awards	$ 1.2		$ 1.2		$ 1.1
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued by the company (in shares)	0	0	0	0
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued by the company (in shares)	165,809	630,352	165,809	630,352

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