Quarterly report pursuant to Section 13 or 15(d)

Earnings per Share - Additional Information (Detail)

v3.21.2
Earnings per Share - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
2013 Equity Compensation Plan | Performance Stock Units      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Share-based compensation arrangement by share-based payment award, additional shares issued 0   42,626
Total fair value of vested shares     $ 784,000
Share based compensation arrangement by share based payment award equity instruments other than options, grant date     Mar. 24, 2021
Stock options, expiration term from date of grant     3 years
Share-based compensation arrangement by share based payment award, performance stock units outstanding 66,563 0 66,563
Share-based compensation arrangement by share based payment award, performance stock units aggregate grant fair value     $ 1,000
Stock option awards      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation of diluted EPS (shares) 0 0