Quarterly report pursuant to Section 13 or 15(d)

Earnings per Share - Additional Information (Detail)

v3.20.2
Earnings per Share - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
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, shares issued 23,937      
Total fair value of vested shares $ 231,000      
Share based compensation arrangement by share based payment award equity instruments other than options, grant date Aug. 05, 2020      
Stock options, expiration term from date of grant     3 years  
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 0 0