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Earnings per Common Share - Additional Information (Detail) - $ / shares
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share Disclosure [Line Items]                      
Dilutive earnings (loss) per common share (in dollars per share) $ (0.43) $ 0.54 $ (1.78) $ 0.30 $ (0.31) $ 0.32 $ 0.30 $ 0.50 $ (1.35) $ 0.82 $ 1.08
Antidilutive securities excluded from computation of earnings per share (in shares)                 2,088,000    
Stock Options                      
Earnings Per Share Disclosure [Line Items]                      
Antidilutive securities excluded from computation of earnings per share (in shares)                 0 0