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Earnings per Common Share - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
May 04, 2020
Debt Instrument [Line Items]          
Antidilutive securities excluded from computation of earnings per share (in shares) 0 0 1,848,000 0  
Convertible Senior Notes          
Debt Instrument [Line Items]          
Debt instrument, face amount         $ 258,750,000
Debt instrument, interest rate, stated percentage         2.75%
Debt instrument, convertible, conversion price (in dollars per share) $ 17.62   $ 17.62