Earnings per Common Share - Additional Information (Detail) - $ / shares	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share Disclosure [Line Items]
Dilutive earnings (loss) per common share (in dollars per share)	$ (0.31)	$ 0.32	$ 0.30	$ 0.50	$ (0.30)	$ 0.10	$ 0.63	$ 0.65	$ 0.82	$ 1.08	$ 0.42
Stock Options
Earnings Per Share Disclosure [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)									0	0	129,000