Earnings Per Share - Computation of Earnings Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Net income	$ 20,374	$ 33,649
Average number of common shares outstanding (in shares)	30,050	29,727
Effect of dilutive stock options and restricted stock (in shares)	152	178
Average number of common shares outstanding used to calculate diluted earnings per share (in shares)	30,202	29,905
Options excluded from diluted earnings per share because of their antidilutive effect (in shares)	0	0