Summary of Significant Accounting Policies - Shares Used in Computation of Basic and Diluted Per Share Information (Detail) - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Weighted average number of shares outstanding for basic per share calculation (in shares)	31,195,305	31,092,417	30,932,607
Effect of dilutive potential shares:
Nonvested restricted stock (in shares)	201,353	273,348	277,217
Adjusted weighted average shares for diluted per share calculation (in shares)	31,396,658	31,365,765	31,209,824
Antidilutive shares (in shares)	117,238	1,155	157,608