Earnings Per Share - Weighted Average Shares and Share Equivalents Used to Calculate Basic and Diluted Earnings Per Share (Detail) - shares	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share [Abstract]
Weighted average number of shares outstanding used to calculate basic EPS (in shares)	3,239,263	3,385,259
Dilutive securities:
Stock options and restricted share units (in shares)	208,211	270,258
Weighted average number of shares and share equivalents outstanding used to calculate diluted EPS (in shares)	3,447,474	3,655,517