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, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Weighted average number of shares outstanding used to calculate basic EPS (in shares)	3,385,259	3,673,394
Dilutive securities:
Stock options and restricted share units (in shares)	270,258	262,095
Weighted average number of shares and share equivalents outstanding used to calculate diluted EPS (in shares)	3,655,517	3,935,489