Earnings Per Share - Weighted Average Shares and Share Equivalents Used to Calculate Basic and Diluted Earnings Per Share (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Weighted average number of shares outstanding used to calculate basic EPS (in shares)	3,262,529	3,286,574	3,250,960	3,335,644
Dilutive securities:
Stock options and restricted share units (in shares)	204,407	217,730	205,446	244,445
Weighted average number of shares and share equivalents outstanding used to calculate diluted EPS (in shares)	3,466,936	3,504,304	3,456,406	3,580,089