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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Weighted average number of shares outstanding used to calculate basic EPS (in shares)	3,286,574	3,622,635	3,335,644	3,647,874
Dilutive securities:
Stock options and restricted share units (in shares)	217,730	274,074	244,445	269,230
Weighted average number of shares and share equivalents outstanding used to calculate diluted EPS (in shares)	3,504,304	3,896,709	3,580,089	3,917,104