Earnings Per Share - Weighted Average Shares and Share Equivalents Used to Calculate Basic and Diluted Earnings Per Share (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Weighted average number of shares outstanding used to calculate basic EPS (in shares)	3,265,914	3,561,374	3,312,145	3,618,724
Dilutive securities:
Stock options and restricted share units (in shares)	205,473	280,559	231,559	273,953
Weighted average number of shares and share equivalents outstanding used to calculate diluted EPS (in shares)	3,471,387	3,841,933	3,543,704	3,892,677