Summary of Significant Accounting Policies - Weighted Average Shares and Share Equivalents Used to Calculate Basic and Diluted Earnings Per Share (Detail) - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Weighted average number of shares outstanding used to calculate basic EPS (in Shares)	3,580,800	3,691,987	3,640,688
Dilutive securities:
Stock options and restricted share units (in Shares)	278,112	224,674	332,339
Weighted average number of shares and share equivalents outstanding used to calculate diluted EPS (in Shares)	3,858,912	3,916,661	3,973,027