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Share-Based Compensation - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Compensation expense in stock compensation plans	$ 304,373	$ 314,237	$ 597,168	$ 644,541
Income tax benefit of stock compensation plans	63,918	65,990	125,405	135,354
Unrecognized compensation expense related to nonvested share-based compensation granted under the plan	1,000,000.0		$ 1,000,000.0
Weighted average period of unrecognized compensation expense			1 year 7 months 6 days
Cash from option exercises	7,000,000.0	2,200,000	$ 11,400,000	3,100,000
Tax benefit for tax deductions related to option exercises	$ 271,979	$ 54,221	$ 421,135	$ 68,878

X

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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