Coronavirus Pandemic (COVID-19) - Additional Information (Detail) - COVID-19 [Member] - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020	Mar. 27, 2020
Reimbursement of Lost Revenue			$ 100,000.0
Proceeds From Contribution In Aid Of Reimbursement of Lost Revenue	$ 7.7	$ 22.0
2020 Tax Year [Member]
Percentage of refund of income tax at the prior period corporate tax rate	35.00%
Rural Area [Member]
Reimbursement of Lost Revenue			$ 70,000.0
Executive Officer [Member]
Decrease In Salary | %	50.00%