Branch Closures and Related Costs - Schedule of Restructuring Activity (Detail)	3 Months Ended	9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)
Restructuring Cost And Reserve [Line Items]
Charge to Income	$ 1,500	$ 1,500,000
Utilized in Cash	700
Reserve	800	800
Retention and Benefits Continuation Costs [Member]
Restructuring Cost And Reserve [Line Items]
Charge to Income	100
Reserve	100	100
Facility Exit Costs [Member]
Restructuring Cost And Reserve [Line Items]
Charge to Income	200
Utilized in Cash	100
Reserve	100	100
Inventory Impairment and Transfer Costs [Member]
Restructuring Cost And Reserve [Line Items]
Charge to Income	700
Utilized in Cash	500
Reserve	200	200
Other Branch Closure Costs [Member]
Restructuring Cost And Reserve [Line Items]
Charge to Income	500
Utilized in Cash	100
Reserve	$ 400	$ 400