Branch Closures and Related Costs - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Restructuring Cost And Reserve [Line Items]
Pre-tax charges incurred	$ 1.5	$ 1.5
Closure of Columbus, OH and Selkirk, NY Branches [Member]
Restructuring Cost And Reserve [Line Items]
Branch closures announcement description		During the second quarter of 2020, the Company announced the closure of its Columbus, OH and Selkirk, NY branches to improve operating results and gain operational efficiency through leverage of workforce, logistics and working capital
Pre-tax charges incurred	1.5	$ 1.5
Estimated impairment of inventory and inventory transfer costs	0.7	0.7
Facility exit costs	0.2	0.2
Employee retention and extension of benefits	0.1	0.1
Other branch closure costs	$ 0.5	$ 0.5
Expected substantially completion date of facility closures		Sep. 30, 2020