Revenue - Percentages of Sales by Product Line (Details) - Product Line - Sales	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Percentage of Sales by Product Line [Line Items]
Percentage of sales	100.00%	100.00%
Fasteners
Percentage of Sales by Product Line [Line Items]
Percentage of sales	34.30%	32.50%
Tools
Percentage of Sales by Product Line [Line Items]
Percentage of sales	8.20%	8.60%
Cutting tools
Percentage of Sales by Product Line [Line Items]
Percentage of sales	5.00%	5.00%
Hydraulics & pneumatics
Percentage of Sales by Product Line [Line Items]
Percentage of sales	6.50%	6.30%
Material handling
Percentage of Sales by Product Line [Line Items]
Percentage of sales	5.60%	5.50%
Janitorial supplies
Percentage of Sales by Product Line [Line Items]
Percentage of sales	7.90%	8.50%
Electrical supplies
Percentage of Sales by Product Line [Line Items]
Percentage of sales	4.40%	4.30%
Welding supplies
Percentage of Sales by Product Line [Line Items]
Percentage of sales	3.70%	3.80%
Safety Supplies
Percentage of Sales by Product Line [Line Items]
Percentage of sales	21.00%	21.50%
Other
Percentage of Sales by Product Line [Line Items]
Percentage of sales	3.40%	4.00%