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Revenue - Percentages of Sales by Product Line (Details) - Product Line - Sales	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
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	32.50%	32.90%
Tools
Percentage of Sales by Product Line [Line Items]
Percentage of sales	8.60%	9.40%
Cutting tools
Percentage of Sales by Product Line [Line Items]
Percentage of sales	5.00%	5.40%
Hydraulics & pneumatics
Percentage of Sales by Product Line [Line Items]
Percentage of sales	6.30%	6.60%
Material handling
Percentage of Sales by Product Line [Line Items]
Percentage of sales	5.50%	5.70%
Janitorial supplies
Percentage of Sales by Product Line [Line Items]
Percentage of sales	8.50%	8.30%
Electrical supplies
Percentage of Sales by Product Line [Line Items]
Percentage of sales	4.30%	4.60%
Welding supplies
Percentage of Sales by Product Line [Line Items]
Percentage of sales	3.80%	4.10%
Safety Supplies
Percentage of Sales by Product Line [Line Items]
Percentage of sales	21.50%	19.80%
Other
Percentage of Sales by Product Line [Line Items]
Percentage of sales	4.00%	3.20%

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