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Operating Segments and Geographic Information - Additional Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Segment
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting Information [Line Items]            
Number of reportable segments 2   2      
Revenues   $ 1,862,716     $ 2,131,278 $ 2,165,702
Anixter International Inc.            
Segment Reporting Information [Line Items]            
Accounts receivable outstanding $ 17,500 $ 17,500 $ 17,500 $ 17,500    
Anixter International Inc. | Customer Concentration Risk            
Segment Reporting Information [Line Items]            
Percentage of total accounts receivable outstanding 6.00% 6.00% 6.00% 6.00%    
Anixter International Inc and WESCO            
Segment Reporting Information [Line Items]            
Revenues   $ 271,600     $ 328,200 $ 361,700
Anixter International Inc and WESCO | Customer Concentration Risk | Revenues            
Segment Reporting Information [Line Items]            
Percent of total revenues       15.00% 15.00% 17.00%