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Operating Segments and Geographic Information - Additional Information (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Sep. 29, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jul. 01, 2018
USD ($)
Apr. 01, 2018
USD ($)
Dec. 31, 2019
USD ($)
Segment
Dec. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
segment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Segment Reporting Information [Line Items]                            
Number of reportable segments                 2     2    
Revenues $ 549,688 $ 533,098 $ 548,352 $ 500,140 $ 552,052 $ 554,037 $ 560,898 $ 498,715   $ 2,131,278     $ 2,165,702 $ 2,087,185
Anixter International Inc.                            
Segment Reporting Information [Line Items]                            
Revenues                   285,000     $ 309,000 $ 292,200
Accounts receivable outstanding $ 10,200               $ 10,200 $ 10,200 $ 10,200 $ 10,200    
Anixter International Inc. | Customer Concentration Risk                            
Segment Reporting Information [Line Items]                            
Percentage of total accounts receivable outstanding 3.00%               3.00% 3.00% 3.00% 3.00%    
Anixter International Inc. | Customer Concentration Risk | Revenues                            
Segment Reporting Information [Line Items]                            
Percent of total revenues                     13.00%   14.00% 14.00%
Anixter International Inc and WESCO                            
Segment Reporting Information [Line Items]                            
Revenues                   $ 328,200     $ 361,700 $ 342,800
Anixter International Inc and WESCO | Customer Concentration Risk | Revenues                            
Segment Reporting Information [Line Items]                            
Percent of total revenues                     15.00%   17.00% 16.00%