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Operating Segments and Geographic Information - Additional Information (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) Segment | Dec. 31, 2017 USD ($) Reporting_Unit | Dec. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |
Number of reportable segments | 4 | 5 |  |  |  |
Anixter International Inc. [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues generated from sales |  |  | $ 292.2 |  | $ 286.2 | $ 281.9
Accounts receivable outstanding | $ 38.2 | $ 38.2 | $ 38.2 | $ 38.2 |  |
Anixter International Inc. [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Percentage of total accounts receivable outstanding | 8.00% | 8.00% | 8.00% | 8.00% |  |
Anixter International Inc. [Member] | Customer Concentration Risk [Member] | Revenues [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Percent of total revenues |  |  |  | 12.00% | 12.00% | 12.00%

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