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SCHEDULE OF PRO FORMA INFORMATION (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Anixter International |  |
Business Acquisition [Line Items] |  |
Pro forma net sales |  | $ 4,040,347
Pro forma net income attributable to common stockholders |  | 19,880
Business Combination, Acquisition Related Costs | $ 46,300 | $ 4,600
Anixter International acquisition [Member] |  |
Business Acquisition [Line Items] |  |
Business Acquisition, Pro Forma Information, Description | The following unaudited pro forma financial information presents combined results of operations for the period presented, as if the Company had completed the Merger on January 1, 2019. The unaudited pro forma financial information includes adjustments to amortization and depreciation for intangible assets and property, buildings and equipment, adjustments to interest expense for the additional indebtedness incurred to complete the acquisition (including the amortization of debt discount and issuance costs), transaction costs, dividends accrued on the Series A preferred stock, compensation expense associated with the WESCO phantom stock unit awards described in Note 9, "Employee Benefit Plans", as well as the respective income tax effects of such adjustments. For the three months ended March 31, 2020, adjustments totaling $50.2 million decreased the unaudited pro forma net income attributable to common stockholders. The unaudited pro forma financial information does not reflect any cost savings, operating synergies or revenue enhancements that WESCO may achieve as a result of its acquisition of Anixter, the costs to integrate the operations of WESCO and Anixter or the costs necessary to achieve these cost savings, operating synergies and revenue enhancements. The unaudited pro forma financial information presented below is not necessarily indicative of consolidated results of operations of the combined business had the acquisition occurred at the beginning of the respective period, nor is it necessarily indicative of future results of operations of the combined company. |

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