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BUSINESS SEGMENTS (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) Employees segment countries | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Segment Reporting [Abstract] |  |  |  |  |  |
Net sales | [1] | $ 18,217,512 |  | $ 12,325,995 |  | $ 8,358,917
Operating Income (Loss) |  | 801,873 |  | 347,038 |  | 346,217
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales | [1] | 18,217,512 |  | 12,325,995 |  | 8,358,917
Operating Income (Loss) |  | 801,873 |  | 347,038 |  | 346,217
Adjusted EBITDA |  | $ 1,175,683 |  | $ 660,317 |  | $ 430,516
Adjusted EBITDA Margin Percentage |  | 6.50% |  | 5.40% |  | 5.20%
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment |  | $ 36,600 |  |  |  |
Depreciation and amortization |  | 198,554 |  | $ 121,600 |  | $ 62,107
Other, net |  | (48,112) |  | (2,395) |  | (1,554)
Stock-based compensation expense (EBITDA) |  | 25,699 | [2] | 16,714 | [3] | 19,062
Stock-based compensation expense |  | 30,821 |  | 19,279 |  | 19,062
Business Combination, Integration Related Costs |  | 158,484 |  | 132,236 |  | 3,130
Merger-related Inventory Fair Value Adjustments |  |  |  | 43,693 |  |
Segment Reporting Information Out-of-period Adjustment |  |  |  | 18,852 |  |
Gain (Loss) on Disposition of Assets |  |  |  | (19,816) |  |
Gain (Loss) on Disposition of Business |  | (8,927) |  | (19,816) |  | 0
Payments for (Proceeds from) Productive Assets |  | 54,746 |  | 56,671 |  | 44,067
Net Income (Loss) Available to Common Stockholders, Basic |  | 407,974 |  | 70,421 |  | 223,426
Net loss attributable to noncontrolling interest |  | 1,020 |  | (521) |  | (1,228)
Preferred Stock Dividends, Income Statement Impact |  | 57,408 |  | 30,139 |  | 0
Income Tax Expense (Benefit) |  | 115,510 |  | 22,803 |  | 59,863
Interest expense, net |  | 268,073 |  | 226,591 |  | 65,710
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |
Assets |  | $ 12,617,699 |  | 11,880,214 |  |
Number of Reportable Segments | segment |  | 3 |  |  |  |
EES |  |  |  |  |  |
Segment Reporting [Abstract] |  |  |  |  |  |
Net sales |  | $ 7,621,263 |  | 5,479,760 |  | 4,860,541
Operating Income (Loss) |  | 542,059 |  | 260,207 |  | 261,788
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | 7,621,263 |  | 5,479,760 |  | 4,860,541
Operating Income (Loss) |  | 542,059 |  | 260,207 |  | 261,788
Adjusted EBITDA |  | $ 604,461 |  | $ 308,327 |  | $ 291,473
Adjusted EBITDA Margin Percentage |  | 7.90% |  | 5.60% |  | 6.00%
Depreciation and amortization |  | $ 55,998 |  | $ 35,811 |  | $ 28,569
Other, net |  | 1,872 |  | 1,780 |  | 1,554
Stock-based compensation expense (EBITDA) |  | 6,404 |  | 4,080 | [4] | 1,116
Business Combination, Integration Related Costs |  | 0 |  | 0 |  | 0
Merger-related Inventory Fair Value Adjustments |  |  |  | 15,411 |  |
Segment Reporting Information Out-of-period Adjustment |  |  |  | 12,634 |  |
Gain (Loss) on Disposition of Assets |  |  |  | (19,816) |  |
Gain (Loss) on Disposition of Business |  | 0 |  |  |  |
Payments for (Proceeds from) Productive Assets |  | 4,469 |  | 7,081 |  | 20,405
Net Income (Loss) Available to Common Stockholders, Basic |  | 543,633 |  | 262,829 |  | 264,570
Net loss attributable to noncontrolling interest |  | 298 |  | (842) |  | (1,228)
Preferred Stock Dividends, Income Statement Impact |  | 0 |  | 0 |  |
Income Tax Expense (Benefit) |  | $ 0 |  | 0 |  | 0
Entity Number of Employees | Employees |  | 6,400 |  |  |  |
Additional countries (in countries) | countries |  | 50 |  |  |  |
Interest expense, net |  | $ 0 |  | 0 |  | 0
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |
Assets |  | 4,098,335 |  | 3,726,855 |  |
CSS |  |  |  |  |  |
Segment Reporting [Abstract] |  |  |  |  |  |
Net sales |  | 5,715,238 |  | 3,323,264 |  | 909,496
Operating Income (Loss) |  | 395,343 |  | 217,163 |  | 43,835
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | 5,715,238 |  | 3,323,264 |  | 909,496
Operating Income (Loss) |  | 395,343 |  | 217,163 |  | 43,835
Adjusted EBITDA |  | $ 480,820 |  | $ 280,656 |  | $ 51,067
Adjusted EBITDA Margin Percentage |  | 8.40% |  | 8.40% |  | 5.60%
Depreciation and amortization |  | $ 82,870 |  | $ 37,765 |  | $ 7,155
Other, net |  | (1,312) |  | 48 |  | 0
Stock-based compensation expense (EBITDA) |  | 2,607 |  | 1,403 | [4] | 77
Business Combination, Integration Related Costs |  | 0 |  | 0 |  | 0
Merger-related Inventory Fair Value Adjustments |  |  |  | 22,000 |  |
Segment Reporting Information Out-of-period Adjustment |  |  |  | 2,325 |  |
Gain (Loss) on Disposition of Assets |  |  |  | 0 |  |
Gain (Loss) on Disposition of Business |  | 0 |  |  |  |
Payments for (Proceeds from) Productive Assets |  | 3,197 |  | 1,495 |  | 3,093
Net Income (Loss) Available to Common Stockholders, Basic |  | 394,031 |  | 217,211 |  | 43,835
Net loss attributable to noncontrolling interest |  | 0 |  | 0 |  | 0
Preferred Stock Dividends, Income Statement Impact |  | 0 |  | 0 |  |
Income Tax Expense (Benefit) |  | $ 0 |  | 0 |  | 0
Entity Number of Employees | Employees |  | 3,300 |  |  |  |
Additional countries (in countries) | countries |  | 50 |  |  |  |
Interest expense, net |  | $ 0 |  | 0 |  | 0
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |
Assets |  | 4,601,132 |  | 4,275,611 |  |
UBS |  |  |  |  |  |
Segment Reporting [Abstract] |  |  |  |  |  |
Net sales |  | 4,881,011 |  | 3,522,971 |  | 2,588,880
Operating Income (Loss) |  | 412,740 |  | 231,702 |  | 184,931
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | 4,881,011 |  | 3,522,971 |  | 2,588,880
Operating Income (Loss) |  | 412,740 |  | 231,702 |  | 184,931
Adjusted EBITDA |  | $ 428,367 |  | $ 265,593 |  | $ 198,745
Adjusted EBITDA Margin Percentage |  | 8.80% |  | 7.50% |  | 7.70%
Depreciation and amortization |  | $ 22,447 |  | $ 22,380 |  | $ 13,583
Other, net |  | (42) |  | (24) |  | 0
Stock-based compensation expense (EBITDA) |  | 2,107 |  | 1,336 | [4] | 231
Business Combination, Integration Related Costs |  | 0 |  | 0 |  | 0
Merger-related Inventory Fair Value Adjustments |  |  |  | 6,282 |  |
Segment Reporting Information Out-of-period Adjustment |  |  |  | 3,893 |  |
Gain (Loss) on Disposition of Assets |  |  |  | 0 |  |
Gain (Loss) on Disposition of Business |  | 8,927 |  |  |  |
Payments for (Proceeds from) Productive Assets |  | 5,207 |  | 12,834 |  | 6,460
Net Income (Loss) Available to Common Stockholders, Basic |  | 412,698 |  | 231,678 |  | 184,931
Net loss attributable to noncontrolling interest |  | 0 |  | 0 |  | 0
Preferred Stock Dividends, Income Statement Impact |  | 0 |  | 0 |  |
Income Tax Expense (Benefit) |  | $ 0 |  | 0 |  | 0
Entity Number of Employees | Employees |  | 2,400 |  |  |  |
Interest expense, net |  | $ 0 |  | 0 |  | 0
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |
Assets |  | 3,266,231 |  | 2,947,406 |  |
Corporate Segment |  |  |  |  |  |
Segment Reporting [Abstract] |  |  |  |  |  |
Net sales |  | 0 |  | 0 |  | 0
Operating Income (Loss) |  | (548,269) |  | (362,034) |  | (144,337)
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | 0 |  | 0 |  | 0
Operating Income (Loss) |  | (548,269) |  | (362,034) |  | (144,337)
Adjusted EBITDA |  | (337,965) |  | (194,259) |  | (110,769)
Merger-related Stock-based compensation expense |  | (5,100) |  | (2,600) |  |
Depreciation and amortization |  | 37,239 |  | 25,644 |  | 12,800
Other, net |  | 47,594 | [5] | 591 |  | 0
Stock-based compensation expense (EBITDA) |  | 14,581 |  | 9,895 | [4] | 17,638
Business Combination, Integration Related Costs |  | 158,484 |  | 132,236 |  | 3,130
Merger-related Inventory Fair Value Adjustments |  |  |  | 0 |  |
Segment Reporting Information Out-of-period Adjustment |  |  |  | 0 |  |
Gain (Loss) on Disposition of Assets |  |  |  | 0 |  |
Gain (Loss) on Disposition of Business |  | 0 |  |  |  |
Payments for (Proceeds from) Productive Assets |  | 41,873 |  | 35,261 |  | 14,109
Net Income (Loss) Available to Common Stockholders, Basic |  | (942,388) |  | (641,297) |  | (269,910)
Net loss attributable to noncontrolling interest |  | 722 |  | 321 |  | 0
Preferred Stock Dividends, Income Statement Impact |  | 57,408 |  | 30,139 |  |
Income Tax Expense (Benefit) |  | 115,510 |  | 22,803 |  | 59,863
Interest expense, net |  | (268,073) |  | (226,591) |  | $ (65,710)
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |
Assets | [6] | $ 652,001 |  | $ 930,342 |  |
[1] | (2) Wesco attributes revenues from external customers to individual countries on the basis of point of sale.
[2] | (2) Stock-based compensation expense in the calculation of adjusted EBITDA for the year ended December 31, 2021 excludes $5.1 million as such amount is included in merger-related and integration costs.
[3] | (4) Stock-based compensation expense in the calculation of adjusted EBITDA for the year ended December 31, 2020 excludes $2.6 million as such amount is included in merger-related and integration costs.
[4] | (3) Stock-based compensation and the out-of-period adjustment by reportable segment for the year ended December 31, 2020, as previously reported in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2020, have been reallocated to conform to the current period's presentation.
[5] | (1) Corporate other non-operating income in the calculation of adjusted EBITDA for the year ended December 31, 2021 includes a $36.6 million curtailment gain resulting from the remeasurement of the Company's pension obligations in the U.S. and Canada due to amending certain terms of such defined benefit plans.
[6] | Total assets for Corporate primarily consist of cash and cash equivalents, deferred income taxes, fixed assets and right-of-use assets associated with operating leases.

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