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INCOME TAXES - ADDITIONAL INFORMATION (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating Loss Carryforwards [Line Items] |  |  |  |
Amortization of intangible assets | $ 575,421 | $ 549,536 |  |
Deferred Tax Assets, Tax Deferred Expense, Other | 10,900 | 6,900 |  |
Deferred Tax Assets, Operating Loss Carryforwards | 31,956 | 39,876 |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | 52,195 | 51,632 |  |
Deferred Tax Assets, Valuation Allowance | 33,671 | 46,269 |  |
Unrecognized Tax Benefits | 109,268 | 107,291 | $ 68,075 | $ 54
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 40,600 | 36,100 | 29,100 |
Decrease in Unrecognized Tax Benefits is Reasonably Possible | 15,600 |  |  |
Interest related to uncertain tax positions | 2,300 | 900 | $ 300 |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | 9,600 | 6,400 |  |
Undistributed Earnings of Foreign Subsidiaries | 1,865,400 |  |  |
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries | 91,400 |  |  |
Unrecognized Tax Benefits, Income Tax Penalties Accrued | 4,800 | 4,900 |  |
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability | 58,800 |  |  |
Deferred Tax Asset, Interest Carryforward | $ 4,763 | 11,163 |  |
Unrecognized Tax Benefits, Income Tax Penalties Expense |  | 3,400 |  |
Income Tax Examination, Description | On October 22, 2021, one of the Company's Mexican affiliates received a tax assessment from the Mexican tax authorities in the amount of approximately $26.0 million related to its 2012 income tax return. This amount, updated for adjustments required under Mexican law, was approximately $29.8 million as of December 31, 2022. The Company believes the assessment is without merit and has filed an annulment lawsuit in the Mexican Federal Court of Administrative Justice. The Company expects to prevail in this litigation and, accordingly, has not recorded a reserve for this assessment in its consolidated financial statements.In July 2022, one of the Company's Canadian affiliates received tax assessments from the Canada Revenue Agency ("CRA") totaling approximately $11.0 million, including tax and interest, related to its 2012 through 2014 income tax returns. The Company believes these assessments are without merit and has filed objections with the Appeals Division of the CRA. The Company intends to avail itself of all available administrative and judicial remedies to overturn the assessments and expects to prevail. Therefore, the Company has not recorded a reserve for these assessments in its consolidated financial statements. The CRA continues to audit the 2015 and 2016 tax years of Wesco's Canadian affiliates and has made inquiries into their 2017 through 2019 income tax returns. The Company expects to eventually receive similar assessments for these tax years. |  |  |
General Business Tax Credit Carryforward [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred Tax Assets, Valuation Allowance | $ 6,100 | 17,300 |  |
State and Local Jurisdiction [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards | 4,400 |  |  |
Deferred Tax Asset, Interest Carryforward | 4,800 | 6,400 |  |
Domestic Tax Authority |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 6,500 |  |  |
Deferred Tax Asset, Interest Carryforward |  | 4,700 |  |
Foreign Tax Authority |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign | 27,600 | 35,500 |  |
Operating Loss Carryforwards, Valuation Allowance | 16,700 | 22,100 |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | $ 52,200 | $ 51,600 |  |

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