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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