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Compensation Related Costs, Postemployment Benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Defined Contribution Plan Disclosure [Line Items]      
Service cost $ 2,155 $ 3,988  
Interest cost 4,394 4,583  
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 7,774 8,757  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 185 (102)  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) (1,410) (84)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Defined Benefit Plan, Plan Assets, Contributions by Employer 3,200    
Increase (Decrease) in Other Operating Assets 34,181 (17,140)  
WESCODeferredCompensationPlanMember      
Defined Contribution Plan Disclosure [Line Items]      
Deferred Compensation Liability, Classified, Noncurrent 20,900   $ 20,900
Pension Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Other Nonoperating Gains (Losses) (3,600) (4,100)  
UNITED STATES      
Defined Contribution Plan Disclosure [Line Items]      
Service cost 0 764  
Interest cost 2,083 2,137  
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 3,497 4,501  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 0 0  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) (1,414) (1,600)  
Foreign Plan      
Defined Contribution Plan Disclosure [Line Items]      
Service cost 2,155 3,224  
Interest cost 2,311 2,446  
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 4,277 4,256  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 185 (102)  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ 4 1,516  
U.S. Defined Contribution Plan Merger | Defined Benefit Contribution Plan Initial Percent Of Employer Match Member      
Defined Contribution Plan Disclosure [Line Items]      
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 100.00%    
Defined Contribution Plan Employer Matching Contribution Percent 3.00%    
U.S. Defined Contribution Plan Merger | Defined Benefit Contribution Plan Additional Percent Of Employer Match      
Defined Contribution Plan Disclosure [Line Items]      
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 50.00%    
Defined Contribution Plan Employer Matching Contribution Percent 4.00%    
Wesco Canadian Defined Contribution Plan      
Defined Contribution Plan Disclosure [Line Items]      
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 5.00%    
Wesco Canadian Defined Contribution Plan | Defined Benefit Contribution Plan Initial Percent Of Employer Match Member      
Defined Contribution Plan Disclosure [Line Items]      
Defined Contribution Plan Employer Matching Contribution Percent 3.00%    
Wesco Canadian Defined Contribution Plan | Defined Benefit Contribution Plan Additional Percent Of Employer Match      
Defined Contribution Plan Disclosure [Line Items]      
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 50.00%    
Defined Contribution Plan Employer Matching Contribution Percent 4.00%    
Phantom Share Units (PSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Share-based Payment Arrangement, Expense $ 200 $ 5,700  
Other Deferred Compensation Arrangements, Liability, Classified, Noncurrent $ 11,300   $ 22,700