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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

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