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v3.22.2.2

Compensation Related Costs, Postemployment Benefits (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Service cost | $ 2,047 | $ 4,015 | $ 6,318 | $ 12,082 |
Interest cost | 4,257 | 4,483 | 12,992 | 13,520 |
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | 7,514 | 8,691 | 22,959 | 26,139 |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 179 | (103) | 547 | (311) |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | (1,389) | (90) | (4,196) | (245) |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  |  | 9,300 |  |
WESCODeferredCompensationPlanMember |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Deferred Compensation Liability, Classified, Noncurrent | 19,600 |  | 19,600 |  | $ 20,900
Pension Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Other Nonoperating Gains (Losses) | (3,400) | (4,100) | (10,500) | (12,300) |
UNITED STATES |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Service cost | 0 | 764 | 0 | 2,291 |
Interest cost | 2,083 | 2,018 | 6,250 | 6,095 |
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | 3,497 | 4,414 | 10,491 | 13,241 |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 0 | 0 | 0 | 0 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | (1,414) | (1,632) | (4,241) | (4,874) |
Foreign Plan |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Service cost | 2,047 | 3,251 | 6,318 | 9,791 |
Interest cost | 2,174 | 2,465 | 6,742 | 7,425 |
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | 4,017 | 4,277 | 12,468 | 12,898 |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 179 | (103) | 547 | (311) |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 25 | 1,542 | $ 45 | 4,629 |
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 | 1,800 | $ 3,400 | $ 1,600 | $ 9,800 |
Other Deferred Compensation Arrangements, Liability, Classified, Noncurrent | $ 7,900 |  | $ 7,900 |  | $ 22,700

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