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v3.19.3.a.u2

ORGANIZATION (Details) | 12 Months Ended
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Dec. 31, 2019 distribution_centers customers countries branches
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Customers (in customers) | customers | 70,000
Full service branches (in branches) | branches | 500
Distribution Centers | distribution_centers | 11
Additional countries (in countries) | countries | 16

X
- Definition The number of countries in which the entity operates as of balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfCountriesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of stores. + References No definition available. + Details
Name: | us-gaap_NumberOfStores
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of customers actively served by the Company. + References No definition available. + Details
Name: | wcc_CustomerCount
Namespace Prefix: | wcc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Distribution Centers + References No definition available. + Details
Name: | wcc_DistributionCenters
Namespace Prefix: | wcc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration