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SEGMENTS AND RELATED INFORMATION - SEGMENTS AND RELATED INFORMATION (Details) | Dec. 31, 2018 stockkeepingunits products
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Segment Reporting [Abstract] |
Product stock keeping units (in stock keeping units) | stockkeepingunits | 220,000
Products (in products) | products | 1,000,000

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

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- Definition Product Stock Keeping Units + References No definition available. + Details
Name: | wcc_ProductStockKeepingUnits
Namespace Prefix: | wcc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Products + References No definition available. + Details
Name: | wcc_Products
Namespace Prefix: | wcc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant