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ORGANIZATION (Details) | Mar. 31, 2018 customers countries branches
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Restructuring Cost and Reserve [Line Items] |
Active customers (in customers) | customers | 70,000
Full service branches (in branches) | branches | 500
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
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RestructuringCostAndReserveLineItems
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