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ORGANIZATION (Details)
Mar. 31, 2015
distribution_centers
countries
customers
Restructuring Cost and Reserve [Line Items]  
Active customers (in customers) 75,000wcc_CustomerCount
Full service branches (in branches) 9us-gaap_NumberOfStores
Additional countries (in countries) 16wcc_Additionalcountries
Hazmasters, Inc. [Member]  
Restructuring Cost and Reserve [Line Items]  
Full service branches (in branches) 14us-gaap_NumberOfStores
/ us-gaap_BusinessAcquisitionAxis
= wcc_HazmastersInc.Member