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SUBSEQUENT EVENTS	9 Months Ended
SUBSEQUENT EVENTS	Sep. 30, 2012
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS On October 15, 2012, WESCO entered into a definitive agreement to acquire EECOL Electric Corporation, headquartered in Calgary, Alberta, Canada, and various affiliated companies for a purchase price of approximately CAD$1.14 billion. EECOL Electric is one of Canada's premier full-line distributors of electrical equipment, products and services with approximately $0.9 billion in annual sales, 57 locations across Canada and 20 in South America, and more than 20,000 customers. Consummation of the transaction is subject to certain conditions, including approval under the Canadian Competition Act. The acquisition is expected to be financed utilizing a new institutional term loan to be entered into on or before closing, as well as WESCO's existing credit facilities. Closing is expected to occur during the fourth quarter of 2012.