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SCHEDULE OF EARNINGS PER SHARE, BASIC AND DILUTED (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income (loss) attributable to WESCO International, Inc.	$ 44,421	$ 37,729
Weighted average common shares outstanding used in computing basic earnings per share (in shares)	47,038	48,707
Common shares issuable upon exercise of dilutive stock options (in shares)	570	694
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share (in shares)	47,608	49,401
Earnings Per Share, Basic and Diluted [Abstract]
Basic (in dollars per share)	$ 0.94	$ 0.77
Diluted (in dollars per share)	$ 0.93	$ 0.76

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