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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		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income (loss) attributable to WESCO International, Inc.	$ 53,675	$ (31,611)	$ 140,918	$ 54,243
Weighted average common shares outstanding used in computing basic earnings per share (in shares)	47,415	43,378	48,134	42,611
Common shares issuable upon exercise of dilutive stock options (in shares)	389	511	508	519
Common shares issuable from contingently convertible debentures (in shares)	0	4,851	0	4,908
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share (in shares)	47,804	48,740	48,642	48,038
Earnings Per Share, Basic and Diluted [Abstract]
Basic (in dollars per share)	$ 1.13	$ (0.73)	$ 2.93	$ 1.27
Diluted (in dollars per share)	$ 1.12	$ (0.73)	$ 2.90	$ 1.13

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