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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				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income (loss) attributable to WESCO International, Inc.	$ 63,464	$ 42,369	$ 57,940	$ 44,421	$ 105,832	$ 102,361
Weighted average common shares outstanding used in computing basic earnings per share (in shares)	43,493		47,085		44,280	47,062
Common shares issuable upon exercise of dilutive stock options (in shares)	323		465		381	516
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share (in shares)	43,816		47,550		44,661	47,578
Earnings Per Share, Basic and Diluted [Abstract]
Basic (in dollars per share)	$ 1.46		$ 1.23		$ 2.39	$ 2.18
Diluted (in dollars per share)	$ 1.45		$ 1.22		$ 2.37	$ 2.15

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