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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, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net income (loss) attributable to WESCO International, Inc.	$ 34,407	$ 42,369
Weighted average common shares outstanding used in computing basic earnings per share (in shares)	41,837	45,076
Common shares issuable upon exercise of dilutive stock options (in shares)	238	415
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share (in shares)	42,075	45,491
Earnings Per Share, Basic and Diluted [Abstract]
Basic (in dollars per share)	$ 0.82	$ 0.94
Diluted (in dollars per share)	$ 0.82	$ 0.93

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