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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, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income (loss) attributable to WESCO International, Inc.	$ 64,495	$ 63,464	$ 42,369	$ 66,849	$ 57,940	$ 44,421	$ 170,329	$ 169,210
Weighted average common shares outstanding used in computing basic earnings per share (in shares)	42,100			47,010			43,545	47,044
Common shares issuable upon exercise of dilutive stock options (in shares)	278			476			355	503
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share (in shares)	42,378			47,486			43,900	47,547
Earnings Per Share, Basic and Diluted [Abstract]
Basic (in dollars per share)	$ 1.53			$ 1.42			$ 3.91	$ 3.60
Diluted (in dollars per share)	$ 1.52			$ 1.41			$ 3.88	$ 3.56

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