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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, 2017
Mar. 31, 2016
Earnings Per Share [Abstract]    
Net income (loss) attributable to WESCO International, Inc. $ 37,729 $ 36,053
Weighted average common shares outstanding used in computing basic earnings per share (in shares) 48,707 42,210
Common shares issuable upon exercise of dilutive stock options (in shares) 694 414
Common shares issuable from contingently convertible debentures (in shares) 0 4,189
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share (in shares) 49,401 46,813
Earnings Per Share, Basic and Diluted [Abstract]    
Basic (in dollars per share) $ 0.77 $ 0.85
Diluted (in dollars per share) $ 0.76 $ 0.77