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SCHEDULE OF EARNINGS PER SHARE, BASIC AND DILUTED (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share [Abstract]    
Net income (loss) attributable to WESCO International, Inc. $ 59,178 $ 34,407
Weighted average common shares outstanding used in computing basic earnings per share (in shares) 50,124,000 41,837,000
Common shares issuable upon exercise of dilutive stock options (in shares) 1,584,000 238,000
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share (in shares) 51,708,000 42,075,000
Earnings Per Share, Basic and Diluted [Abstract]    
Basic (in dollars per share) $ 0.89 $ 0.82
Diluted (in dollars per share) $ 0.87 $ 0.82
Net Income (Loss) Available to Common Stockholders, Basic $ 44,826 $ 34,407