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SCHEDULE OF EARNINGS PER SHARE, BASIC AND DILUTED (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share [Abstract]                
Net income (loss) attributable to WESCO International, Inc. $ 80,678 $ (34,506) $ 34,407 $ 64,495 $ 63,464 $ 42,369 $ 80,578 $ 170,329
Weighted average common shares outstanding used in computing basic earnings per share (in shares) 50,043,000     42,100,000     44,873,000 43,545,000
Common shares issuable upon exercise of dilutive stock options (in shares) 444,000     278,000     231,000 355,000
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share (in shares) 50,487,000     42,378,000     45,104,000 43,900,000
Earnings Per Share, Basic and Diluted [Abstract]                
Basic (in dollars per share) $ 1.32     $ 1.53     $ 1.44 $ 3.91
Diluted (in dollars per share) $ 1.31     $ 1.52     $ 1.44 $ 3.88
Net Income (Loss) Available to Common Stockholders, Basic $ 66,167     $ 64,495     $ 64,791 $ 170,329