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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, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]                
Net income (loss) attributable to WESCO International, Inc. $ 119,596 $ 119,195 $ 59,178 $ 80,678 $ (34,506) $ 34,407 $ 297,969 $ 80,578
Weighted average common shares outstanding used in computing basic earnings per share (in shares) 50,386,000     50,043,000     50,252,000 44,873,000
Common shares issuable upon exercise of dilutive stock options (in shares) 1,677,000     444,000     1,644,000 231,000
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share (in shares) 52,063,000     50,487,000     51,896,000 45,104,000
Earnings Per Share, Basic and Diluted [Abstract]                
Basic (in dollars per share) $ 2.09     $ 1.32     $ 5.07 $ 1.44
Diluted (in dollars per share) $ 2.02     $ 1.31     $ 4.91 $ 1.44
Net Income (Loss) Available to Common Stockholders, Basic $ 105,244     $ 66,167     $ 254,913 $ 64,791
Preferred Stock Dividends, Income Statement Impact $ 14,352     $ 14,511     $ 43,056 $ 15,787