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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Earnings Per Share [Abstract]        
Net income (loss) attributable to WESCO International, Inc. $ (31,611) $ 63,503 $ 54,243 $ 162,273
Weighted average common shares outstanding used in computing basic earnings per share (in shares) 43,378 43,191 42,611 43,860
Common shares issuable upon exercise of dilutive stock options (in shares) 511 538 519 717
Common shares issuable from contingently convertible debentures (in shares) 4,851 5,989 4,908 6,738
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share (in shares) 48,740 49,718 48,038 51,315
Earnings Per Share, Basic and Diluted [Abstract]        
Basic (in dollars per share) $ (0.73) $ 1.47 $ 1.27 $ 3.70
Diluted (in dollars per share) $ (0.73) $ 1.28 $ 1.13 $ 3.16