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EARNINGS PER SHARE - SCHEDULE OF EARNINGS PER SHARE, BASIC AND DILUTED (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accelerated Share Repurchases [Line Items]                      
Payments for Repurchase of Common Stock                 $ 106,792 $ 4,818 $ 155,805
Stock Repurchase Program, Authorized Amount $ 300,000               300,000    
Net Income $ 22,546 $ 53,675 $ 49,510 $ 37,729 $ 47,348 $ (31,611) $ 49,798 $ 36,053 $ 163,460 $ 101,588 $ 210,687
Weighted average common shares outstanding used in computing basic earnings per share                 47,849 44,116 43,433
Common shares issuable upon exercise of dilutive stock options                 512 543 626
Common shares issuable from contingently convertible debentures                 0 3,674 6,314
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share                 48,361 48,333 50,373
Earnings Per Share attributable to WESCO International, Inc.                      
Basic $ 0.48 $ 1.13 $ 1.03 $ 0.77 $ 0.97 $ (0.73) $ 1.18 $ 0.85 $ 3.42 $ 2.30 $ 4.85
Diluted $ 0.47 $ 1.12 $ 1.02 $ 0.76 $ 0.96 $ (0.73) $ 1.02 $ 0.77 $ 3.38 $ 2.10 $ 4.18
Treasury Stock, Common [Member]                      
Accelerated Share Repurchases [Line Items]                      
Payments for Repurchase of Common Stock                 $ 100,000   $ 150,000