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EARNINGS PER SHARE - SCHEDULE OF EARNINGS PER SHARE, BASIC AND DILUTED (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended 36 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2014
Accelerated Share Repurchases [Line Items]                          
Payments for Repurchase of Common Stock                 $ 127,169 $ 106,792 $ 4,818    
Stock Repurchase Program, Authorized Amount $ 400,000       $ 300,000       $ 400,000 $ 300,000   $ 300,000 $ 300,000
Stock Repurchase Program Expiration Date                 Dec. 31, 2020 Dec. 31, 2017      
Treasury Stock, Shares, Acquired                 2,003,446 1,778,537      
Net Income $ 58,133 $ 66,849 $ 57,940 $ 44,421 $ 22,546 $ 53,675 $ 49,510 $ 37,729 $ 227,343 $ 163,460 $ 101,588    
Weighted average common shares outstanding used in computing basic earnings per share                 46,722,000 47,849,000 44,116,000    
Common shares issuable upon exercise of dilutive stock options                 477,000 512,000 543,000    
Common shares issuable from contingently convertible debentures                 0 0 3,674,000    
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share                 47,199,000 48,361,000 48,333,000    
Earnings Per Share attributable to WESCO International, Inc.                          
Basic $ 1.27 $ 1.42 $ 1.23 $ 0.94 $ 0.48 $ 1.13 $ 1.03 $ 0.77 $ 4.87 $ 3.42 $ 2.30    
Diluted $ 1.26 $ 1.41 $ 1.22 $ 0.93 $ 0.47 $ 1.12 $ 1.02 $ 0.76 $ 4.82 $ 3.38 $ 2.10    
Treasury Stock, Common [Member]                          
Accelerated Share Repurchases [Line Items]                          
Payments for Repurchase of Common Stock                 $ 125,000 $ 100,000   $ 250,000  
Treasury Stock, Common, Shares         4,247,113         4,247,113   4,247,113  
Treasury Stock, Shares, Acquired                 2,003,446 1,778,537