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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accelerated Share Repurchases [Line Items]                      
Payments for Repurchase of Common Stock                 $ 4,818 $ 155,805 $ 7,222
Stock Repurchase Program, Authorized Amount $ 300,000               300,000    
Net Income $ 47,348 $ (31,611) $ 49,798 $ 36,053 $ 48,412 $ 63,503 $ 51,741 $ 47,031 $ 101,588 $ 210,687 $ 275,906
Weighted average common shares outstanding used in computing basic earnings per share                 44,116 43,433 44,440
Common shares issuable upon exercise of dilutive stock options                 543 626 997
Common shares issuable from contingently convertible debentures                 3,674 6,314 7,821
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share                 48,333 50,373 53,258
Earnings Per Share attributable to WESCO International, Inc.                      
Basic $ 0.97 $ (0.73) $ 1.18 $ 0.85 $ 1.15 $ 1.47 $ 1.18 $ 1.06 $ 2.30 $ 4.85 $ 6.21
Diluted $ 0.96 $ (0.73) $ 1.02 $ 0.77 $ 1.03 $ 1.28 $ 1.00 $ 0.90 $ 2.10 $ 4.18 $ 5.18
Repurchase Agreements [Member]                      
Accelerated Share Repurchases [Line Items]                      
Payments for Repurchase of Common Stock                 $ 150,000