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EARNINGS PER SHARE (Tables)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table sets forth the details of basic and diluted earnings per share:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
(In thousands, except per share data)
2017
 
2016
 
2017
 
2016
Net income (loss) attributable to WESCO International, Inc.
$
53,675

 
$
(31,611
)
 
$
140,918

 
$
54,243

Weighted-average common shares outstanding used in computing basic earnings per share
47,415

 
43,378

 
48,134

 
42,611

Common shares issuable upon exercise of dilutive equity awards
389

 
511

 
508

 
519

Common shares issuable from contingently convertible debentures (see below for basis of calculation)
—

 
4,851

 
—

 
4,908

Weighted-average common shares outstanding and common share equivalents, diluted
47,804

 
48,740

 
48,642

 
48,038

Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share

47,804

 
43,378

 
48,642

 
48,038

Earnings (loss) per share attributable to WESCO International, Inc.
 
 
 
 
 
 
 
Basic
$
1.13

 
$
(0.73
)
 
$
2.93

 
$
1.27

Diluted
$
1.12

 
$
(0.73
)
 
$
2.90

 
$
1.13