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EARNINGS PER SHARE (Tables)
 9 Months Ended
Sep. 30, 2016
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)
2016
 
2015
 
2016
 
2015
Net (loss) income 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
43,378

 
43,191

 
42,611

 
43,860

Common shares issuable upon exercise of dilutive equity awards
511

 
538

 
519

 
717

Common shares issuable from contingently convertible debentures (see below for basis of calculation)
4,851

 
5,989

 
4,908

 
6,738

Weighted-average common shares outstanding and common share equivalents, diluted
48,740

 
49,718

 
48,038

 
51,315

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

43,378

 
49,718

 
48,038

 
51,315

(Loss) earnings per share attributable to WESCO International, Inc.
 
 

 
 
 
 
Basic
$
(0.73
)
 
$
1.47

 
$
1.27

 
$
3.70

Diluted
$
(0.73
)
 
$
1.28

 
$
1.13

 
$
3.16