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STOCK-BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
During the three and six months ended June 30, 2017 and 2016, WESCO granted the following stock-settled stock appreciation rights, restricted stock units and performance-based awards at the following weighted-average fair values:
 
Three Months Ended
 
Six Months Ended
 
June 30,
2017
 
June 30,
2016
 
June 30,
2017
 
June 30,
2016
Stock-settled stock appreciation rights granted
—

 
4,744

 
443,731

 
708,254

Weighted-average fair value
$
—

 
$
17.22

 
$
20.65

 
$
12.90

 
 
 
 
 
 
 
 
Restricted stock units granted
—

 
137

 
98,680

 
143,305

Weighted-average fair value
$
—

 
$
54.67

 
$
71.65

 
$
42.45

 
 
 
 
 
 
 
 
Performance-based awards granted
—

 
—

 
39,978

 
91,768

Weighted-average fair value
$
—

 
$
—

 
$
76.63

 
$
47.00
Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity [Table Text Block]
The following table sets forth a summary of stock-settled stock appreciation rights and related information for the six months ended June 30, 2017:
 
Awards
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual Term (In years)
 
Aggregate
Intrinsic
Value
(In thousands)
Outstanding at December 31, 2016
2,439,487

 
$
52.62

 
 
 
 
     Granted
443,731

 
71.65

 
 
 
 
     Exercised
(468,600
)
 
42.48

 
 
 
 
     Forfeited
(87,445
)
 
68.93

 
 
 
 
Outstanding at June 30, 2017
2,327,173

 
57.68

 
6.6
 
$
17,651

Exercisable at June 30, 2017
1,398,502

 
$
56.84

 
5.0
 
$
11,783
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
The following table sets forth a summary of time-based restricted stock units and related information for the six months ended June 30, 2017:
 
Awards
 
Weighted-
Average
Fair
Value
Unvested at December 31, 2016
257,096

 
$
57.47

     Granted
98,680

 
71.65

     Vested
(43,169
)
 
85.17

     Forfeited
(12,449
)
 
53.91

Unvested at June 30, 2017
300,158

 
$
58.29
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
The following table sets forth a summary of performance-based awards for the six months ended June 30, 2017:
 
Awards
 
Weighted-
Average
Fair
Value
Unvested at December 31, 2016
149,320

 
$
60.36

     Granted
39,978

 
76.63

     Vested
—

 
—

     Forfeited
(36,162
)
 
79.64

Unvested at June 30, 2017
153,136

 
$
60.05
Stock Appreciation Rights (SARs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The fair value of stock-settled stock appreciation rights was estimated using the following weighted-average assumptions:
 
Three Months Ended
 
Six Months Ended
 
June 30,
2017
 
June 30,
2016
 
June 30,
2017
 
June 30,
2016
Risk free interest rate
—
%
 
1.2
%
 
1.9
%
 
1.2
%
Expected life (in years)
0

 
5

 
5

 
5

Expected volatility
—
%
 
32
%
 
29
%
 
32
%
Performance Shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The fair value of the performance shares granted during the six months ended June 30, 2017 and 2016 was estimated using the following weighted-average assumptions:
 
Six Months Ended
 
June 30,
2017
 
June 30,
2016
Grant date share price
$
71.65

 
$
42.44

WESCO expected volatility
29
%
 
26
%
Peer group median volatility
24
%
 
24
%
Risk-free interest rate
1.5
%
 
0.9
%
Correlation of peer company returns
114
%
 
122
%