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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity
The following table sets forth a summary of stock-settled stock appreciation rights and related information for the periods presented:
 
Year Ended December 31,
 
2019
 
2018
 
2017
 
Awards
 
Weighted-Average
Exercise
Price
 
Weighted-Average
Remaining
Contractual
Life
 
Aggregate
Intrinsic
Value
(In thousands)
 
Awards
 
Weighted-Average
Exercise
Price
 
Awards
 
Weighted-Average
Exercise
Price
Beginning of year
2,351,633

 
$
59.26

 
 
 
 
 
2,238,607

 
$
57.75

 
2,439,487

 
$
52.62

Granted
213,618

 
54.63

 
 
 
 
 
509,046

 
62.68

 
455,807

 
71.21

Exercised
(113,099
)
 
35.01

 
 
 
 
 
(192,700
)
 
40.74

 
(495,181
)
 
42.19

Canceled
(115,103
)
 
65.27

 
 
 
 
 
(203,320
)
 
68.69

 
(161,506
)
 
66.06

End of year
2,337,049

 
59.72

 
5.6
 
$
13,039

 
2,351,633

 
59.26

 
2,238,607

 
57.75

Exercisable at end of year
1,723,370

 
$
59.00

 
4.7
 
$
12,053

 
1,453,932

 
$
57.93

 
1,331,580

 
$
56.96
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The following table sets forth the weighted-average assumptions used to estimate the fair value of stock-settled stock appreciation rights granted during the periods presented:
 
Year Ended December 31,
 
2019
 
2018
 
2017
Stock-settled stock appreciation rights granted
213,618
 
509,046
 
455,807
   Risk free interest rate
2.5%
 
2.5%
 
1.9%
   Expected life (in years)
5
 
5
 
5
   Expected volatility
29%
 
28%
 
29%
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
The following table sets forth a summary of performance-based awards and related information for the periods presented:
 
Year Ended December 31,
 
2019
 
2018
 
2017
 
Awards
 
Weighted-Average
Fair
Value
 
Awards
 
Weighted-Average
Fair
Value
 
Awards
 
Weighted-Average
Fair
Value
Unvested at beginning of year
138,896

 
$
59.33

 
148,508

 
$
60.23

 
149,320

 
$
60.36

     Granted
126,874

 
54.64

 
44,144

 
62.80

 
39,978

 
76.63

     Vested
(25,696
)
 
42.44

 
—

 
—

 
—

 
—

     Forfeited
(44,769
)
 
52.11

 
(53,756
)
 
64.67

 
(40,790
)
 
76.77

Unvested at end of year
195,305

 
$
60.24

 
138,896

 
$
59.33

 
148,508

 
$
60.23


The following table sets forth a summary of time-based restricted stock units and related information for the periods presented:
 
Year Ended December 31,
 
2019
 
2018
 
2017
 
Awards
 
Weighted-Average
Fair
Value
 
Awards
 
Weighted-Average
Fair
Value
 
Awards
 
Weighted-Average
Fair
Value
Unvested at beginning of year
327,798

 
$
57.87

 
290,054

 
$
58.11

 
257,096

 
$
57.47

Granted
192,106

 
54.13

 
122,062

 
62.40

 
100,993

 
71.33

Vested
(136,777
)
 
46.52

 
(64,166
)
 
67.91

 
(44,720
)
 
84.57

Forfeited
(19,398
)
 
59.62

 
(20,152
)
 
58.15

 
(23,315
)
 
57.52

Unvested at end of year
363,729

 
$
60.00

 
327,798

 
$
57.87

 
290,054

 
$
58.11
Schedule of Share-based Payment Award, Performance-based Awards, Valuation Assumptions [Table Text Block]
The following table sets forth the assumptions used to estimate the fair value of performance shares granted during the periods presented:
 
Year ended December 31,
 
2019
 
2018
 
2017
Grant date share price
$
54.64

 
$
62.80

 
$
71.67

WESCO expected volatility
n/a

 
n/a

 
29
%
Peer group median volatility
n/a

 
n/a

 
24
%
Risk-free interest rate
n/a

 
n/a

 
1.5
%
Correlation of peer company returns
n/a

 
n/a

 
114
%