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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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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 | %

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