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STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2018

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 nine months ended September 30, 2018 and 2017, 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								Nine Months Ended
	September 30, 2018				September 30, 2017				September 30, 2018				September 30, 2017
Stock-settled stock appreciation rights granted	9,415				12,076				509,046				455,807
Weighted-average fair value	$	17.40			$	15.74			$	18.38			$	20.52
Restricted stock units granted	2,686				2,313				119,457				100,993
Weighted-average fair value	$	61.41			$	57.30			$	62.72			$	71.33
Performance-based awards granted	—				—				44,144				39,978
Weighted-average fair value	$	—			$	—			$	62.80			$	76.63

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 nine months ended September 30, 2018:

	Awards			Weighted- Average Exercise Price				Weighted- Average Remaining Contractual Term (In years)		Aggregate Intrinsic Value (In thousands)
Outstanding at December 31, 2017	2,238,607			$	57.75
Granted	509,046			62.68
Exercised	(186,662	)		40.73
Forfeited	(168,824	)		69.12
Outstanding at September 30, 2018	2,392,167			59.32				6.3		$	16,779
Exercisable at September 30, 2018	1,476,763			$	58.03			4.9		$	13,566

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 nine months ended September 30, 2018:

	Awards			Weighted- Average Fair Value
Unvested at December 31, 2017	290,054			$	58.11
Granted	119,457			62.72
Vested	(59,905	)		68.78
Forfeited	(14,539	)		57.09
Unvested at September 30, 2018	335,067			$	57.89

Schedule of Nonvested Performance-based Units Activity [Table Text Block]

The following table sets forth a summary of performance-based awards for the nine months ended September 30, 2018:

	Awards			Weighted- Average Fair Value
Unvested at December 31, 2017	148,508			$	60.23
Granted	44,144			62.80
Vested	—			—
Forfeited	(52,342	)		65.15
Unvested at September 30, 2018	140,310			$	59.20

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						Nine Months Ended
	September 30, 2018			September 30, 2017			September 30, 2018			September 30, 2017
Risk free interest rate	2.8	%		1.8	%		2.5	%		1.9	%
Expected life (in years)	5			5			5			5
Expected volatility	28	%		28	%		28	%		29	%

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 nine months ended September 30, 2018 and 2017 was estimated using the following weighted-average assumptions:

	Nine Months Ended
	September 30, 2018				September 30, 2017
Grant date share price	$	62.80			$	71.65
WESCO expected volatility	n/a				29		%
Peer group median volatility	n/a				24		%
Risk-free interest rate	n/a				1.5		%
Correlation of peer company returns	n/a				114		%

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Tabular disclosure of the changes in outstanding nonvested performance-based units.

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