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STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 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 six months ended June 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								Six Months Ended
	June 30, 2018				June 30, 2017				June 30, 2018				June 30, 2017
Stock-settled stock appreciation rights granted	8,402				—				499,631				443,731
Weighted-average fair value	$	17.85			$	—			$	18.39			$	20.65
Restricted stock units granted	2,502				—				116,771				98,680
Weighted-average fair value	$	59.95			$	—			$	62.75			$	71.65
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 six months ended June 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	499,631			62.76
Exercised	(158,279	)		39.63
Forfeited	(135,511	)		68.78
Outstanding at June 30, 2018	2,444,448			59.33				6.6		$	13,624
Exercisable at June 30, 2018	1,523,126			$	58.09			5.2		$	11,130

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, 2018:

	Awards			Weighted- Average Fair Value
Unvested at December 31, 2017	290,054			$	58.11
Granted	116,771			62.75
Vested	(57,175	)		69.44
Forfeited	(10,710	)		56.45
Unvested at June 30, 2018	338,940			$	57.85

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, 2018:

	Awards			Weighted- Average Fair Value
Unvested at December 31, 2017	148,508			$	60.23
Granted	44,144			62.80
Vested	—			—
Forfeited	(52,342	)		65.31
Unvested at June 30, 2018	140,310			$	59.33

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, 2018			June 30, 2017		June 30, 2018			June 30, 2017
Risk free interest rate	2.8	%		n/a		2.5	%		1.9	%
Expected life (in years)	5			n/a		5			5
Expected volatility	28	%		n/a		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 six months ended June 30, 2018 and 2017 was estimated using the following weighted-average assumptions:

	Six Months Ended
	June 30, 2018				June 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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