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STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 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 nine months ended September 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								Nine Months Ended
	September 30, 2017				September 30, 2016				September 30, 2017				September 30, 2016
Stock-settled stock appreciation rights granted	12,076				1,745				455,807				709,999
Weighted-average fair value	$	15.74			$	16.68			$	20.52			$	12.91
Restricted stock units granted	2,313				—				100,993				143,305
Weighted-average fair value	$	57.30			$	—			$	71.33			$	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 nine months ended September 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	455,807			71.21
Exercised	(472,873	)		42.41
Forfeited	(143,506	)		66.21
Outstanding at September 30, 2017	2,278,915			57.60				6.4		$	18,344
Exercisable at September 30, 2017	1,359,744			$	56.71			4.8		$	12,212

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, 2017:

	Awards			Weighted- Average Fair Value
Unvested at December 31, 2016	257,096			$	57.47
Granted	100,993			71.33
Vested	(43,780	)		85.13
Forfeited	(18,022	)		55.96
Unvested at September 30, 2017	296,287			$	58.20

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, 2017:

	Awards			Weighted- Average Fair Value
Unvested at December 31, 2016	149,320			$	60.36
Granted	39,978			76.63
Vested	—			—
Forfeited	(39,650	)		77.40
Unvested at September 30, 2017	149,648			$	60.19

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, 2017			September 30, 2016			September 30, 2017			September 30, 2016
Risk free interest rate	1.8	%		1.3	%		1.9	%		1.2	%
Expected life (in years)	5			5			5			5
Expected volatility	28	%		31	%		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 nine months ended September 30, 2017 and 2016 was estimated using the following weighted-average assumptions:

	Nine Months Ended
	September 30, 2017				September 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		%

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock options and stock appreciation rights that were outstanding at the beginning and end of the year, exercisable at the end of the year, and the number of stock options and stock appreciation rights that were granted, exercised or converted, forfeited, and expired during the year.

+ References

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-SubTopic 10
-Section 50
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+ References

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-Topic 718
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