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STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 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 months ended March 31, 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
	March 31, 2017				March 31, 2016
Stock-settled stock appreciation rights granted	443,731				703,510
Weighted-average fair value	$	20.65			$	12.88
Restricted stock units granted	98,680				143,168
Weighted-average fair value	$	71.65			$	42.44
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 three months ended March 31, 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	443,731			71.65
Exercised	(448,171	)		42.19
Forfeited	(23,378	)		48.69
Outstanding at March 31, 2017	2,411,669			58.10				6.7		$	32,429
Exercisable at March 31, 2017	1,466,997			$	57.57			5.1		$	21,453

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 three months ended March 31, 2017:

	Awards			Weighted- Average Fair Value
Unvested at December 31, 2016	257,096			$	57.47
Granted	98,680			71.65
Vested	(43,169	)		85.17
Forfeited	(4,747	)		51.12
Unvested at March 31, 2017	307,860			$	58.23

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

The following table sets forth a summary of performance-based awards for the three months ended March 31, 2017:

	Awards			Weighted- Average Fair Value
Unvested at December 31, 2016	149,320			$	60.36
Granted	39,978			76.63
Vested	—			—
Forfeited	(35,122	)		80.48
Unvested at March 31, 2017	154,176			$	59.99

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]

	Three Months Ended
	March 31, 2017			March 31, 2016
Risk free interest rate	1.9	%		1.2	%
Expected life (in years)	5			5
Expected volatility	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]

	Three Months Ended
	March 31, 2017				March 31, 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		%

X

- 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=6415400&loc=d3e5070-113901

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+ References

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-SubTopic 10
-Section 50
-Paragraph 2
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+ References

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