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STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 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 months ended March 31, 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
	March 31, 2018				March 31, 2017
Stock-settled stock appreciation rights granted	491,229				443,731
Weighted-average fair value	$	18.40			$	20.65
Restricted stock units granted	114,269				98,680
Weighted-average fair value	$	62.81			$	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 three months ended March 31, 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	491,229			62.81
Exercised	(93,145	)		42.52
Forfeited	(48,248	)		65.57
Outstanding at March 31, 2018	2,588,443			59.11				6.6		$	19,575
Exercisable at March 31, 2018	1,639,025			$	57.81			5.1		$	16,000

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, 2018:

	Awards			Weighted- Average Fair Value
Unvested at December 31, 2017	290,054			$	58.11
Granted	114,269			62.81
Vested	(57,175	)		69.44
Forfeited	(8,572	)		56.00
Unvested at March 31, 2018	338,576			$	57.84

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, 2018:

	Awards			Weighted- Average Fair Value
Unvested at December 31, 2017	148,508			$	60.23
Granted	44,144			62.80
Vested	—			—
Forfeited	(46,858	)		65.44
Unvested at March 31, 2018	145,794			$	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
	March 31, 2018			March 31, 2017
Risk free interest rate	2.5	%		1.9	%
Expected life (in years)	5			5
Expected volatility	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 three months ended March 31, 2018 and 2017 was estimated using the following weighted-average assumptions:

	Three Months Ended
	March 31, 2018				March 31, 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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- 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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+ 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)(1)
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+ References

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-Section 50
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+ References

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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