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STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity

The following table sets forth a summary of stock-settled stock appreciation rights and related information for the years indicated:

	2017													2016							2015
	Awards			Weighted-Average Exercise Price				Weighted-Average Remaining Contractual Life		Aggregate Intrinsic Value (In thousands)				Awards			Weighted-Average Exercise Price				Awards			Weighted-Average Exercise Price
Beginning of year	2,439,487			$	52.62									2,567,021			$	54.47			2,480,745			$	50.91
Granted	455,807			71.21										709,999			42.63				394,182			69.54
Exercised	(495,181	)		42.19										(526,818	)		41.54				(232,542	)		35.80
Canceled	(161,506	)		66.06										(310,715	)		63.71				(75,364	)		73.59
End of year	2,238,607			57.75				6.2		$	28,791			2,439,487			52.62				2,567,021			54.47
Exercisable at end of year	1,331,580			$	56.96			4.6		$	18,801			1,549,350			$	53.35			2,034,263			$	49.36

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

WESCO granted the following stock-settled stock appreciation rights at the following weighted-average assumptions:

	2017		2016		2015
Stock-settled stock appreciation rights granted	455,807		709,999		394,182
Risk free interest rate	1.9%		1.2%		1.6%
Expected life (in years)	5		5		5
Expected volatility	29%		32%		32%

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

The following table sets forth a summary of time-based restricted stock units and related information for the years ended December 31, 2017, 2016 and 2015:

	2017							2016							2015
	Awards			Weighted-Average Fair Value				Awards			Weighted-Average Fair Value				Awards			Weighted-Average Fair Value
Unvested at beginning of year	257,096			$	57.47			175,411			$	74.52			185,457			$	73.87
Granted	100,993			71.33				162,256			44.45				81,022			69.05
Vested	(44,720	)		84.57				(60,015	)		72.41				(76,387	)		66.89
Forfeited	(23,315	)		57.52				(20,556	)		59.15				(14,681	)		75.73
Unvested at end of year	290,054			$	58.11			257,096			$	57.47			175,411			$	74.52

The following table sets forth a summary of performance-based awards for the year ended December 31, 2017:

	2017							2016							2015
	Awards			Weighted-Average Fair Value				Awards			Weighted-Average Fair Value				Awards			Weighted-Average Fair Value
Unvested at beginning of year	149,320			$	60.36			114,520			$	76.48			130,004			$	80.21
Granted	39,978			76.63				91,768			47.00				59,661			67.81
Vested	—			—				—			—				(38,869	)		72.25
Forfeited	(40,790	)		76.77				(56,968	)		71.25				(36,276	)		80.14
Unvested at end of year	148,508			$	60.23			149,320			$	60.36			114,520			$	76.48

Schedule of Share-based Payment Award, Performance-based Awards, Valuation Assumptions [Table Text Block]

The fair value of the performance shares based on total stockholder return granted during the year ended December 31, 2017, 2016 and 2015 were estimated using the following weighted-average assumptions:

	Year ended December 31,
	2017				2016				2015
Grant date share price	$	71.65			$	42.44			$	69.54
WESCO expected volatility	29		%		26		%		27		%
Peer group median volatility	24		%		24		%		23		%
Risk-free interest rate	1.5		%		0.9		%		1.1		%
Correlation	114		%		122		%		96		%

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
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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.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Schedule of Share-based Payment Award, Performance-based Awards, Valuation Assumptions [Table Text Block]

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