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SEGMENTS AND RELATED INFORMATION (Tables)

12 Months Ended

Dec. 31, 2016

Segment Reporting [Abstract]

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas

WESCO attributes revenues from external customers to individual countries on the basis of the point of sale. The following table sets forth information about WESCO by geographic area:

	Net Sales Year Ended December 31,																					Long-Lived Assets December 31,
	2016							2015							2014							2016				2015				2014
(In thousands)
United States	$	5,635,803			77	%		$	5,665,962			75	%		$	5,618,240			71	%		$	123,465			$	157,570			$	127,670
Canada	1,394,657				19	%		1,533,705				21	%		1,899,173				24	%		60,372				63,088				80,080
Mexico	62,430				1	%		70,048				1	%		95,585				1	%		227				332				442
Subtotal North American Operations	7,092,890							7,269,715							7,612,998							184,064				220,990				208,192
Other International	243,127				3	%		248,772				3	%		276,628				4	%		4,583				5,369				8,213
Total	$	7,336,017						$	7,518,487						$	7,889,626						$	188,647			$	226,359			$	216,405

Revenue from External Customers by Products and Services

The following table sets forth sales information about WESCO’s sales by product category:

Year Ended December 31,	2016		2015		2014
(percentages based on total sales)
General Supplies	40%		40%		40%
Wire, Cable and Conduit	14%		15%		16%
Communications and Security	15%		15%		14%
Electrical Distribution and Controls	11%		11%		11%
Lighting and Sustainability	12%		10%		10%
Automation, Controls and Motors	8%		9%		9%

X

- Definition

Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9031-108599

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X

- Definition

Tabular disclosure of information concerning material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. An entity may also provide subtotals of geographic information about groups of countries.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599

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- References

No definition available.

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