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SEGMENTS AND RELATED INFORMATION (Tables)

12 Months Ended

Dec. 31, 2017

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,
	2017							2016							2015							2017				2016				2015
(In thousands)
United States	$	5,775,988			75	%		$	5,635,803			77	%		$	5,665,962			75	%		$	95,851			$	123,465			$	157,570
Canada	1,521,378				20	%		1,394,657				19	%		1,533,705				21	%		56,591				60,372				63,088
Mexico	77,280				1	%		62,430				1	%		70,048				1	%		262				227				332
Subtotal North American Operations	7,374,646							7,092,890							7,269,715							152,704				184,064				220,990
Other International	304,375				4	%		243,127				3	%		248,772				3	%		3,741				4,583				5,369
Total	$	7,679,021						$	7,336,017						$	7,518,487						$	156,445			$	188,647			$	226,359

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,	2017		2016		2015
(percentages based on total sales)
General Supplies	40%		40%		40%
Wire, Cable and Conduit	15%		14%		15%
Communications and Security	15%		15%		15%
Electrical Distribution and Controls	10%		11%		11%
Lighting and Sustainability	12%		12%		10%
Automation, Controls and Motors	8%		8%		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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