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REVENUE (Tables) | 9 Months Ended
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Sep. 30, 2018
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue [Table Text Block] | The following tables disaggregate WESCO’s revenue by end market and geography:
| Three Months Ended |  | Nine Months Ended
| September 30 |  | September 30
(In thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Industrial | $ | 723,869 |  |  | $ | 722,227 |  |  | $ | 2,243,590 |  |  | $ | 2,111,813 |
Construction | 686,165 |  |  | 674,996 |  |  | 2,007,708 |  |  | 1,870,406 |
Utility | 345,937 |  |  | 312,501 |  |  | 998,438 |  |  | 861,162 |
Commercial, Institutional and Government ("CIG") | 311,274 |  |  | 290,435 |  |  | 915,418 |  |  | 838,994 |
Total by end market | $ | 2,067,245 |  |  | $ | 2,000,159 |  |  | $ | 6,165,154 |  |  | $ | 5,682,375 |
| Three Months Ended |  | Nine Months Ended
| September 30 |  | September 30
(In thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
United States | $ | 1,525,393 |  |  | $ | 1,473,016 |  |  | $ | 4,571,533 |  |  | $ | 4,267,684 |
Other (1) | 541,852 |  |  | 527,143 |  |  | 1,593,621 |  |  | 1,414,691 |
Total by geography | $ | 2,067,245 |  |  | $ | 2,000,159 |  |  | $ | 6,165,154 |  |  | $ | 5,682,375 |
(1) | Other primarily includes net sales originating in Canada.
Revenue Recognition, Revenue Reductions [Policy Text Block] | WESCO’s revenues are adjusted for variable consideration, which includes customer volume rebates, returns, and discounts. WESCO measures variable consideration by estimating expected outcomes using analysis and inputs based upon anticipated performance, historical data, as well as current and forecasted information. Measurement and recognition of variable consideration is reviewed by management on a monthly basis and revenue is adjusted accordingly. Variable consideration reduced revenue for the three months ended September 30, 2018 and 2017 by approximately $25.1 million and $24.2 million, respectively, and by approximately $74.5 million and $66.5 million for the nine months ended September 30, 2018 and 2017, respectively.

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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- Definition Disclosure of accounting policy of sales arrangements for goods or services that reduce the amount of revenue recognized for example sales returns, allowances, incentives, rebates, discounts and loyalty programs. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 + Details
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