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EARNINGS PER SHARE (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table sets forth the details of basic and diluted earnings per share:
| Three Months Ended
| March 31,
(In thousands, except per share data) | 2018 |  | 2017
Net income attributable to WESCO International, Inc. | $ | 44,421 |  |  | $ | 37,729 |
Weighted-average common shares outstanding used in computing basic earnings per share | 47,038 |  |  | 48,707 |
Common shares issuable upon exercise of dilutive equity awards | 570 |  |  | 694 |
Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share | 47,608 |  |  | 49,401 |
Earnings per share attributable to WESCO International, Inc. |  |  |
Basic | $ | 0.94 |  |  | $ | 0.77 |
Diluted | $ | 0.93 |  |  | $ | 0.76 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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