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EARNINGS PER SHARE (Tables) | 6 Months Ended
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Jun. 30, 2017
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 |  | Six Months Ended
| June 30, |  | June 30,
(In thousands, except per share data) | 2017 |  | 2016 |  | 2017 |  | 2016
Net income attributable to WESCO International, Inc. | $ | 49,510 |  |  | $ | 49,798 |  |  | $ | 87,238 |  |  | $ | 85,852 |
Weighted-average common shares outstanding used in computing basic earnings per share | 48,294 |  |  | 42,238 |  |  | 48,499 |  |  | 42,224 |
Common shares issuable upon exercise of dilutive equity awards | 482 |  |  | 569 |  |  | 582 |  |  | 494 |
Common shares issuable from contingently convertible debentures (see below for basis of calculation) | — |  |  | 5,820 |  |  | — |  |  | 5,120 |
Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share | 48,776 |  |  | 48,627 |  |  | 49,081 |  |  | 47,838 |
Earnings per share attributable to WESCO International, Inc. |  |  |  |  |  |  |
Basic | $ | 1.03 |  |  | $ | 1.18 |  |  | $ | 1.80 |  |  | $ | 2.03 |
Diluted | $ | 1.02 |  |  | $ | 1.02 |  |  | $ | 1.78 |  |  | $ | 1.79 |

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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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