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EARNINGS PER SHARE (Tables) | 9 Months Ended
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Sep. 30, 2016
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 |  | Nine Months Ended
| September 30, |  | September 30,
(In thousands, except per share data) | 2016 |  | 2015 |  | 2016 |  | 2015
Net (loss) income attributable to WESCO International, Inc. | $ | (31,611 | ) |  | $ | 63,503 |  |  | $ | 54,243 |  |  | $ | 162,273 |
Weighted-average common shares outstanding used in computing basic earnings per share | 43,378 |  |  | 43,191 |  |  | 42,611 |  |  | 43,860 |
Common shares issuable upon exercise of dilutive equity awards | 511 |  |  | 538 |  |  | 519 |  |  | 717 |
Common shares issuable from contingently convertible debentures (see below for basis of calculation) | 4,851 |  |  | 5,989 |  |  | 4,908 |  |  | 6,738 |
Weighted-average common shares outstanding and common share equivalents, diluted | 48,740 |  |  | 49,718 |  |  | 48,038 |  |  | 51,315 |
Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share | 43,378 |  |  | 49,718 |  |  | 48,038 |  |  | 51,315 |
(Loss) earnings per share attributable to WESCO International, Inc. |  |  |  |  |  |  |
Basic | $ | (0.73 | ) |  | $ | 1.47 |  |  | $ | 1.27 |  |  | $ | 3.70 |
Diluted | $ | (0.73 | ) |  | $ | 1.28 |  |  | $ | 1.13 |  |  | $ | 3.16 |

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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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