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EARNINGS PER SHARE (Tables) | 12 Months Ended
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Dec. 31, 2016
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted |
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
(In thousands, except per share data) |  |  |  |  |
Net income attributable to WESCO International | $ | 101,588 |  |  | $ | 210,687 |  |  | $ | 275,906 |
Weighted-average common shares outstanding used in computing basic earnings per share | 44,116 |  |  | 43,433 |  |  | 44,440 |
Common shares issuable upon exercise of dilutive equity awards | 543 |  |  | 626 |  |  | 997 |
Common shares issuable from contingently convertible debentures (see below for basis of calculation) | 3,674 |  |  | 6,314 |  |  | 7,821 |
Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share | 48,333 |  |  | 50,373 |  |  | 53,258 |
Earnings per share attributable to WESCO International |  |  |  |  |
Basic | $ | 2.30 |  |  | $ | 4.85 |  |  | $ | 6.21 |
Diluted | $ | 2.10 |  |  | $ | 4.18 |  |  | $ | 5.18 |

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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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