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SELECTED QUARTERLY FINANCIAL DATA (Tables) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information |
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
2016 |  |  |  |  |  |  |
Net Sales | $ | 1,775,961 |  |  | $ | 1,911,582 |  |  | $ | 1,855,212 |  |  | $ | 1,793,262 |
Cost of goods sold (excluding depreciation and amortization) | 1,420,793 |  |  | 1,532,113 |  |  | 1,490,173 |  |  | 1,444,735 |
Income from operations | 69,508 |  |  | 87,987 |  |  | 92,555 |  |  | 82,009 |
Income (loss) before income taxes | 50,679 |  |  | 68,535 |  |  | (52,170 | ) |  | 64,507 |
Net income (loss) | 34,534 |  |  | 49,852 |  |  | (31,021 | ) |  | 47,755 |
Net income (loss) attributable to WESCO International | 36,053 |  |  | 49,798 |  |  | (31,611 | ) |  | 47,348 |
Basic earnings (loss) per share attributable to WESCO International, Inc.(A) (C) | 0.85 |  |  | 1.18 |  |  | (0.73 | ) |  | 0.97 |
Diluted earnings (loss) per share attributable to WESCO International, Inc.(B) (C) | 0.77 |  |  | 1.02 |  |  | (0.73 | ) |  | 0.96 |
2015 |  |  |  |  |  |  |
Net Sales | $ | 1,816,330 |  |  | $ | 1,916,718 |  |  | $ | 1,923,899 |  |  | $ | 1,861,540 |
Cost of goods sold (excluding depreciation and amortization) | 1,448,639 |  |  | 1,535,084 |  |  | 1,543,113 |  |  | 1,497,990 |
Income from operations | 87,185 |  |  | 90,253 |  |  | 106,348 |  |  | 89,956 |
Income before income taxes | 66,291 |  |  | 71,640 |  |  | 85,931 |  |  | 80,048 |
Net income | 46,793 |  |  | 50,639 |  |  | 62,384 |  |  | 48,557 |
Net income attributable to WESCO International | 47,031 |  |  | 51,741 |  |  | 63,503 |  |  | 48,412 |
Basic earnings per share attributable to WESCO International, Inc.(A) | 1.06 |  |  | 1.18 |  |  | 1.47 |  |  | 1.15 |
Diluted earnings per share attributable to WESCO International, Inc.(B) | 0.90 |  |  | 1.00 |  |  | 1.28 |  |  | 1.03 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1280-108306 + Details
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