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SELECTED QUARTERLY FINANCIAL DATA (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2014
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                        
Gain (Loss) on Extinguishment of Debt                 $ (123,900) $ (123,933) $ 0 $ 0
Net sales $ 1,793,262 $ 1,855,212 $ 1,911,582 $ 1,775,961 $ 1,861,540 $ 1,923,899 $ 1,916,718 $ 1,816,330   7,336,017 7,518,487 7,889,626
Cost of goods sold 1,444,735 1,490,173 1,532,113 1,420,793 1,497,990 1,543,113 1,535,084 1,448,639   5,887,814 6,024,826 6,278,584
Income from operations 82,009 92,555 87,987 69,508 89,956 106,348 90,253 87,185   332,059 373,742 466,217
Income before income taxes 64,507 (52,170) 68,535 50,679 80,048 85,931 71,640 66,291   131,551 303,910 384,153
Net income 47,755 (31,021) 49,852 34,534 48,557 62,384 50,639 46,793   101,120 208,373 275,437
Net Income attributable to WESCO International, Inc. $ 47,348 $ (31,611) $ 49,798 $ 36,053 $ 48,412 $ 63,503 $ 51,741 $ 47,031   $ 101,588 $ 210,687 $ 275,906
Basic earnings per share attributable to WESCO International, Inc. $ 0.97 $ (0.73) $ 1.18 $ 0.85 $ 1.15 $ 1.47 $ 1.18 $ 1.06   $ 2.30 $ 4.85 $ 6.21
Diluted earnings per share attributable to WESCO International, Inc. $ 0.96 $ (0.73) $ 1.02 $ 0.77 $ 1.03 $ 1.28 $ 1.00 $ 0.90   $ 2.10 $ 4.18 $ 5.18