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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                        
Gain (Loss) on Extinguishment of Debt           $ (124,000)     $ 123,900 $ 0 $ (123,933) $ 0
Net sales $ 1,996,647 $ 2,000,159 $ 1,909,624 $ 1,772,591 $ 1,793,262 1,855,212 $ 1,911,582 $ 1,775,961   7,679,021 7,336,017 7,518,487
Cost of goods sold 1,613,469 1,614,814 1,543,510 1,422,573 1,444,735 1,490,173 1,532,113 1,420,793   6,194,366 5,887,814 6,024,826
Income from operations 81,446 89,250 83,105 67,089 82,009 92,555 87,987 69,508   320,890 332,059 373,742
Income before income taxes 63,844 71,939 66,289 50,368 64,507 (52,170) 68,535 50,679   252,440 131,551 303,910
Net income 22,222 53,576 49,535 37,800 47,755 (31,021) 49,852 34,534   163,133 101,120 208,373
Net Income attributable to WESCO International, Inc. $ 22,546 $ 53,675 $ 49,510 $ 37,729 $ 47,348 $ (31,611) $ 49,798 $ 36,053   $ 163,460 $ 101,588 $ 210,687
Basic earnings per share attributable to WESCO International, Inc. $ 0.48 $ 1.13 $ 1.03 $ 0.77 $ 0.97 $ (0.73) $ 1.18 $ 0.85   $ 3.42 $ 2.30 $ 4.85
Diluted earnings per share attributable to WESCO International, Inc. $ 0.47 $ 1.12 $ 1.02 $ 0.76 $ 0.96 $ (0.73) $ 1.02 $ 0.77   $ 3.38 $ 2.10 $ 4.18