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SELECTED QUARTERLY FINANCIAL DATA (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Gain (Loss) on Extinguishment of Debt                 $ 0 $ 0 $ (123,933)
Revenues $ 2,011,447 $ 2,067,245 $ 2,103,994 $ 1,993,915 $ 1,996,647 $ 2,000,159 $ 1,909,624 $ 1,772,591 8,176,601 7,679,021 7,336,017
Cost of goods sold 1,621,117 1,670,037 1,704,100 1,613,966 1,613,469 1,614,814 1,543,510 1,422,573 6,609,220 6,194,366 5,887,814
Income from operations 90,499 97,517 91,183 73,241 81,446 89,250 83,105 67,089 352,440 319,040 330,546
Income before income taxes 73,658 80,467 73,442 53,458 63,844 71,939 66,289 50,368 281,025 252,440 131,551
Net income 58,066 66,645 57,673 42,971 22,222 53,576 49,535 37,800 225,355 163,133 101,120
Net Income attributable to WESCO International, Inc. $ 58,133 $ 66,849 $ 57,940 $ 44,421 $ 22,546 $ 53,675 $ 49,510 $ 37,729 $ 227,343 $ 163,460 $ 101,588
Basic earnings per share attributable to WESCO International, Inc. $ 1.27 $ 1.42 $ 1.23 $ 0.94 $ 0.48 $ 1.13 $ 1.03 $ 0.77 $ 4.87 $ 3.42 $ 2.30
Diluted earnings per share attributable to WESCO International, Inc. $ 1.26 $ 1.41 $ 1.22 $ 0.93 $ 0.47 $ 1.12 $ 1.02 $ 0.76 $ 4.82 $ 3.38 $ 2.10