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SELECTED QUARTERLY FINANCIAL DATA (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 2,099,452 | $ 2,148,110 | $ 2,150,088 | $ 1,961,267 | $ 2,011,447 | $ 2,067,245 | $ 2,103,994 | $ 1,993,915 | $ 8,358,917 | $ 8,176,601 | $ 7,679,021
Cost of goods sold | 1,709,658 | 1,747,913 | 1,741,114 | 1,578,771 | 1,621,117 | 1,670,037 | 1,704,100 | 1,613,966 | 6,777,456 | 6,609,220 | 6,194,366
Income from operations | 83,808 | 93,733 | 97,950 | 70,726 | 90,499 | 97,517 | 91,183 | 73,241 | 346,217 | 352,440 | 319,040
Income before income taxes | 67,587 | 80,225 | 80,643 | 53,606 | 73,658 | 80,467 | 73,442 | 53,458 | 282,061 | 281,025 | 252,440
Net income | 52,694 | 64,339 | 63,215 | 41,950 | 58,066 | 66,645 | 57,673 | 42,971 | 222,198 | 225,355 | 163,133
Net Income attributable to WESCO International, Inc. | $ 53,098 | $ 64,495 | $ 63,464 | $ 42,369 | $ 58,133 | $ 66,849 | $ 57,940 | $ 44,421 | $ 223,426 | $ 227,343 | $ 163,460
Basic earnings per share attributable to WESCO International, Inc. | $ 1.27 | $ 1.53 | $ 1.46 | $ 0.94 | $ 1.27 | $ 1.42 | $ 1.23 | $ 0.94 | $ 5.18 | $ 4.87 | $ 3.42
Diluted earnings per share attributable to WESCO International, Inc. | $ 1.26 | $ 1.52 | $ 1.45 | $ 0.93 | $ 1.26 | $ 1.41 | $ 1.22 | $ 0.93 | $ 5.14 | $ 4.82 | $ 3.38

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