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BUSINESS ACQUISITIONS, Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Pro Forma Information [Abstract] |  |  |
Net sales | $ 1,006.8 | $ 939.4 |
Net income (loss) attributable to DXP Enterprises, Inc. | $ 16.9 | $ 5.5 |
Per share data [Abstract] |  |  |
Basic earnings (loss) (in dollars per share) | $ 0.97 | $ 0.36 |
Diluted earnings (loss) (in dollars per share) | $ 0.93 | $ 0.35 |
Units Acquired In 2015 and 2016 [Member] |  |  |
Pro Forma Information [Abstract] |  |  |
Net sales |  | $ 939.4 | $ 1,228.9
Net income (loss) attributable to DXP Enterprises, Inc. |  | $ 5.5 | $ (40.7)
Per share data [Abstract] |  |  |
Basic earnings (loss) (in dollars per share) |  | $ 0.36 | $ (2.83)
Diluted earnings (loss) (in dollars per share) |  | $ 0.35 | $ (2.83)

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