BUSINESS ACQUISITIONS, Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Units Acquired In 2015 and 2016 [Member]
Pro Forma Information [Abstract]
Net sales	$ 939.4	$ 1,228.9
Net income (loss)	$ 5.5	$ (40.7)
Per share data attributable to DXP Enterprises, Inc. [Abstract]
Basic earnings (loss) (in dollars per share)	$ 0.37	$ (2.83)
Diluted earnings (loss) (in dollars per share)	$ 0.35	$ (2.83)
Units acquired in 2014 and 2015 [Member]
Pro Forma Information [Abstract]
Net sales		$ 1,263.0	$ 1,541.0
Net income (loss)		$ (37.0)	$ (44.0)
Per share data attributable to DXP Enterprises, Inc. [Abstract]
Basic earnings (loss) (in dollars per share)		$ (2.60)	$ (2.99)
Diluted earnings (loss) (in dollars per share)		$ (2.60)	$ (2.99)