EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 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	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Calculation of basic and diluted earnings per share:
Net loss	$ (14,950)	$ 2,593	$ (10,490)	$ (12,280)	$ (24,713)	$ (35,204)	$ (228,238)	$ (25,793)	$ (35,127)	$ (313,948)	$ (81,872)
Less: net loss attributable to noncontrolling interests									18,311	6,424	981
Net loss attributable to Select Energy Services, Inc.	$ (9,652)	$ 1,224	$ (4,216)	$ (4,172)	$ (1,043)				(16,816)	(1,043)
Predecessor
Calculation of basic and diluted earnings per share:
Net loss										(306,481)	(80,891)
Less: net loss attributable to noncontrolling interests										306,481	$ 80,891
Class A-1 Common Stock
Calculation of basic and diluted earnings per share:
Net loss attributable to Select Energy Services, Inc.									$ (3,691)	$ (844)
Weighted average shares outstanding, diluted									7,233,973	16,100,000
Net income (loss) per share attributable to common stockholders, diluted									$ (0.51)	$ (0.05)
Class A-2 Common Stock
Calculation of basic and diluted earnings per share:
Net loss attributable to Select Energy Services, Inc.									$ (565)
Weighted average shares outstanding, diluted									1,106,605
Net income (loss) per share attributable to common stockholders, diluted									$ (0.51)
Class A Common Stock
Calculation of basic and diluted earnings per share:
Net loss attributable to Select Energy Services, Inc.									$ (12,560)	$ (199)
Weighted average shares outstanding, diluted									24,612,853	3,802,972
Net income (loss) per share attributable to common stockholders, diluted									$ (0.51)	$ (0.05)
Class B Common Stock
Calculation of basic and diluted earnings per share:
Weighted average shares outstanding, diluted									38,768,156	38,462,541