INCOME (LOSS) PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Calculation of basic and diluted earnings per share:
Net income (loss)	$ 24,717	$ (14,204)	$ 47,283	$ (61,240)
Net income (loss) attributable to noncontrolling interests	(3,393)	2,160	(6,654)	9,522
Net income (loss) attributable to Select Energy Services, Inc.	21,324	(12,044)	40,629	(51,718)
Add: Reallocation of net income (loss) attributable to noncontrolling interests for the dilutive effect of restricted stock	30		62
Add: Reallocation of net income (loss) attributable to noncontrolling interests for the dilutive effect of performance units	20		33
Net income (loss) attributable to Select Energy Services, Inc. - diluted	$ 21,374	$ (12,044)	$ 40,724	$ (51,718)
Class A Common Stock
Calculation of basic and diluted earnings per share:
Antidilutive shares	1,677,927	2,105,965	1,677,927	2,105,965
Net income (loss) attributable to Select Energy Services, Inc.	$ 21,324	$ (12,044)	$ 40,629	$ (51,718)
Add: Reallocation of net income (loss) attributable to noncontrolling interests for the dilutive effect of restricted stock	30		62
Add: Reallocation of net income (loss) attributable to noncontrolling interests for the dilutive effect of performance units	20		33
Net income (loss) attributable to Select Energy Services, Inc. - diluted	$ 21,374	$ (12,044)	$ 40,724	$ (51,718)
Weighted-average shares of common stock outstanding - basic	94,014,963	88,596,736	93,231,711	86,290,886
Weighted-average shares of common stock outstanding - diluted	95,520,365	88,596,736	94,714,659	86,290,886
Income (loss) per share, Basic (in dollars per share)	$ 0.23	$ (0.14)	$ 0.44	$ (0.60)
Income (loss) per share, Diluted (in dollars per share)	$ 0.22	$ (0.14)	$ 0.43	$ (0.60)
Class A Common Stock | Restricted Stock
Calculation of basic and diluted earnings per share:
Dilutive effect	893,562		973,378
Class A Common Stock | Performance share units
Calculation of basic and diluted earnings per share:
Dilutive effect	611,763		509,336
Class A Common Stock | ESPP
Calculation of basic and diluted earnings per share:
Dilutive effect	77		234
Class B Common Stock
Calculation of basic and diluted earnings per share:
Weighted-average shares of common stock outstanding - basic	16,221,101	16,221,101	16,221,101	16,221,101
Weighted-average shares of common stock outstanding - diluted	16,221,101	16,221,101	16,221,101	16,221,101