INCOME PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Calculation of basic and diluted earnings per share:
Antidilutive shares	725,634	1,663,972	913,042	1,663,972
Net income	$ 14,899	$ 22,561	$ 18,774	$ 36,266
Net income attributable to noncontrolling interests	(2,031)	(2,446)	(2,281)	(3,804)
Net income attributable to Select Water Solutions, Inc.	12,868	20,115	16,493	32,462
Add: Reallocation of net income attributable to noncontrolling interests for the dilutive effect of restricted stock	19	29	27	51
Add: Reallocation of net income attributable to noncontrolling interests for the dilutive effect of performance units	21	20	28	24
Add: Reallocation of net income attributable to noncontrolling interests for the dilutive effect of stock options	2		1
Net income attributable to Select Water Solutions, Inc. - diluted	12,910	20,164	16,549	32,537
Class A common stock
Calculation of basic and diluted earnings per share:
Net income attributable to Select Water Solutions, Inc.	12,868	20,115	16,493	32,462
Add: Reallocation of net income attributable to noncontrolling interests for the dilutive effect of restricted stock	19	29	27	51
Add: Reallocation of net income attributable to noncontrolling interests for the dilutive effect of performance units	21	20	28	24
Add: Reallocation of net income attributable to noncontrolling interests for the dilutive effect of stock options	2		1
Net income attributable to Select Water Solutions, Inc. - diluted	$ 12,910	$ 20,164	$ 16,549	$ 32,537
Weighted-average shares of common stock outstanding - basic	100,128,034	101,106,729	99,676,319	103,243,226
Weighted-average shares of common stock outstanding - diluted	101,904,885	102,861,321	101,513,975	104,993,890
Income per share, Basic (in dollars per share)	$ 0.13	$ 0.20	$ 0.17	$ 0.31
Income per share, Diluted (in dollars per share)	$ 0.13	$ 0.20	$ 0.16	$ 0.31
Class A common stock | Restricted stock
Calculation of basic and diluted earnings per share:
Dilutive effect	820,945	1,036,404	889,647	1,200,106
Class A common stock | Performance share units
Calculation of basic and diluted earnings per share:
Dilutive effect	882,371	718,188	930,733	550,558
Class A common stock | Employee Stock Option
Calculation of basic and diluted earnings per share:
Dilutive effect	73,536		17,276
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