INCOME PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Calculation of basic and diluted earnings per share:
Antidilutive shares	692,074	999,050	692,074	720,953
Outstanding options (as a percent)	96.00%	100.00%	96.00%	72.00%
Net income	$ 22,562	$ 11,671	$ 31,994	$ 21,231
Net income attributable to noncontrolling interests	(1,527)	(1,024)	(2,353)	(2,345)
Net income attributable to Select Water Solutions, Inc.	21,035	10,647	29,641	18,886
Add: Reallocation of net income attributable to noncontrolling interests for the dilutive effect of restricted stock	22	9	39	29
Add: Reallocation of net income attributable to noncontrolling interests for the dilutive effect of performance units	24	18	44	36
Add: Reallocation of net income attributable to noncontrolling interests for the dilutive effect of stock options			1	2
Net income attributable to Select Water Solutions, Inc. - diluted	21,081	10,674	29,725	18,953
Class A common stock
Calculation of basic and diluted earnings per share:
Net income attributable to Select Water Solutions, Inc.	21,035	10,647	29,641	18,886
Add: Reallocation of net income attributable to noncontrolling interests for the dilutive effect of restricted stock	22	9	39	29
Add: Reallocation of net income attributable to noncontrolling interests for the dilutive effect of performance units	24	18	44	36
Add: Reallocation of net income attributable to noncontrolling interests for the dilutive effect of stock options			1	2
Net income attributable to Select Water Solutions, Inc. - diluted	$ 21,081	$ 10,674	$ 29,725	$ 18,953
Weighted-average shares of common stock outstanding - basic	123,146,866	101,527,407	116,682,176	101,161,203
Weighted-average shares of common stock outstanding - diluted	125,432,751	102,860,676	119,054,382	103,060,299
Income per share, Basic (in dollars per share)	$ 0.17	$ 0.1	$ 0.25	$ 0.19
Income per share, Diluted (in dollars per share)	$ 0.17	$ 0.1	$ 0.25	$ 0.18
Class A common stock \| Restricted stock
Calculation of basic and diluted earnings per share:
Dilutive effect	1,098,041	433,194	1,095,404	831,622
Class A common stock \| Performance share units
Calculation of basic and diluted earnings per share:
Dilutive effect	1,171,489	900,075	1,254,894	1,024,541
Class A common stock \| Stock Options
Calculation of basic and diluted earnings per share:
Dilutive effect	16,355		21,908	42,933
Class B common stock
Calculation of basic and diluted earnings per share:
Number of shares exchanged			5,063,000
Weighted-average shares of common stock outstanding - basic	12,733,751	16,221,101	14,467,792	16,221,101
Weighted-average shares of common stock outstanding - diluted	12,733,751	16,221,101	14,467,792	16,221,101

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482662/260-10-50-1