NONCONTROLLING INTERESTS - Effect of Changes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Effects of changes in noncontrolling interests on equity
Net income attributable to Select Water Solutions, Inc.	$ 12,868	$ 20,115	$ 16,493	$ 32,462
Transfers from (to) noncontrolling interests:
Increase in additional paid-in capital as a result of issuing shares for business combinations				9
Increase in additional paid-in capital as a result of restricted stock issuance, net of forfeitures			1,186	1,297
Increase in additional paid-in capital as a result of vested PSUs			311
Increase in additional paid-in capital as a result of the repurchase of SES Holdings LLC Units			121	54
Change to equity from net income attributable to Select Water Solutions, Inc. and transfers from noncontrolling interests			$ 18,111	$ 33,822