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NONCONTROLLING INTERESTS - Effect of Changes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Effects of changes in noncontrolling interests on equity        
Net income attributable to Select Energy Services, Inc. $ 6,200 $ 16,963 $ 7,335 $ 27,062
Transfers (to) from noncontrolling interests:        
Increase (decrease) in additional paid-in capital as a result of stock option exercises       (1)
Increase in additional paid-in capital as a result of restricted stock issuance, net of forfeitures     3,540 2,195
Increase in additional paid-in capital as a result of issuance of common stock due to vesting of restricted stock units     4 104
(Decrease) increase in additional paid-in capital as a result of the repurchase of SES Holdings LLC Units     (25) 74
Increase in additional paid-in capital as a result of exchanges of SES Holdings LLC Units (an equivalent number of shares of Class B Common Stock) for shares of Class A Common Stock       111,803
Increase (decrease) in additional paid-in capital as a result of the Employee Stock Purchase Plan shares issued     2 (4)
Change to equity from net income attributable to Select Energy Services, Inc. and transfers from noncontrolling interests     $ 10,856 $ 141,233