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NONCONTROLLING INTERESTS - Effect of Changes (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Effects of changes in noncontrolling interests on equity                      
Net (loss) income attributable to Select Energy Services, Inc. $ (17,983) $ (30,541) $ (44,298) $ (245,862) $ (9,930) $ 5,379 $ 6,200 $ 1,135 $ (338,684) $ 2,784 $ 36,512
Transfers (to) from noncontrolling interests:                      
Noncontrolling interest in subsidiary                 200 400  
Increase in additional paid-in capital as a result of stock option exercises                   54 374
Increase in additional paid-in capital as a result of restricted stock issuance, net of forfeitures                 1,874 3,614 1,942
Increase in additional paid-in capital as a result of issuance of common stock due to vesting of restricted stock units                 1 4 104
Decrease in additional paid-in capital as a result of the repurchase of SES Holdings LLC Units                 (1,416) (3,362) (576)
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                   107,062 146,865
Increase (decrease) in additional paid-in capital as a result of the Employee Stock Purchase Plan shares issued                 7 42 15
Change to equity from net (loss) income attributable to Select Energy Services, Inc. and transfers from noncontrolling interests                 $ (338,218) $ 110,198 $ 185,236