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QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) (Details) - USD ($)
$ / shares in Units, $ 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
Quarterly Financial Data [Abstract]                      
Revenue $ 133,339 $ 101,242 $ 92,239 $ 278,285 $ 276,088 $ 328,968 $ 323,887 $ 362,646 $ 605,105 $ 1,291,589 $ 1,528,930
Gross profit (loss) (3,942) (16,900) (23,719) 15,296 21,810 40,994 39,939 45,997 (29,265) 148,740 198,482
Income (loss) from operations (21,929) (34,212) (47,805) (290,831) (7,213) 12,475 11,179 6,633 (394,777) 23,074 61,674
Net (loss) income (21,208) (36,260) (53,044) (291,220) (12,504) 7,172 8,068 1,400 (401,732) 4,136 54,299
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
Class A Common Stock                      
Quarterly Financial Data [Abstract]                      
Net (loss) income attributable to Select Energy Services, Inc.                 $ (338,684) $ 2,784 35,720
Net income (loss) per share attributable to common stockholders:                      
Basic & Diluted $ (0.21) $ (0.36) $ (0.52) $ (2.86) $ (0.12) $ 0.07 $ 0.08 $ 0.01      
Class A-2 Common Stock                      
Quarterly Financial Data [Abstract]                      
Net (loss) income attributable to Select Energy Services, Inc.                     $ 792