QUARTERLY RESULTS OF OPERATIONS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Data [Abstract]
Revenue	$ 304,237	$ 153,880	$ 134,449	$ 99,925	$ 86,734	$ 73,907	$ 62,919	$ 78,839	$ 692,491	$ 302,399	$ 535,577
Gross profit (loss)	26,259	19,509	12,254	(242)	(5,922)	(8,970)	(17,299)	(11,937)	57,780	(44,128)	12,245
Income (loss) from operations	(8,039)	2,457	(11,909)	(12,508)	(21,334)	(31,266)	(224,822)	(21,551)	(29,999)	(298,973)	(68,773)
Net income (loss)	(14,950)	2,593	(10,490)	(12,280)	(24,713)	$ (35,204)	$ (228,238)	$ (25,793)	(35,127)	(313,948)	$ (81,872)
Net loss attributable to Select Energy Services, Inc. and its Predecessor	$ (9,652)	$ 1,224	$ (4,216)	$ (4,172)	$ (1,043)				(16,816)	(1,043)
Class A Common Stock
Quarterly Financial Data [Abstract]
Net loss attributable to Select Energy Services, Inc. and its Predecessor									$ (12,560)	$ (199)
Net income (loss) per share attributable to common stockholders:
Basic & Diluted	$ (0.18)	$ 0.04	$ (0.16)	$ (0.21)	$ (0.05)				$ (0.51)	$ (0.05)
Class A-1 Common Stock
Quarterly Financial Data [Abstract]
Net loss attributable to Select Energy Services, Inc. and its Predecessor									$ (3,691)	$ (844)
Net income (loss) per share attributable to common stockholders:
Basic & Diluted			$ (0.16)	$ (0.21)	$ (0.05)				$ (0.51)	$ (0.05)
Class A-2 Common Stock
Quarterly Financial Data [Abstract]
Net loss attributable to Select Energy Services, Inc. and its Predecessor									$ (565)
Net income (loss) per share attributable to common stockholders:
Basic & Diluted	$ (0.18)								$ (0.51)