ACQUISITION - Proforma (Details3) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		7 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016
ACQUISITION
Revenue		$ 153,880	$ 73,907		$ 388,254	$ 215,665
Net income		1,224			(7,164)	(285,359)
Pro forma information
Revenue		156,045	82,824
Net loss		3,195	(34,344)
Less: net loss attributable to noncontrolling interests		(1,706)	19,284
Net loss attributable to Select Energy Services, Inc.		$ 1,489	$ (15,060)
Resource Water Acquisition
ACQUISITION
Revenue	$ 200
Net income	$ 100
GRR Acquisition
ACQUISITION
Revenue				$ 21,500
Net income				$ 1,900
Pro forma information
Revenue					400,948	237,644
Net loss					(17,951)	(289,130)
Less: net loss attributable to noncontrolling interests					11,682	163,044
Net loss attributable to Select Energy Services, Inc.					$ (6,269)	$ (126,086)