CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue
Water solutions and related services	$ 546,043	$ 241,455	$ 427,496
Accommodations and rentals	53,888	27,151	52,948
Wellsite completion and construction services	50,974	33,793	55,133
Oilfield chemical product sales	41,586
Total revenue	692,491	302,399	535,577
Costs of revenue
Water solutions and related services	411,215	200,399	332,411
Accommodations and rentals	41,885	22,019	37,957
Wellsite completion and construction services	42,942	29,089	48,356
Oilfield chemical product sales	37,024
Depreciation and amortization	101,645	95,020	104,608
Total costs of revenue	634,711	346,527	523,332
Gross profit (loss)	57,780	(44,128)	12,245
Operating expenses
Selling, general and administrative	82,403	34,643	56,548
Depreciation and amortization	1,804	2,087	3,104
Impairment of goodwill and other intangible assets		138,666	21,366
Impairment of property and equipment		60,026
Lease abandonment costs	3,572	19,423
Total operating expenses	87,779	254,845	81,018
Loss from operations	(29,999)	(298,973)	(68,773)
Other income (expense)
Interest expense, net	(6,629)	(16,128)	(13,689)
Foreign currency gains, net	281
Other income, net	369	629	893
Loss before tax expense	(35,978)	(314,472)	(81,569)
Tax benefit (expense)	851	524	(324)
Net loss from continuing operations	(35,127)	(313,948)	(81,893)
Net income from discontinued operations, net of tax			21
Net loss	(35,127)	(313,948)	(81,872)
Less: net loss attributable to noncontrolling interests	18,311	6,424	981
Net loss attributable to Select Energy Services, Inc.	(16,816)	(1,043)
Predecessor
Other income (expense)
Net loss		(306,481)	(80,891)
Less: net loss attributable to noncontrolling interests		306,481	$ 80,891
Class A Common Stock
Other income (expense)
Net loss attributable to Select Energy Services, Inc.	$ (12,560)	$ (199)
EARNINGS PER SHARE
Weighted average shares outstanding:	24,612,853	3,802,972
Net loss per share attributable to common stockholders:	$ (0.51)	$ (0.05)
Class A-1 Common Stock
Other income (expense)
Net loss attributable to Select Energy Services, Inc.	$ (3,691)	$ (844)
EARNINGS PER SHARE
Weighted average shares outstanding:	7,233,973	16,100,000
Net loss per share attributable to common stockholders:	$ (0.51)	$ (0.05)
Class A-2 Common Stock
Other income (expense)
Net loss attributable to Select Energy Services, Inc.	$ (565)
EARNINGS PER SHARE
Weighted average shares outstanding:	1,106,605
Net loss per share attributable to common stockholders:	$ (0.51)
Class B Common Stock
EARNINGS PER SHARE
Weighted average shares outstanding:	38,768,156	38,462,541