Select Energy Services (WTTR) 10-Q 13 Nov 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Nov. 08, 2017
Entity Registrant Name	Select Energy Services, Inc.
Entity Central Index Key	1,693,256
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Class A common stock
Entity Common Stock, Shares Outstanding		59,201,393
Class A-2 common stock
Entity Common Stock, Shares Outstanding		6,731,845
Class B common stock
Entity Common Stock, Shares Outstanding		40,331,989

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 42,393	$ 40,041
Accounts receivable trade, net of allowance for doubtful accounts of $2,867 and $2,144, respectively	148,372	75,892
Accounts receivable, related parties	433	135
Inventories	852	1,001
Prepaid expenses and other current assets	13,495	7,586
Total current assets	205,545	124,655
Property and equipment	815,002	739,386
Accumulated depreciation	(535,456)	(490,519)
Property and equipment, net	279,546	248,867
Goodwill	25,091	12,242
Other intangible assets, net	35,351	11,586
Other assets	7,216	7,716
Total assets	552,749	405,066
Current liabilities
Accounts payable	11,751	10,796
Accounts payable and accrued expenses, related parties	1,246	648
Accrued salaries and benefits	8,595	2,511
Accrued insurance	11,008	10,338
Accrued expenses and other current liabilities	39,713	22,091
Total current liabilities	72,313	46,384
Accrued lease obligations	18,100	15,946
Other long term liabilities	8,008	8,028
Total liabilities	98,421	70,358
Commitments and contingencies (Note 8)
Preferred stock
Additional paid-in capital	206,158	113,175
Accumulated deficit	(8,207)	(1,043)
Total stockholders’ equity	198,641	112,716
Noncontrolling interests	255,687	221,992
Total equity	454,328	334,708
Total liabilities and equity	552,749	405,066
Class A-1 common stock
Current liabilities
Common stock		161
Total equity		161
Class A common stock
Current liabilities
Common stock	305	38
Total equity	305	38
Class B common stock
Current liabilities
Common stock	385	385
Total equity	$ 385	$ 385

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Allowance for doubtful accounts	$ 2,867	$ 2,144
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	50,000,000	50,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Class A-1 common stock
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	40,000,000	40,000,000
Common Stock, Shares, Issued	0	16,100,000
Common Stock, Shares, Outstanding	0	16,100,000
Class A common stock
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	250,000,000	250,000,000
Common Stock, Shares, Issued	30,468,249	3,802,972
Common Stock, Shares, Outstanding	30,468,249	3,802,792
Class B common stock
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	150,000,000	150,000,000
Common Stock, Shares, Issued	38,462,541	38,462,541
Common Stock, Shares, Outstanding	38,462,541	38,462,541

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue
Water solutions	$ 125,086	$ 60,975	$ 311,275	$ 173,157
Accommodations and rentals	15,615	5,838	38,457	19,585
Wellsite completion and construction services	13,179	7,094	38,522	22,923
Total revenue	153,880	73,907	388,254	215,665
Costs of revenue
Water solutions	88,087	49,996	226,737	144,653
Accommodations and rentals	11,976	4,969	30,697	15,527
Wellsite completion and construction services	10,888	6,299	32,155	19,817
Depreciation and amortization	23,420	21,613	67,144	73,874
Total costs of revenue	134,371	82,877	356,733	253,871
Gross profit (loss)	19,509	(8,970)	31,521	(38,206)
Operating expenses
Selling, general and administrative	16,087	8,764	49,298	25,928
Depreciation and amortization	375	363	1,312	1,644
Impairment of goodwill and other intangible assets				138,666
Impairment of property and equipment				60,026
Lease abandonment costs	590	13,169	2,871	13,169
Total operating expenses	17,052	22,296	53,481	239,433
Income (Loss) from operations	2,457	(31,266)	(21,960)	(277,639)
Other income (expense)
Interest expense, net	(484)	(4,343)	(1,885)	(11,792)
Other income (expense), net	326	431	3,342	588
Income (loss) before tax expense	2,299	(35,178)	(20,503)	(288,843)
Tax expense	294	(26)	326	(392)
Net income (loss)	2,593	(35,204)	(20,177)	(289,235)
Less: Net (income) loss attributable to noncontrolling interests	(1,369)	273	13,013	3,876
Net income (loss) attributable to Select Energy Services, Inc.	1,224		(7,164)	(285,359)
Predecessor
Other income (expense)
Less: Net (income) loss attributable to noncontrolling interests		$ 34,931		$ 285,359
Class A-1 common stock
Other income (expense)
Net income (loss) attributable to Select Energy Services, Inc.			$ (2,679)
EARNINGS PER SHARE
Weighted average shares outstanding, basic			9,671,795
Net income (loss) per share attributable to common stockholders, basis			$ (0.28)
Weighted average shares outstanding, diluted			9,671,795
Net income (loss) per share attributable to common stockholders, diluted			$ (0.28)
Class A common stock
Other income (expense)
Net income (loss) attributable to Select Energy Services, Inc.	$ 1,224		$ (4,485)
EARNINGS PER SHARE
Weighted average shares outstanding, basic	30,336,923		16,189,997
Net income (loss) per share attributable to common stockholders, basis	$ 0.04		$ (0.28)
Weighted average shares outstanding, diluted	30,357,572		16,189,997
Net income (loss) per share attributable to common stockholders, diluted	$ 0.04		$ (0.28)
Class B common stock
EARNINGS PER SHARE
Weighted average shares outstanding, basic	38,462,541		38,462,541
Weighted average shares outstanding, diluted	38,462,541		38,462,541

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net income (loss)	$ 2,593	$ (35,204)	$ (20,177)	$ (289,235)
Interest rate derivatives designated as cash flow hedges
Unrealized holding loss arising during period				(106)
Net amount reclassified to earnings				113
Net change in unrealized gain				7
Comprehensive income (loss)	2,593	(35,204)	(20,177)	(289,228)
Less: Comprehensive (income) loss attributable to noncontrolling interests	(1,369)	273	13,013	3,876
Comprehensive income (loss) attributable to Select Energy Services, Inc.	$ 1,224		$ (7,164)
Predecessor
Interest rate derivatives designated as cash flow hedges
Less: Comprehensive (income) loss attributable to noncontrolling interests		$ 34,931		$ 285,352

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - 9 months ended Sep. 30, 2017 - USD ($) $ in Thousands	Class A-1 common stock	Class A common stock	Class B common stock	Total Stockholders’ Equity	Additional Paid-In Capital	Accumulated Deficit	Noncontrolling Interests	Total
Beginning balance at Dec. 31, 2016	$ 161	$ 38	$ 385	$ 112,716	$ 113,175	$ (1,043)	$ 221,992	$ 334,708
Beginning balance (in shares) at Dec. 31, 2016	16,100,000	3,802,972	38,462,541
Conversion of Class A-1 to Class A	$ (161)	$ 161
Conversion of Class A-1 to Class A (in shares)	(16,100,000)	16,100,000
Issuance of shares for acquisition		$ 6		4,366	4,360		5,514	9,880
Issuance of shares for acquisition (in shares)		560,277
Issuance of shares for initial public offering		$ 100		87,935	87,835		40,569	128,504
Issuance of shares for intial public offering (in shares)		10,005,000
Equity-based compensation				788	788		993	1,781
Noncontrolling interest in subsidiary							(368)	(368)
Net income (loss)				(7,164)		(7,164)	(13,013)	(20,177)
Ending balance at Sep. 30, 2017		$ 305	$ 385	$ 198,641	$ 206,158	$ (8,207)	$ 255,687	$ 454,328
Ending balance (in shares) at Sep. 30, 2017		30,468,249	38,462,541

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities
Net income (loss)	$ (20,177)	$ (289,235)
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization	68,456	75,518
Gain on disposal of property and equipment	(3,127)	(30)
Bad debt expense	1,098	1,679
Amortization of debt issuance costs	928	2,244
Equity-based compensation	1,781	317
Impairment of goodwill and other intangible assets		138,666
Impairment of property and equipment		60,026
Other operating items	(560)	(806)
Changes in operating assets and liabilities
Accounts receivable	(65,815)	15,339
Prepaid expenses and other assets	(6,493)	679
Accounts payable and accrued liabilities	19,660	3,681
Net cash (used in) provided by operating activities	(4,249)	8,078
Cash flows from investing activities
Acquisitions, net of cash received	(62,199)
Purchase of property and equipment	(66,013)	(28,630)
Proceeds received from sale of property and equipment	6,677	8,258
Net cash used in investing activities	(121,535)	(20,372)
Cash flows from financing activities
Proceeds from revolving line of credit	34,000	18,500
Payments on long-term debt	(34,000)	(36,334)
Payment of debt issuance costs		(2,775)
Proceeds from initial public offering	140,070
Payments incurred for initial public offering	(11,566)
Purchase of noncontrolling interests		(318)
Proceeds from (distributions to) noncontrolling interests	(368)	138
Member contributions		23,519
Net cash provided by financing activities	128,136	2,730
Net decrease in cash and cash equivalents	2,352	(9,564)
Cash and cash equivalents, beginning of period	40,041	16,305
Cash and cash equivalents, end of period	42,393	6,741
Supplemental cash flow disclosure:
Cash paid for interest	1,139	9,592
Cash paid for taxes	37	619
Supplemental disclosure of noncash investing activities:
Capital expenditures included in accounts payable and accrued liabilities	$ 7,733	$ 2,479

BUSINESS AND BASIS OF PRESENTAT

BUSINESS AND BASIS OF PRESENTATION	9 Months Ended
	Sep. 30, 2017
BUSINESS AND BASIS OF PRESENTATION
BUSINESS AND BASIS OF PRESENTATION	NOTE 1—BUSINESS AND BASIS OF PRESENTATION Description of the business : Select Energy Services, Inc. (“Select Energy Services” or “the Company”) was incorporated as a Delaware corporation on November 21, 2016. The Company is a holding company whose sole material asset consists of a membership interest in SES Holdings, LLC (“SES Holdings” or the “Predecessor”). Unless otherwise stated or the context otherwise indicates, all references to the “Company” or similar expressions for time periods prior to the reorganization and 144A Offering transactions refer to SES Holdings and its subsidiaries. For time periods subsequent to the reorganization and 144A Offering transactions, these terms refer to Select Energy Services and its subsidiaries. SES Holdings was formed in July 2008 and, in October 2008, members of Select Energy Services, LLC (“Select LLC”), formerly known as Peak Oilfield Services, LLC (“Peak”), a Delaware limited liability company formed in December 2006, transferred all interests in Select LLC to SES Holdings in exchange for membership interests in SES Holdings and Select LLC became a wholly owned subsidiary of SES Holdings. Select Energy Services is an oilfield services company that provides total water solutions to the U.S. conventional oil and natural gas industry. The Company offers water‑related services that support oil and gas well completion and production activities including sourcing, transfer, containment, monitoring, treatment, flowback, hauling and disposal in the U.S. shale basins. These services establish and maintain the flow of oil and natural gas throughout the productive life of a horizontal well. The Company also operates a wellsite services group to complement its total water solutions offering. These services include equipment rental, accommodations, crane and logistics services, wellsite and pipeline construction, and field services. The Company conducts its wellsite services activities on a third‑party contractual basis unrelated to its water‑related services. Reorganization : On December 20, 2016, Select Energy Services completed a private placement (the “144A Offering”) of 16,100,000 shares of Class A‑1 common stock, par value $0.01 per share (“Select Class A-1 Common Stock”) at an offering price of $20.00 per share. In conjunction with the 144A Offering, SES Holdings’ then existing Class A and Class B units were converted into a single class of common units (the “SES Holdings LLC Units”) and SES Holdings effected a 10.3583 for 1 unit split. In exchange for the contribution of all net proceeds from the 144A Offering to SES Holdings, SES Holdings issued 16,100,000 SES Holdings LLC Units to Select Energy Services, and Select Energy Services became the sole managing member of SES Holdings. Select Energy Services issued 38,462,541 shares of Class B common stock, par value $0.01 per share (“Select Class B Common Stock”) to the other member of SES Holdings, SES Legacy Holdings, LLC (“Legacy Owner Holdco”), or one share for each SES Holdings LLC Unit held by Legacy Owner Holdco. The Company also acquired 3,802,972 SES Holdings LLC Units from certain legacy owners (the “Contributing Legacy Owners”) in exchange for the issuance of 3,802,972 shares of Class A common stock, par value $0.01 per share (“Select Class A Common Stock”). Shareholders of Select Class A‑1 Common Stock, Select Class A Common Stock, and Select Class B Common Stock vote together as a single class on all matters, subject to certain exceptions in the Company’s amended and restated certificate of incorporation. Holders of Select Class B Common Stock have voting rights only and are not entitled to an economic interest in Select Energy Services based on their ownership of Select Class B Common Stock. The reorganization transactions were treated as a combination of entities under common control with assets and liabilities transferred at their carrying amounts in a manner similar to a pooling of interests. Initial Public Offering: On April 26, 2017, the Company completed its initial public offering (“IPO”) of 8,700,000 shares of Select Class A Common Stock at a price of $14.00 per share. On May 10, 2017, the underwriters of the IPO exercised their over-allotment option to purchase an additional 1,305,000 shares of Select Class A Common Stock at the IPO price of $14.00 per share. After deducting underwriting discounts and commissions and estimated offering expenses payable by it, the Company received approximately $128.5 million of the aggregate net proceeds from the IPO (including the over-allotment option). The Company contributed all of the net proceeds received by it to SES Holdings in exchange for SES Holdings LLC Units. SES Holdings used the net proceeds in the following manner: (i) $34.0 million was used to repay borrowings incurred under the Company’s Credit Facility to fund the cash portion of the purchase price of the GRR Acquisition, as defined below, (ii) $7.8 million was used for the cash settlement of outstanding phantom unit awards and (iii) the remaining net proceeds are intended to be used for general corporate purposes, including funding our 2017 budgeted capital expenditures. Credit Facility : Concurrent with the closing of the 144A Offering, the Company repaid all of its outstanding indebtedness and amended its Credit Facility to reduce the total commitment of its revolving line of credit to $100.0 million. See Note 7—Debt for further discussion. Exchange rights : Under the Eighth Amended and Restated Limited Liability Company Agreement of SES Holdings (the “SES Holdings LLC Agreement”), Legacy Owner Holdco has the right (an “Exchange Right”) to cause SES Holdings to acquire all or a portion of its SES Holdings LLC Units for, at SES Holdings’ election, (i) shares of Select Class A Common Stock at an exchange ratio of one share of Select Class A Common Stock for each SES Holdings LLC Unit exchanged, subject to conversion rate adjustments for stock splits, stock dividends, reclassification and other similar transactions or (ii) cash in an amount equal to the Cash Election Value (as defined within the SES Holdings LLC Agreement) of such Select Class A Common Stock. Alternatively, upon the exercise of any Exchange Right, the Company has the right (the “Call Right”) to acquire the tendered SES Holdings LLC Units from the exchanging unitholder for, at its election, (i) the number of shares of Select Class A Common Stock the exchanging unitholder would have received under the Exchange Right or (ii) cash in an amount equal to the Cash Election Value of such Select Class A Common Stock. In connection with any exchange of SES Holdings LLC Units pursuant to an Exchange Right or Call Right, the corresponding number of shares of Select Class B Common Stock will be cancelled. Registration rights : In December 2016, in connection with the closing of the 144A Offering, Select Energy Services entered into a registration rights agreement with FBR Capital Markets & Co. for the benefit of the investors in the 144A Offering. Under this registration rights agreement, the Company agreed, at its expense, to file with the SEC, in no event later than April 30, 2017, a shelf registration statement registering for resale the 16,100,000 shares of Select Class A Common Stock issuable upon conversion of the Select Class A‑1 Common Stock sold in the 144A Offering plus any additional shares of Class A‑1 common stock issued in respect thereof whether by stock dividend, stock distribution, stock split, or otherwise, and to use commercially reasonable efforts to cause such registration statement to be declared effective by the SEC as soon as practicable but in any event within 60 days after the closing of the IPO. The Company filed this registration statement with the SEC on April 28, and this registration statement was declared effective by the SEC on June 13, 2017. Accordingly, each share of Select Class A‑1 Common Stock outstanding automatically converted into a share of Select Class A Common Stock on a one‑for‑one basis at that time. In addition, Legacy Owner Holdco has the right, under certain circumstances, to cause the Company to register the shares of Select Class A Common Stock obtained pursuant to the Exchange Right. Tax receivable agreements : Concurrent with the closing of the 144A Offering, the Company entered into two tax receivable agreements with Legacy Owner Holdco and certain legacy owners of SES Holdings. On July 18, 2017, the Company’s board of directors approved amendments to each of the Tax Receivable Agreements. See Note 12—Related Party Transactions for further discussion. Basis of presentation : The accompanying unaudited interim consolidated financial statements of the Company have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and pursuant to the rules and regulations of the SEC. These unaudited interim consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and, therefore, do not include all disclosures required for financial statements prepared in conformity with GAAP. Accordingly, the accompanying unaudited interim consolidated financial statements and related notes should be read in conjunction with the Company’s consolidated financial statements for the years ended December 31, 2016 and 2015 included in the Final Prospectus. The consolidated financial statements include the accounts of Select Energy Services and all of its majority‑owned or controlled subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation. In the opinion of management, all adjustments which are of a normal recurring nature and considered necessary for a fair presentation of our interim financial statements have been included in these unaudited interim consolidated financial statements. Operating results for the nine months ended September 30, 2017 are not necessarily indicative of the results that may be expected for the fiscal year ending December 31, 2017. The Company’s historical financial statements prior to the 144A Offering and reorganization transactions are prepared using SES Holdings’ historical basis in the assets and liabilities, and include all revenues, costs, assets and liabilities attributed to SES Holdings. For investments in subsidiaries that are not wholly owned, but where the Company exercises control, the equity held by the minority owners and their portion of net income or loss are reflected as noncontrolling interests. Investments in entities in which Select Energy Services exercises significant influence over operating and financial policies are accounted for using the equity method, and investments in entities for which the Company does not have significant control or influence are accounted for using the cost method.

SIGNIFICANT ACCOUNTING POLICIES

SIGNIFICANT ACCOUNTING POLICIES	9 Months Ended
	Sep. 30, 2017
SIGNIFICANT ACCOUNTING POLICIES
SIGNIFICANT ACCOUNTING POLICIES	NOTE 2—SIGNIFICANT ACCOUNTING POLICIES Significant accounting policies : Our significant accounting policies are disclosed in Note 2 of the consolidated financial statements for the years ended December 31, 2016 and 2015 included in the Final Prospectus. There have been no changes in such policies or the application of such policies during the quarter ended September 30, 2017. Use of estimates : The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. On an ongoing basis, the Company evaluates its estimates, including those related to recoverability of long‑lived assets and intangibles, useful lives used in depreciation and amortization, uncollectible accounts receivable, income taxes, self‑insurance liabilities, share‑based compensation and contingent liabilities. The Company bases its estimates on historical and other pertinent information that are believed to be reasonable under the circumstances. The accounting estimates used in the preparation of the consolidated financial statements may change as new events occur, as more experience is acquired, as additional information is obtained and as the Company’s operating environment changes. Emerging Growth Company status: Under the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), we are an “emerging growth company,” or an “EGC,” which allows us to have an extended transition period for complying with new or revised accounting standards pursuant to Section 107(b) of the JOBS Act. We intend to take advantage of all of the reduced reporting requirements and exemptions, including the longer phase‑in periods for the adoption of new or revised financial accounting standards under Section 107 of the JOBS Act until we are no longer an emerging growth company. Our election to use the phase‑in periods permitted by this election may make it difficult to compare our financial statements to those of non‑emerging growth companies and other emerging growth companies that have opted out of the longer phase‑in periods under Section 107 of the JOBS Act and who will comply with new or revised financial accounting standards. If we were to subsequently elect instead to comply immediately with these public company effective dates, such election would be irrevocable pursuant to Section 107 of the JOBS Act. Recent accounting pronouncements : In May 2014, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers (Topic 606) , outlining a comprehensive new revenue recognition standard that will supersede ASC 605, Revenue Recognition. The new accounting guidance creates a framework under which an entity will allocate the transaction price to separate performance obligations and recognize revenue when each performance obligation is satisfied. Under the new standard, entities will be required to use judgment and make estimates, including identifying performance obligations in a contract, estimating the amount of variable consideration to include in the transaction price, allocating the transaction price to each separate performance obligation, and determining when an entity satisfies its performance obligations. The standard allows for either “full retrospective” adoption, meaning that the standard is applied to all of the periods presented with a cumulative catch‑up as of the earliest period presented, or “modified retrospective” adoption, meaning the standard is applied only to the most current period presented in the financial statements with a cumulative catch‑up as of the current period. In August 2015, the FASB decided to defer the original effective date by one year. As long as the Company is an EGC and able to utilize the extended transition period for new accounting pronouncements, this guidance will be effective for annual reporting periods beginning after December 15, 2018, and interim reporting periods within annual reporting periods beginning after December 15, 2019. The Company is still evaluating the impact that the new accounting guidance will have on its consolidated financial statements and related disclosures and has not yet determined the method by which it will adopt the standard. In November 2015, the FASB issued ASU 2015-17, Balance Sheet Classification of Deferred Taxes , which amends existing guidance on income taxes to require the classification of all deferred tax assets and liabilities as noncurrent on the balance sheet. As an EGC utilizing the extended transition period for new accounting pronouncements, this pronouncement is effective for annual reporting periods beginning after December 15, 2017, and interim periods within annual periods beginning after December 15, 2018, and may be applied either prospectively or retrospectively. The Company prospectively adopted this guidance during the nine months ended September 30, 2017. Prior periods were not retrospectively adjusted. As the Company’s deferred tax assets and liabilities are all noncurrent, the adoption did not result in a change to the consolidated financial statements and related disclosures. In February 2016, the FASB issued ASU 2016-02, Leases , which introduces a lessee model that brings most leases on the balance sheet. The new standard also aligns many of the underlying principles of the new lessor model with those in the current accounting guidance as well as the FASB’s new revenue recognition standard. However, the ASU eliminates the use of bright‑line tests in determining lease classification as required in the current guidance. The ASU also requires additional qualitative disclosures along with specific quantitative disclosures to better enable users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. As an EGC utilizing the extended transition period for new accounting pronouncements, this pronouncement is effective for annual reporting periods beginning after December 15, 2019, and interim periods within fiscal years beginning after December 15, 2020, using a modified retrospective approach. Early adoption is permitted. The Company is still evaluating the impact that the new accounting guidance will have on its consolidated financial statements and related disclosures. In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting , that provides a new requirement to record all of the tax effects related to share‑based payments at settlement (or expiration) through the income statement. As an EGC utilizing the extended transition period for new accounting pronouncements, this pronouncement is effective for annual reporting periods beginning after December 15, 2017, and interim periods within fiscal years beginning after December 15, 2018. The Company is still evaluating the impact that the new accounting guidance will have on its consolidated financial statements and related disclosures. In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments, which addresses the classification and presentation of eight specific cash flow issues that currently result in diverse practices. The amendments provide guidance in the presentation and classification of certain cash receipts and cash payments in the statement of cash flows including debt prepayment or debt extinguishment costs, settlement of zero‑coupon debt instruments, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate‑owned life insurance policies, and distributions received from equity method investees. As an EGC utilizing the extended transition period for new accounting pronouncements, this pronouncement is effective for annual reporting periods beginning after December 15, 2018, and interim periods within fiscal years beginning after December 15, 2019. The amendments in this ASU should be applied using a retrospective approach. The Company is still evaluating the impact that the new accounting guidance will have on its consolidated financial statements and related disclosures. In January 2017, the FASB issued ASU 2017-01 , Clarifying the Definition of a Business , with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. As an EGC utilizing the extended transition period for new accounting pronouncements, this pronouncement is effective for annual reporting periods beginning after December 15, 2018, and interim periods within fiscal years beginning after December 15, 2019. The amendments in this ASU should be applied prospectively. The Company is still evaluating the impact that the new accounting guidance will have on its consolidated financial statements and related disclosures. In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment . This pronouncement removes Step 2 of the goodwill impairment test, which requires a hypothetical purchase price allocation. A goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. This pronouncement is effective for annual reporting periods beginning after December 15, 2019, and interim periods within fiscal years beginning after December 15, 2019. The amendments in this ASU should be applied prospectively. The Company is still evaluating the impact that the new accounting guidance will have on its consolidated financial statements and related disclosures. In May 2017, the FASB issued ASU 2017-09, Scope of Modification Accounting . This pronouncement provides guidance about which changes to the terms and conditions of a share-based payment award require an entity to apply modification accounting in ASC 718. This pronouncement is effective for annual reporting periods beginning after December 15, 2017, and interim periods within fiscal years beginning after December 15, 2017. Early adoption is permitted, including adoption in any interim period. The pronouncement should be applied prospectively to an award modified on or after the adoption date. The Company is still evaluating the impact that the new accounting guidance will have on its consolidated financial statements and related disclosures.

ACQUISITIONS

ACQUISITIONS	9 Months Ended
	Sep. 30, 2017
ACQUISITIONS
ACQUISITIONS	NOTE 3— ACQUISITIONS Business combinations On September 15, 2017, the Company completed its acquisition (the “Resource Water Acquisition”) of Resource Water Transfer Services, L.P. and certain other affiliated assets (collectively, “Resource Water”). Resource Water provides water transfer services to exploration and production (“E&P”) operators in West Texas and East Texas. Resource Water’s assets include 24 miles of layflat hose as well as numerous pumps and ancillary equipment required to support water transfer operations. Resource Water has longstanding customer relationships across its operating regions which are viewed as strategic to the Company’s water solutions business. The total consideration for the Resource Water Acquisition was $9.1 million, with $6.7 million paid in cash and $2.4 million paid in shares of Select Class A Common Stock valued at $15.17 per share, subject to customary post‑closing adjustments. The Company funded the cash portion of the consideration for the Resource Water Acquisition with $6.7 million of cash on hand. For the nine months ended September 30, 2017, the Company expensed less than $0.1 million of related transaction-related costs. The Resource Water Acquisition is being accounted for as a business combination under the acquisition method of accounting. The preliminary allocation of the consideration transferred is based on management’s estimates, judgments and assumptions. When determining the fair values of assets acquired and liabilities assumed, management made significant estimates, judgments, and assumptions. These estimates, judgments and assumptions are subject to change upon final valuation and should be treated as preliminary values. Working capital estimates are based on provisional amounts. Management estimated that total consideration paid exceeded the fair value of the net assets acquired by $1.8 million, which excess was recognized as goodwill. The goodwill recognized was attributable to Resource Water’s assembled workforce as well as synergies related to the Company’s comprehensive water solutions strategy. The goodwill was included in the assets of the Company’s Water Solutions segment. The following table summarizes the consideration transferred and the estimated fair value of identified assets acquired and liabilities assumed at the date of acquisition: Preliminary purchase price allocation Amount Consideration transferred (in thousand) Cash paid $ 6,692 Class A common stock issued 2,380 Total consideration transferred 9,072 Less: identified assets Working capital 1,396 Fixed assets 3,485 Customer relationship intangible assets 1,912 Other intangible assets 466 Total identified assets 7,259 Goodwill $ 1,813 On March 10, 2017, the Company completed its acquisition (the “GRR Acquisition”) of Gregory Rockhouse Ranch, Inc. and certain other affiliated entities and assets (collectively, the “GRR Entities”). The GRR Entities provide water and water‑related services to E&P companies in the Permian Basin and own and have rights to a vast array of fresh, brackish and effluent water sources with access to significant volumes of water annually and water transport infrastructure, including over 900 miles of temporary and permanent pipeline infrastructure and related storage facilities and pumps, all located in the northern Delaware Basin portion of the Permian Basin. The total consideration for the GRR Acquisition was $56.8 million, with $51.3 million paid in cash and $5.5 million paid in shares of Select Class A Common Stock valued at $20.00 per share, subject to customary post‑closing adjustments. The Company funded the cash portion of the consideration for the GRR Acquisition with $17.3 million of cash on hand and $34.0 million of borrowings under the Company’s Credit Facility. For the nine months ended September 30, 2017, the Company expensed $1.0 million of transaction-related costs. The GRR Acquisition is being accounted for as a business combination under the acquisition method of accounting. When determining the fair values of assets acquired and liabilities assumed, management made significant estimates, judgments and assumptions. Management estimated that consideration paid exceeded the fair value of the net assets acquired. Therefore, goodwill of $11.0 million was recorded. The goodwill recognized is primarily attributable to synergies related to the Company’s comprehensive water solutions strategy that are expected to arise from the GRR Acquisition and is attributable to the Company’s Water Solutions segment. The assets acquired and liabilities assumed and the results of operations of the acquired business are included in the Company’s Water Solutions segment. The following table summarizes the consideration transferred and the estimated fair value of identified assets acquired and liabilities assumed at the date of acquisition: Preliminary purchase price allocation Amount Consideration transferred (in thousand) Cash paid $ 51,303 Class A common stock issued 5,500 Total consideration transferred 56,803 Less: identified assets Working capital 6,000 Fixed assets 13,225 Customer relationship intangible assets 21,392 Other intangible assets 5,150 Total identified assets 45,767 Goodwill $ 11,036 Resource Water Acquisition contributed revenue and net income of $0.2 million and less than $0.1 million, respectively, to the results of the Company from the date of acquisition through September 30, 2017. The GRR Acquisition contributed revenue and net income of $21.5 million and $1.9 million, respectively, to the consolidated results of the Company from the date of acquisition through September 30, 2017. The following unaudited consolidated pro forma information is presented as if the GRR Acquisition and Resource Water Acquisition had occurred on January 1, 2016: Pro Forma Pro Forma Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 (unaudited) (unaudited) (in thousands) (in thousands) Revenue $ 156,045 $ 82,824 $ 400,948 $ 237,644 Net income (loss) $ 3,195 $ (34,344) $ (17,951) $ (289,130) Less: net (income) loss attributable to noncontrolling interests 1 (1,706) 19,284 11,682 163,044 Net income (loss) attributable to Select Energy Services, Inc. 1 $ 1,489 $ (15,060) $ (6,269) $ (126,086) 1 The allocation of net loss attributable to noncontrolling interests and Select Energy Services gives effect to the equity structure as of September 30, 2017 as though the 144A Offering, the IPO, the Resource Water Acquisition, the GRR Acquisition and other equity transactions occurred as of January 1, 2016. However, the calculation of pro forma net loss does not give effect to any other pro forma adjustments for the 144A Offering or the subsequent IPO. The unaudited pro forma amounts above have been calculated after applying the Company’s accounting policies and adjusting the GRR Acquisition and Resource Water Acquisition results to reflect the increase to depreciation and amortization that would have been charged assuming the fair value adjustments to property, plant and equipment and intangible assets had been applied from January 1, 2016 and other related pro forma adjustments. The pro forma amounts do not include any potential synergies, cost savings or other expected benefits of the GRR Acquisition or Resource Water Acquisition, and are presented for illustrative purposes only and are not necessarily indicative of results that would have been achieved if the GRR Acquisition and Resource Water Acquisition had occurred as of January 1, 2016 or of future operating performance. Asset acquisitions On June 21, 2017 the Company completed the acquisition of fixed assets from Tex-Star Water Services, LLC (the “TEX Acquisition”) for $4.2 million in cash, funded entirely with cash on hand. On May 30, 2017 the Company completed the acquisition of automated manifold intellectual property and related assets from Data Automated Water Systems, LLC (the “DAWS Acquisition”) for $4.0 million. This acquisition was paid with $2.0 million of cash and 128,370 shares of Select Class A Common Stock valued at approximately $2.0 million. The DAWS Acquisition resulted in fixed assets of $1.8 million, patents of $1.9 million and software of $0.3 million.

EXIT AND DISPOSAL ACTIVITIES

EXIT AND DISPOSAL ACTIVITIES	9 Months Ended
	Sep. 30, 2017
EXIT AND DISPOSAL ACTIVITIES
EXIT AND DISPOSAL ACTIVITIES	NOTE 4—EXIT AND DISPOSAL ACTIVITIES Due to a reduction in industry activity from 2014, the Company made the decision during the year ended December 31, 2016 to close 15 facilities and consolidate operations for the purpose of improving operating efficiencies. The Company recorded $2.9 million of charges related to exit and disposal activities and reclassified $0.2 million of deferred rent related to accrued lease obligations related to exited facilities during the nine months ended September 30, 2017. The Company had a remaining balance of $20.0 million, inclusive of a short‑term balance of $1.9 million in accrued expenses and other current liabilities, as of September 30, 2017 related to accrued lease obligations and terminations at exited facilities within its Water Solutions segment. As of September 30, 2017, the Company has completed its exit from underperforming facilities but will continue to make non‑cancelable lease payments for related facilities through the year ended 2027. The Company’s abandonment of these facilities is not a part of a formalized exit plan. Provision during the Usage during the Balance as of nine months ended nine months ended Balance as of December 31, 2016 September 30, 2017 September 30, 2017 September 30, 2017 (in thousands) Lease obligations and terminations $ 18,000 $ 2,871 $ 2,153 $ 18,718 Reclassification of deferred rent 1,069 1,254 Total $ 19,069 $ 19,972

PROPERTY AND EQUIPMENT

PROPERTY AND EQUIPMENT	9 Months Ended
	Sep. 30, 2017
PROPERTY AND EQUIPMENT.
PROPERTY AND EQUIPMENT	NOTE 5—PROPERTY AND EQUIPMENT Property and equipment consists of the following as of September 30, 2017 and December 31, 2016: September 30, 2017 December 31, 2016 (in thousands) Land $ 7,106 $ 8,593 Buildings and leasehold improvements 83,328 83,352 Vehicles and equipment 38,547 24,114 Machinery and equipment 564,741 534,303 Computer equipment and software 11,438 11,102 Office furniture and equipment 3,709 4,275 Disposal wells 67,778 67,566 Helicopters 497 497 Construction in progress 37,858 5,584 815,002 739,386 Less accumulated depreciation and impairment (535,456) (490,519) Total property and equipment, net $ 279,546 $ 248,867 Long‑lived assets are evaluated for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. The Company had no capital lease obligations as of September 30, 2017 and December 31, 2016.

GOODWILL AND OTHER INTANGIBLE A

GOODWILL AND OTHER INTANGIBLE ASSETS	9 Months Ended
	Sep. 30, 2017
GOODWILL AND OTHER INTANGIBLE ASSETS
GOODWILL AND OTHER INTANGIBLE ASSETS	NOTE 6—GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill is evaluated for impairment on at least an annual basis as of December 31, or more frequently if indicators of impairment exist. The annual impairment tests are based on Level 3 inputs. The changes in the carrying amounts of goodwill by reportable segment for the nine months ended September 30, 2017 and the year ended December 31, 2016 are as follows: Wellsite Completion Water and Construction Accommodations Solutions Services and Rentals Total (in thousands) Balance as of December 31, 2015 $ 137,534 $ 12,242 $ 995 $ 150,771 Impairment (137,534) — (995) (138,529) Balance as of December 31, 2016 — 12,242 — 12,242 Additions 12,849 — — 12,849 Balance as of September 30, 2017 $ 12,849 $ 12,242 $ — $ 25,091 The components of other intangible assets are as follows: September 30, 2017 Gross Accumulated Net Value Amortization Value (in thousands) Customer relationships $ 80,131 $ 54,987 $ 25,144 Other 13,222 3,015 10,207 Total other intangible assets $ 93,353 $ 58,002 $ 35,351 December 31, 2016 Gross Accumulated Net Value Amortization Value (in thousands) Customer relationships $ 56,826 $ 48,236 $ 8,590 Other 5,491 2,495 2,996 Total other intangible assets $ 62,317 $ 50,731 $ 11,586 Intangibles obtained through acquisitions are initially recorded at estimated fair value based on preliminary information that is subject to change until final valuations are obtained. Customer relationships and non‑compete agreements are being amortized over estimated useful lives ranging from five to seven years and three to five years, respectively. Other intangible assets primarily relate to certain water rights that are amortized over estimated useful lives ranging from three to eight years. Intangible assets obtained in the GRR Acquisition consisted of customer relationships and non-compete agreements that will be amortized over estimated useful lives of thirteen and five years, respectively, with a weighted-average estimated useful life of 12.5 years. As a result of the GRR Acquisition, the Company also obtained water rights totaling $3.7 million that have indefinite lives and will be evaluated periodically for impairment. Intangible assets obtained in the Resource Water Acquisition consisted of customer relationships and non-compete agreements that will be amortized over estimated useful lives of ten and three years, respectively, with a weighted-average estimated useful life of 8.6 years. The Company acquired patents of $1.9 million as part of the DAWS Acquisition, which are being amortized over the estimated useful lives of ten years. See Note 3 – Acquisitions for further discussion. Amortization expense was $2.6 million and $2.1 million for the three months ended September 30, 2017 and 2016, respectively, and $7.3 million and $6.7 million for the nine months ended September 30, 2017 and 2016, respectively.

DEBT

DEBT	9 Months Ended
	Sep. 30, 2017
DEBT
DEBT	NOTE 7—DEBT Credit Facility term loans and revolving line of credit Select Energy Services’ Credit Facility, originally executed in May 2011, has been amended over time. Effective December 20, 2016, the Company amended its Credit Facility to extend the maturity date from February 28, 2018 to February 28, 2020 and reduce the revolving line of credit to $100.0 million. The agreement also amended certain financial covenants and restrictions and outlined a new pricing grid that is effective after receipt of the third quarter 2017 compliance certificate. Accrued interest is payable at the end of each quarter. The Credit Facility has a variable interest rate that ranges from either (i) the London interbank rate (“LIBOR”) plus a margin for Eurodollar advances or (ii) the applicable base rate plus a margin for base rate advances based on the Company’s Leverage Ratio (as defined in the Credit Facility) falling between 2.00% and 4.00% as outlined below. In addition, a commitment fee related to the revolving line of credit is payable at the end of each calendar quarter based on a rate of 0.500% per annum on any unused portion of the commitment under the Credit Facility. Effective June 13, 2017, the Company amended its Credit Facility to permanently waive the default associated with the DAWS Acquisition. This waiver is specifically for such acquisition and does not remedy any other present or future defaults associated with the Credit Facility. Leverage Ratio Before Receipt of Fourth Quarter 2017 Eurodollar Base Rate Compliance Certificate Advances Advances < 4.00 4.00 % 3.00 % ≥ 4.00 4.50 % 3.50 % Leverage Ratio After Receipt of Fouth Quarter 2017 Eurodollar Base Rate Compliance Certificate Advances Advances < 2.00 3.00 % 2.00 % ≥ 2.00 < 2.50 3.25 % 2.25 % ≥ 2.50 < 3.00 3.50 % 2.50 % ≥ 3.00 < 3.50 3.75 % 2.75 % ≥ 3.50 < 4.00 4.00 % 3.00 % ≥ 4.00 4.50 % 3.50 % Select Energy Services had no debt outstanding under the revolving line of credit as of September 30, 2017 and December 31, 2016. The borrowing capacity under the revolving line of credit was reduced by outstanding letters of credit of $14.1 million as of September 30, 2017. The Company’s letters of credit have a variable interest rate between 3.00% and 4.50% based on the Company’s Leverage Ratio as outlined above. The unused portion of the available borrowings under the revolving line of credit was $85.9 million at September 30, 2017. Debt issuance costs are amortized to interest expense over the life of the debt to which they pertain. Total unamortized debt issuance costs as of September 30, 2017 were $3.0 million. As these debt issuance costs relate to a revolving line of credit, they are presented as a deferred charge within other assets on the consolidated balance sheet. The Company’s obligations under its Credit Facility are secured by substantially all of its assets. The Credit Facility contains customary events of default and covenants and limits its ability to incur additional indebtedness, pay dividends or make other distributions, create liens and sell assets. The Company was in compliance with all debt covenants as of September 30, 2017.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	9 Months Ended
	Sep. 30, 2017
COMMITMENTS AND CONTINGENCIES.
COMMITMENTS AND CONTINGENCIES	NOTE 8—COMMITMENTS AND CONTINGENCIES Litigation The Company is named from time to time in various legal proceedings in the ordinary course of business. The legal proceedings are at different stages; however, the Company does not believe the resolution of any of these proceedings would be material to its financial position or results of operations. General Business Risk As discussed in Note 1, the substantial majority of the Company’s customers are in the oil and gas industry. The oil and gas industry is currently facing unique challenges due to the continued volatility and depressed state of oil and gas prices.

EQUITY_BASED COMPENSATION

EQUITY‑BASED COMPENSATION	9 Months Ended
	Sep. 30, 2017
EQUITY BASED COMPENSATION
EQUITY‑BASED COMPENSATION	NOTE 9—EQUITY‑BASED COMPENSATION The SES Holdings 2011 Equity Incentive Plan, (“2011 Plan”) was approved by the Predecessor’s board of managers in April 2011. In conjunction with the 144A Offering, the Company adopted the Select Energy Services, Inc. 2016 Equity Incentive Plan (as amended from time to time, the “2016 Plan”) for employees, consultants and directors of the Company and its affiliates. Options that were outstanding under the 2011 Plan immediately prior to the 144A Offering were cancelled in exchange for new options granted under the 2016 Plan. On July 18, 2017, the Select Energy Services board of directors approved the First Amendment to the 2016 Plan (the “Equity Plan Amendment”), which clarifies the treatment of substitute awards under the 2016 Plan (including substitute awards that may be granted in connection with the Merger (as defined in Note 17 below)) and allows for the assumption by the Company of shares eligible under any pre-existing stockholder-approved plan of an entity acquired by the Company or its affiliate (including the Rockwater Energy Solutions Inc. Amended and Restated 2017 Long Term Incentive Plan (the “Rockwater Equity Plan”)), in each case subject to the listing rules of the stock exchange on which Select Class A Common Stock is listed. The effectiveness of the Equity Plan Amendment was subject to approval by the Company's stockholders and the consummation of the transactions contemplated by the Merger Agreement (as defined in Note 17 below). The Company’s consenting stockholders, who hold a majority of the outstanding common stock of Select Energy Services, approved the Equity Plan Amendment on July 18, 2017. The Equity Plan Amendment became effective on November 1, 2017 upon the consummation of the Merger. The maximum number of shares initially reserved for issuance under the 2016 Plan was 5,400,400 shares of Select Class A Common Stock, subject to adjustment in the event of recapitalization or reorganization, or related to forfeitures or the expiration of awards. Stock options are granted with terms not to exceed ten years. After giving effect to the Equity Plan Amendment, the maximum number of shares of Select Class A Common Stock reserved for issuance under the 2016 Plan is equal to (i) 5,400,400 shares plus (ii) 1,011,087 shares that became available on account of the assumption of the Rockwater Equity Plan, subject to adjustment in the event of recapitalization or reorganization, or related to forfeitures or the expiration of awards. The maximum number of shares described in the preceding sentence does not take into account 2,887,048 shares of Select Class A Common Stock related to substitute awards that were granted under the 2016 Plan following the conversion of outstanding equity awards originally granted under the Rockwater Equity Plan in accordance with the Merger Agreement. For additional information on such substitute awards, please see Note 17 below. Phantom unit awards granted under the 2011 Plan, upon vesting, entitled each participant with the right to receive an amount of cash based in part on the fair market value of a share of Select Class A Common Stock on the date of the IPO. Based on the fair market value of a share of Select Class A Common Stock of $14.00 on the date of the IPO, each participant received a cash payment equal to $5.53 for each phantom unit on May 5, 2017. Refer to “Phantom Unit Awards” for details related to the payments made in respect of outstanding phantom units in connection with the IPO. Stock option awards Stock options were granted with an exercise price equal to or greater than the fair market value of a share of Select Class A Common Stock as of the date of grant. The Company historically valued Select Class A Common Stock on a quarterly basis using a market approach that includes a comparison to publicly traded peer companies using earnings multiples based on their market values and a discount for lack of marketability. The fair value measurement relies on Level 3 inputs. The estimated fair value of its stock options is expensed over their vesting period, which is generally three years from the applicable date of grant. However, certain awards that were granted during 2016 in exchange for cancelled awards were immediately vested and fully exercisable on the date of grant because they were granted in exchange for the cancellation of outstanding options granted under the 2011 Plan that were fully vested and exercisable prior to such cancellation. The Company utilizes the Black‑Scholes model to determine fair value, which incorporates assumptions to value equity‑based awards. The risk‑free interest rate is based on the U.S. Treasury yield curve in effect for the expected term of the option at the time of grant. At the time of grant, there was no public market for the Company’s equity. Therefore, the Company considered the historic volatility of publicly traded peer companies when determining the volatility factor. The expected life of the options was based on a formula considering the vesting period and term of the options awarded, which is generally seven to ten years. A summary of the Company’s stock option activity and related information for the nine months ended September 30, 2017 is as follows: For the nine months ended September 30, 2017 Weighted-average Equity Options Exercise Price Beginning balance 620,721 $ 16.50 Granted 455,130 20.00 Forfeited (98,499) 20.00 Ending balance 977,352 $ 17.78 The weighted‑average grant date fair value of stock options granted during the nine months ended September 30, 2017 was $7.85. The relevant assumptions for stock options granted during the period are as follows: $20.00 Strike Underlying Equity $ 20.00 Strike Price $ 20.00 Dividend Yield (%) % Risk free rate (%) 1.68 - 2.00 % Volatility (%) 46.6 - 46.8 % Expected Term (Years) 4-6 There was no vested stock option activity, or exercise of vested stock options, during the nine months ended September 30, 2017. A summary of the Company’s restricted stock unit activity and related information for the nine months ended September 30, 2017 is as follows: For the nine months ended September 30, 2017 Weighted-average Restricted Stock Grant Date Fair Value Beginning balance — $ — Granted 41,117 19.91 Forfeited (10,757) 20.00 Ending balance 30,360 $ 19.88 The Company recognized approximately $0.6 million and $0.0 million of compensation expense related to stock options and restricted stock unit awards during the three months ended September 30, 2017 and 2016, respectively. The Company recognized approximately $1. 8 million and $0.3 million of compensation expense related to stock options and restricted stock unit awards during the nine months ended September 30, 2017 and 2016, respectively. Phantom unit awards The Company’s phantom unit awards were cash settled awards that were contingent upon meeting certain equity returns and a liquidation event. The settlement amount was based on the fair market value of a share of Select Class A Common Stock on the date of completion of the IPO, which constituted a liquidation event with respect to such phantom unit awards. As a result of the cash‑settlement feature of these awards, the Company considered these awards to be liability awards, which are measured at fair value at each reporting date and the pro rata vested portion of the award is recognized as a liability to the extent that the performance condition is deemed probable. On May 5, 2017, the Company settled its outstanding phantom unit awards for an aggregate amount equal to $7.8 million as a result of the completion of its IPO, which constituted a liquidity event with respect to such phantom unit awards. Based on the fair market value of a share of Select Class A Common Stock on the date of the IPO of $14.00, the cash payment with respect to each phantom unit was approximately $5.53, before employer taxes. The Company recognized compensation expense of $7.8 million during the nine months ended September 30, 2017 related to the settlement of its phantom unit awards. As of September 30, 2017 there are no phantom units outstanding.

DERIVATIVE FINANCIAL INSTRUMENT

DERIVATIVE FINANCIAL INSTRUMENTS	9 Months Ended
	Sep. 30, 2017
DERIVATIVE FINANCIAL INSTRUMENTS
DERIVATIVE FINANCIAL INSTRUMENTS	NOTE 10—DERIVATIVE FINANCIAL INSTRUMENTS The Company had variable rate debt outstanding which was subject to interest rate risk based on volatility in underlying interest rates. In April 2013, the Company entered into a pay fixed, receive variable interest rate swap, with an aggregate notional amount of $125.0 million, which the Company designated as a cash flow hedge. The derivative contract matured in April 2016. The change in value and amounts reclassified to interest expense during the nine months ended September 30, 2016 were nominal. There was no activity during the nine months ended September 30, 2017. Changes in the fair values of the Company’s derivative instruments are presented on a net basis in the accompanying consolidated statements of operations. Changes in the fair value of the Company’s interest rate swap derivative instruments are as follows: For the Nine Months Ended Derivatives designated as cash flow hedges September 30, 2016 (in thousands) Beginning fair value of interest rate swap derivative instruments $ (7) Amount of unrealized losses recognized in OCI (106) Amount of gains reclassified from AOCI to earnings (effective portion) 113 Net change in fair value of interest rate swap derivative instruments 7 Ending fair value of interest rate swap derivative instruments $ —

FAIR VALUE MEASUREMENT

FAIR VALUE MEASUREMENT	9 Months Ended
	Sep. 30, 2017
FAIR VALUE MEASUREMENT
FAIR VALUE MEASUREMENT	NOTE 11—FAIR VALUE MEASUREMENT The Company utilizes fair value measurements to measure assets and liabilities in a business combination or assess impairment of property and equipment, intangible assets and goodwill. Fair value is defined as the amount at which an asset (or liability) could be bought (or incurred) or sold (or settled) in an orderly transaction between market participants at the measurement date. Further, ASC 820, Fair Value Measurements, establishes a framework for measuring fair value, establishes a fair value hierarchy based on the quality of inputs used to measure fair value, and includes certain disclosure requirements. Fair value estimates are based on either (i) actual market data or (ii) assumptions that other market participants would use in pricing an asset or liability, including estimates of risk. ASC 820 establishes a three‑level valuation hierarchy for disclosure of fair value measurements. The valuation hierarchy categorizes assets and liabilities measured at fair value into one of three different levels depending on the observability of the inputs employed in the measurement. The three levels are defined as follows: Level 1 —Unadjusted quoted prices for identical assets or liabilities in active markets. Level 2 —Quoted prices for similar assets or liabilities in non‑active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument. Level 3 —Inputs that are unobservable and significant to the fair value measurement (including the Company’s own assumptions in determining fair value). A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. There were no transfers into, or out of, the three levels of the fair value hierarchy for the nine months ended September 30, 2017 or the year ended December 31, 2016. Other fair value considerations The carrying values of the Company’s current financial instruments, which include cash and cash equivalents, accounts receivable trade and accounts payable, approximate their fair value at September 30, 2017 and December 31, 2016 due to the short‑term maturity of these instruments. The Company had no outstanding debt as of September 30, 2017 and December 31, 2016. The estimated fair values of the Company’s financial instruments are not necessarily indicative of the amounts that would be realized in a current market exchange. The consideration transferred and the purchase price allocation of identified assets acquired and liabilities assumed related to the GRR Acquisition and Resource Water Acquisition are based on the Company’s estimate of fair value utilizing Level 3 inputs at the date of acquisition. Refer to Note 3 – Acquisitions for further discussion.

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS	9 Months Ended
	Sep. 30, 2017
RELATED PARTY TRANSACTIONS
RELATED PARTY TRANSACTIONS	NOTE 12—RELATED PARTY TRANSACTIONS The Company considers its related parties to be those stockholders who are beneficial owners of more than 5.0% of its common stock, executive officers, members of its board of directors or immediate family members of any of the foregoing persons. The Company has entered into a significant number of transactions with related parties. The Company’s board of directors regularly reviews these transactions; however, the Company’s results of operations may have been different if these transactions were conducted with non‑related parties. During the three months ended September 30, 2017, sales to related parties were $0.4 million and purchases from related party vendors were $2.1 million. These purchases comprised $0.7 million relating to purchases of property and equipment, less than $0.1 million relating to inventory and consumables, $0.8 million relating to rent of certain equipment or other services used in operations, and $0.5 million relating to management, consulting and other services. During the three months ended September 30, 2016, sales to related parties were $0.2 million and purchases from related party vendors were $0.9 million. These purchases comprised $0.4 million relating to purchases of property and equipment, less than $0.1 million relating to inventory and consumables, less than $0.1 million relating to rent of certain equipment or other services used in operations, and $0.4 million relating to management, consulting and other services. During the nine months ended September 30, 2017, sales to related parties were $1.5 million and purchases from related party vendors were $5.0 million. These purchases comprised $1.4 million relating to purchases of property and equipment, $0.2 million relating to inventory and consumables, $1.7 million relating to rent of certain equipment or other services used in operations, and $1.7 million relating to management, consulting and other services. During the nine months ended September 30, 2016, sales to related parties were $0.8 million and purchases from related party vendors were $2.6 million. These purchases comprised $0.6 million relating to purchases of property and equipment, $0.1 million relating to inventory and consumables, $0.4 million relating to rent of certain equipment or other services used in operations, and $1.5 million relating to management, consulting and other services. Tax receivable agreements In connection with the 144A Offering, the Company entered into two tax receivable agreements (the “Tax Receivable Agreements”) with Legacy Owner Holdco, Crestview Partners II GP, L.P. (“Crestview GP”), and certain affiliates of Predecessor unitholders (collectively, the “TRA Holders”). The first of the Tax Receivable Agreements, which the Company entered into with Legacy Owner Holdco and Crestview GP, generally provides for the payment by the Company to such TRA Holders of 85% of the net cash savings, if any, in U.S. federal, state and local income and franchise tax that the Company actually realizes (computed using simplifying assumptions to address the impact of state and local taxes) or is deemed to realize in certain circumstances in periods after the 144A Offering as a result of, as applicable to each such TRA Holder, (i) certain increases in tax basis that occur as a result of the Company’s acquisition (or deemed acquisition for U.S. federal income tax purposes) of all or a portion of such TRA Holder’s SES Holdings LLC Units in connection with the 144A Offering or pursuant to the exercise of the Exchange Right or the Company’s Call Right and (ii) imputed interest deemed to be paid by the Company as a result of, and additional tax basis arising from, any payments the Company makes under such Tax Receivable Agreement. The second of the Tax Receivable Agreements, which the Company entered into with an affiliate of the Contributing Legacy Owners and Crestview GP, generally provides for the payment by the Company to such TRA Holders of 85% of the net cash savings, if any, in U.S. federal, state and local income and franchise tax that the Company actually realizes (computed using simplifying assumptions to address the impact of state and local taxes) or is deemed to realize in certain circumstances in periods after the 144A Offering as a result of, as applicable to each such TRA Holder, (i) any net operating losses available to the Company as a result of certain reorganization transactions entered into in connection with the 144A Offering and (ii) imputed interest deemed to be paid by the Company as a result of any payments the Company makes under such Tax Receivable Agreement. On July 18, 2017, the Company’s board of directors approved amendments to each of the Tax Receivable Agreements revising the definition of a “change of control” for purposes of the Tax Receivable Agreements and acknowledging that the Merger would not result in such a change of control.

INCOME TAXES

INCOME TAXES	9 Months Ended
	Sep. 30, 2017
INCOME TAXES
INCOME TAXES	NOTE 13—INCOME TAXES The Company is subject to U.S. federal and state income taxes as a corporation. SES Holdings and its subsidiaries, with the exception of certain corporate subsidiaries, are treated as flow‑through entities for U.S. federal income tax purposes, and as such, are generally not subject to U.S. federal income tax at the entity level. Rather, the tax liability with respect to their taxable income is passed through to their members or partners. Accordingly, prior to our reorganization in connection with the 144A Offering, the Predecessor only recorded a provision for Texas franchise tax and U.S. federal and state provisions for certain corporate subsidiaries as the Predecessor’s taxable income or loss was includable in the income tax returns of the individual partners and members. However, for periods following our reorganization in connection with the 144A Offering, Select Energy Services recognizes a tax liability on its allocable share of SES Holdings’ taxable income. The Company’s effective tax rates for the three months ended September 30, 2017 and 2016 were (12.8)% and 0.1%, respectively. The Company’s effective tax rates for the nine months ended September 30, 2017 and 2016 were (1.6)% and 0.1%, respectively. The effective tax rates for the three and nine months ended September 30, 2017 differ from the statutory rate of 35% due to net income allocated to noncontrolling interests, state income taxes, other permanent differences between book and tax accounting, and valuation allowances. The Company recorded income tax expense (benefit) of $(0.3) million and less than $0.1 million for the three months ended September 30, 2017 and 2016 , respectively. The Company recorded income tax expense (benefit) of $(0.3) million and $0.4 million for the nine months ended September 30, 2017 and 2016, respectively. The tax benefits of deferred tax assets are recorded as an asset to the extent that management assesses the utilization of such assets to be more likely than not. When the future utilization of some portion of deferred tax assets is determined not to be more likely than not, a valuation allowance is provided to reduce the recorded tax benefits from such assets. As of September 30, 2017, management’s assessment as to the realizability of certain deferred tax assets has resulted in the recording of a valuation allowance to reduce deferred tax assets to the amounts that are considered more likely than not to be realized. Management believes there will be sufficient future taxable income based on the reversal of temporary differences to enable utilization or sustainability of those deferred tax assets that do not have a valuation allowance recorded against them. Separate federal and state income tax returns are filed for Select Energy Services, SES Holdings, and certain consolidated affiliates. The tax years 2013 through 2016 remain open to examination by the major taxing jurisdictions to which the Company is subject to income tax. Select Energy Services and SES Holdings are not currently under any income tax audits. Accounting for uncertainty in income taxes prescribes a recognition threshold and measurement methodology for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. As of September 30, 2017 and December 31, 2016, there was no material liability or expense for the periods then ended recorded for payments of interest and penalties associated with uncertain tax positions or material unrecognized tax positions and the Company’s unrecognized tax benefits were not material.

NONCONTROLLING INTERESTS

NONCONTROLLING INTERESTS	9 Months Ended
	Sep. 30, 2017
NONCONTROLLING INTERESTS.
NONCONTROLLING INTERESTS	NOTE 14—NONCONTROLLING INTERESTS The Company has ownership interests in multiple subsidiaries that are consolidated within the Company’s financial statements but are not wholly owned. During the nine months ended September 30, 2017 and 2016, the Company entered into transactions that impacted its ownership interest in certain of these subsidiaries while maintaining control over such subsidiaries. As a result of the Company’s change in ownership interest in these subsidiaries, the Company reduced its noncontrolling interests and recognized an increase in equity related to transactions with holders of noncontrolling interests. The Company reports a noncontrolling interest representing the common units of SES Holdings held by Legacy Owner Holdco. Changes in Select Energy Services’ ownership interest in SES Holdings while it retains its controlling interest are accounted for as equity transactions. The following table summarizes the effects of changes in noncontrolling interests on equity for the nine months ended September 30, 2017: For the nine months ended September 30, 2017 2016 (in thousands) Net loss attributable to Select Energy Services, Inc. and its Predecessor $ (7,164) $ (285,359) Transfers from noncontrolling interests: Increase in additional paid-in capital as a result of the contribution of proceeds from the IPO to SEC Holdings, LLC in exchange for common units 87,835 — Increase in additional paid-in capital as a result of the contribution of assets acquired to SES Holdings, LLC in exchange for common units 4,360 — Increase in contributed capital due to purchase of noncontrolling interest — 135 Change to equity from net loss attributable to Select Energy Services, Inc. and its Predecessor and transfers from noncontrolling interests $ 85,031 $ (285,224)

EARNINGS PER SHARE

EARNINGS PER SHARE	9 Months Ended
	Sep. 30, 2017
EARNINGS PER SHARE
EARNINGS PER SHARE	NOTE 15—EARNINGS PER SHARE Earnings per share are based on the amount of income allocated to the shareholders and the weighted‑average number of shares outstanding during the period for each class of common stock. Outstanding options to purchase 597,749 and 977,352 shares are not included in the calculation of diluted weighted-average shares outstanding for the three and nine months ended September 30, 2017 as the effect is antidilutive. Earnings related to periods prior to the reorganization and 144A Offering are attributable to the Predecessor. The following table presents the Company’s calculation of basic and diluted earnings per share for the three and nine months ended September 30, 2017 and 2016 (dollars in thousands, except share and per share amounts): Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Net income (loss) $ 2,593 $ (35,204) $ (20,177) $ (289,235) Net loss attributable to Predecessor — 34,931 — 285,359 Net (income) loss attributable to noncontrolling interests (1,369) 273 13,013 3,876 Net income (loss) attributable to Select Energy Services, Inc. $ 1,224 $ — $ (7,164) $ — Allocation of net income (loss) attributable to: Class A-1 stockholders $ — $ (2,679) Class A stockholders 1,224 (4,485) Class B stockholders — — $ 1,224 $ (7,164) Weighted average shares outstanding: Class A-1-Basic — 9,671,795 Class A-Basic 30,336,923 16,189,997 Class B-Basic 38,462,541 38,462,541 Net income (loss) per share attributable to common stockholders: Class A-1-Basic $ — $ (0.28) Class A-Basic $ 0.04 $ (0.28) Class B-Basic $ — $ — Weighted average shares outstanding: Class A-1-Diluted — 9,671,795 Class A-Diluted 30,357,572 16,189,997 Class B-Diluted 38,462,541 38,462,541 Net income (loss) per share attributable to common stockholders: Class A-1-Diluted $ — $ (0.28) Class A-Diluted $ 0.04 $ (0.28) Class B-Diluted $ — $ —

SEGMENT INFORMATION

SEGMENT INFORMATION	9 Months Ended
	Sep. 30, 2017
SEGMENT INFORMATION
SEGMENT INFORMATION	NOTE 16—SEGMENT INFORMATION Select Energy Services is an oilfield services company that provides solutions to the North American onshore oil and natural gas industry. The Company’s services are offered through three operating segments. Operating segments are defined as components of an enterprise for which separate financial information is evaluated regularly by the chief operating decision maker (“CODM”) in deciding how to allocate resources and assess performance. The Company’s chief operating decision maker assesses performance and allocates resources on the basis of the three reportable segments. Corporate and other expenses that do not individually meet the criteria for segment reporting are reported separately as Corporate. Each operating segment reflects a reportable segment led by separate managers that report directly to the Company’s CODM. The Company’s CODM assesses performance and allocates resources on the basis of the following three reportable segments: Water Solutions —The Water Solutions segment provides water‑related services to customers that include major integrated oil companies and independent oil and natural gas producers. These services include: the sourcing of water; the transfer of the water to the wellsite through permanent pipeline infrastructure and temporary pipe; the containment of fluids off‑ and on‑location; measuring and monitoring of water; the filtering and treatment of fluids, well testing and handling of flowback and produced formation water; and the transportation and recycling or disposal of drilling, completion and production fluids. Accommodations and Rentals —The Accommodations and Rentals segment provides workforce accommodations and surface rental equipment supporting drilling, completion and production operations to the U.S. onshore oil and gas industry. Wellsite Completion and Construction Services —The Wellsite Completion and Construction Services segment provides oil and natural gas operators with a variety of services, including crane and logistics services, wellsite and pipeline construction and field services. These services are performed to establish, maintain and improve production throughout the productive life of an oil or gas well, or to otherwise facilitate other services performed on a well. Financial information as of September 30, 2017 and December 31, 2016 and for the three and nine months ended September 30, 2017 and 2016, by segment, is as follows: For the three months ended September 30, 2017 Income (loss) before Depreciation and Capital Revenue taxes Amortization Expenditures (in thousands) Water Solutions $ 125,142 $ 9,844 $ 19,433 $ 22,260 Accommodations and Rentals 15,974 (304) 2,908 3,541 Wellsite Completion and Construction Services 13,301 (2) 1,079 1,303 Elimination (537) — — — Income from operations 9,538 Corporate — (7,081) 375 — Interest expense, net — (484) — — Other income, net — 326 — — $ 153,880 $ 2,299 $ 23,795 $ 27,104 For the three months ended September 30, 2016 Income (loss) before Depreciation and Capital Revenue taxes Amortization Expenditures (in thousands) Water Solutions $ 61,082 $ (28,278) $ 17,690 $ 4,668 Accommodations and Rentals 5,881 (2,786) 2,644 268 Wellsite Completion and Construction Services 7,156 (1,325) 1,279 95 Elimination (212) — — — Loss from operations (32,389) Corporate — 1,123 363 — Interest expense, net — (4,343) — — Other income, net — 431 — — $ 73,907 $ (35,178) $ 21,976 $ 5,031 For the nine months ended September 30, 2017 Income (loss) before Depreciation and Capital Revenue taxes Amortization Expenditures (in thousands) Water Solutions $ 311,645 $ 5,652 $ 55,623 $ 57,273 Accommodations and Rentals 39,056 (3,813) 8,367 8,311 Wellsite Completion and Construction Services 38,951 56 3,154 6,598 Elimination (1,398) — — — Loss from operations 1,895 Corporate — (23,855) 1,312 — Interest expense, net — (1,885) — — Other income, net — 3,342 — — $ 388,254 $ (20,503) $ 68,456 $ 72,182 For the nine months ended September 30, 2016 Income (loss) before Depreciation and Capital Revenue taxes Amortization Expenditures (in thousands) Water Solutions $ 173,294 $ (264,416) $ 61,574 $ 28,533 Accommodations and Rentals 19,750 (8,303) 8,197 834 Wellsite Completion and Construction Services 23,098 (3,820) 4,103 215 Elimination (477) — — — Loss from operations (276,539) Corporate — (1,100) 1,644 — Interest expense, net — (11,792) — — Other income, net — 588 — — $ 215,665 $ (288,843) $ 75,518 $ 29,582 Total Assets As of As of September 30, 2017 December 31, 2016 (in thousands) Water Solutions $ 448,585 $ 324,171 Accommodations and Rentals 50,057 38,874 Wellsite Completion and Construction Services 38,827 29,994 Corporate 15,280 12,027 $ 552,749 $ 405,066

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	9 Months Ended
	Sep. 30, 2017
SUBSEQUENT EVENTS
SUBSEQUENT EVENTS	NOTE 17—SUBSEQUENT EVENTS Completion of the Merger On November 1, 2017, the Company completed the transactions contemplated by the Agreement and Plan of Merger, dated as of July 18, 2017 (the “Merger Agreement”), by and among the Company, SES Holdings, Raptor Merger Sub, Inc. (“Corporate Merger Sub”), Raptor Merger Sub, LLC (“LLC Merger Sub”), Rockwater Energy Solutions, Inc. (“Rockwater”) and Rockwater Energy Solutions, LLC (“RES Holdings”). Pursuant to the Merger Agreement, Corporate Merger Sub merged with and into Rockwater, with Rockwater continuing as the surviving entity as a wholly owned subsidiary of the Company (the “Corporate Merger”), and LLC Merger Sub merged with and into RES Holdings, with RES Holdings continuing as the surviving entity as an indirect wholly owned subsidiary of SES Holdings (the “LLC Merger”). At the effective time of the Corporate Merger (the “Corporate Merger Effective Time”), subject to certain exceptions, (x) each share of Rockwater’s Class A common stock, $0.01 par value per share (“Rockwater Class A Common Stock”), then outstanding was converted into the right to receive a number of shares of Select Class A Common Stock equal to 0.7652 per each such share (the “Exchange Ratio”), (y) each share of Rockwater’s Class A-1 common stock, $0.01 par value per share, then outstanding was converted into the right to receive a number of shares of the Company’s Class A-2 common stock, par value $0.01 per share (“Select Class A-2 Common Stock”), equal to the Exchange Ratio, and (z) each share of Rockwater’s Class B common stock, $0.01 par value per share, then outstanding was converted into the right to receive a number of shares of Select Class B Common Stock equal to the Exchange Ratio. At the effective time of the LLC Merger (the “LLC Merger Effective Time”), subject to certain exceptions, each unit of RES Holdings (each, an “RES Holdings Unit”) then outstanding (including RES Holdings Units held by Rockwater) was converted into the right to receive a number of units in SES Holdings equal to the Exchange Ratio. The original exchange ratio of 0.7777 set forth in the Merger Agreement was adjusted downwards to 0.7652 in accordance with the terms of the Merger Agreement. Shares of the Company’s common stock outstanding immediately prior to the Corporate Merger Effective Time remain outstanding and have not been exchanged, converted or otherwise changed in the Corporate Merger. Based on the number of shares of Rockwater common stock issued and outstanding immediately prior to the Corporate Merger Effective Time, a total of approximately 25.9 million shares of Select Class A Common Stock, 6.7 million shares of Select Class A-2 Common Stock and 4.4 million shares of Select Class B Common Stock (excluding the issuance of equity awards, which are described in the following paragraph), were issued to the former holders of Rockwater common stock pursuant to the Merger Agreement. In the aggregate (including the issuance of equity awards), the Company issued approximately 37.3 million shares of common stock. Units in SES Holdings outstanding immediately prior to the LLC Merger Effective Time remain outstanding and have not been exchanged, converted or otherwise changed in the LLC Merger. Based on the number of RES Holdings Units issued and outstanding immediately prior to the LLC Merger Effective Time, a total of approximately 37.3 million units in SES Holdings were issued to the former holders of RES Holdings Units pursuant to the Merger Agreement. At the Corporate Merger Effective Time, each outstanding option to purchase shares of Rockwater Class A Common Stock (each, a “Rockwater Stock Option”) was converted into an option to acquire, on the same terms and conditions as were applicable to such Rockwater Stock Option immediately prior to the Corporate Merger Effective Time, the number of shares of Select Class A Common Stock determined by multiplying the number of shares of Rockwater Class A Common Stock subject to such Rockwater Stock Option as of immediately prior to the Corporate Merger Effective Time by the Exchange Ratio, at an exercise price per share of Select Class A Common Stock equal to the exercise price per share of Rockwater Class A Common Stock under such Rockwater Stock Option divided by the Exchange Ratio (such conversions, collectively, the “Option Conversion”). Additionally, at the Corporate Merger Effective Time, each share of restricted Rockwater Class A Common Stock (each, a “Rockwater Restricted Stock Award”) that was outstanding immediately prior to the Corporate Merger Effective Time ceased to represent Rockwater Class A Common Stock and was converted into a new award of restricted shares, subject to the same terms and conditions as were applicable to such Rockwater Restricted Stock Award prior to the Corporate Merger Effective Time, equal to the number of shares of Select Class A Common Stock determined by multiplying the number of shares of Rockwater Class A Common Stock subject to such Rockwater Restricted Stock Award as of immediately prior to the Corporate Merger Effective Time by the Exchange Ratio (such conversions, collectively, the “Restricted Stock Conversion”). Subject to certain New York Stock Exchange (“NYSE”) restrictions, the shares available under the Rockwater Equity Plan as of the Corporate Merger Effective Time (as appropriately adjusted to reflect the Exchange Ratio) may be used for post-transaction grants under the 2016 Plan. The Option Conversion, Restricted Stock Conversion and assumption of shares available under the Rockwater Equity Plan described in the preceding sentences are collectively referred to as the “Equity Award Actions.” The Equity Plan Amendment, which was previously adopted to effectuate the Equity Award Actions, became effective on November 1, 2017 at the Corporate Merger Effective Time. New Credit Agreement On November 1, 2017, in connection with the closing of the transactions contemplated by the Merger Agreement (the “Closing”), SES Holdings and Select LLC (the “Borrower”) entered into a $300.0 million senior secured revolving credit facility (the “New Credit Agreement”), by and among SES Holdings, as parent, the Borrower, certain of SES Holdings’s subsidiaries, as guarantors, each of the lenders party thereto and Wells Fargo Bank, N.A., as administrative agent, issuing lender and swingline lender (the “Administrative Agent”). The New Credit Agreement also has a sublimit of $40.0 million for letters of credit and a sublimit of $30.0 million for swingline loans. Subject to obtaining commitments from existing or new lenders, the Company has the option to increase the maximum amount under the senior secured credit facility by $150.0 million during the first three years following the Closing. The New Credit Agreement permits extensions of credit up to the lesser of $300.0 million and a borrowing base that is determined by calculating the amount equal to the sum of (i) 85% of the Eligible Billed Receivables (as defined in the New Credit Agreement), plus (ii) 75% of Eligible Unbilled Receivables (as defined in the New Credit Agreement), provided that this amount will not equal more than 35% of the borrowing base, plus (iii) the lesser of (A) the product of 70% multiplied by the value of Eligible Inventory (as defined in the New Credit Agreement) at such time and (B) the product of 85% multiplied by the Net Recovery Percentage (as defined in the New Credit Agreement) identified in the most recent Acceptable Appraisal of Inventory (as defined in the New Credit Agreement), multiplied by the value of Eligible Inventory at such time, provided that this amount will not equal more than 30% of the borrowing base, minus (iv) the aggregate amount of Reserves (as defined in the New Credit Agreement), if any, established by the Administrative Agent from time to time, including, if any, the amount of the Dilution Reserve (as defined in the New Credit Agreement). The borrowing base is calculated on a monthly basis pursuant to a borrowing base certificate delivered by the Borrower to the Administrative Agent. Borrowings under the New Credit Agreement bear interest, at the Borrower’s election, at either the (a) one-, two-, three- or six-month LIBOR (“Eurocurrency Rate”) or (b) the greatest of (i) the federal funds rate plus ½%, (ii) the one-month Eurocurrency Rate plus 1% and (iii) the Administrative Agent’s prime rate (the “Base Rate”), in each case plus an applicable margin, and interest shall be payable monthly in arrears. The applicable margin for Eurocurrency Rate loans ranges from 1.50% to 2.00% and the applicable margin for Base Rate loans ranges from 0.50% to 1.00%, in each case, depending on the Borrower’s average excess availability under the New Credit Agreement. The applicable margin for Eurocurrency Rate loans will be 1.75% and the applicable margin for Base Rate loans will be 0.75% until June 30, 2018. During the continuance of a bankruptcy event of default, automatically and during the continuance of any other default, upon the Administrative Agent’s or the required lenders’ election, all outstanding amounts under the New Credit Agreement will bear interest at 2.00% plus the otherwise applicable interest rate. The New Credit Agreement is scheduled to mature on the fifth anniversary of the Closing. The obligations under the New Credit Agreement are guaranteed by SES Holdings and certain of the subsidiaries of SES Holdings and the Borrower and secured by a security interest in substantially all of the personal property assets of SES Holdings, the Borrower and their domestic subsidiaries. The New Credit Agreement contains certain customary representations and warranties, affirmative and negative covenants and events of default. If an event of default occurs and is continuing, the lenders may declare all amounts outstanding under the New Credit Agreement to be immediately due and payable. In addition, the New Credit Agreement restricts SES Holdings’s and the Borrower’s ability to make distributions on, or redeem or repurchase, its equity interests, except for certain distributions, including distributions of cash so long as, both at the time of the distribution and after giving effect to the distribution, no default exists under the New Credit Agreement and either (a) excess availability at all times during the preceding 30 consecutive days, on a pro forma basis and after giving effect to such distribution, is not less than the greater of (1) 25% of the lesser of (A) the maximum revolver amount and (B) the then-effective borrowing base and (2) $37.5 million or (b) if SES Holdings’s fixed charge coverage ratio is at least 1.0 to 1.0 on a pro forma basis, and excess availability at all times during the preceding 30 consecutive days, on a pro forma basis and after giving effect to such distribution, is not less than the greater of (1) 20% of the lesser of (A) the maximum revolver amount and (B) the then-effective borrowing base and (2) $30.0 million. Additionally, the New Credit Agreement generally permits the Borrower to make distributions required under its existing tax receivable agreements. The New Credit Agreement also requires SES Holdings to maintain a fixed charge coverage ratio of at least 1.0 to [1.0] at any time availability under the New Credit Agreement is less than the greater of (i) 10% of the lesser of (A) the maximum revolver amount and (B) the then-effective borrowing base and (ii) $15.0 million and continuing through and including the first day after such time that availability under the New Credit Agreement has equaled or exceeded the greater of (i) 10% of the lesser of (A) the maximum revolver amount and (B) the then-effective borrowing base and (ii) $15.0 million for 60 consecutive calendar days. Certain lenders party to the New Credit Agreement and their respective affiliates have from time to time performed, and may in the future perform, various financial advisory, commercial banking and investment banking services for the Company and its affiliates in the ordinary course of business for which they have received and would receive customary compensation. In addition, in the ordinary course of their various business activities, such parties and their respective affiliates may make or hold a broad array of investments and actively trade debt and equity securities (or related derivative securities) and financial instruments (including bank loans) for their own account and for the accounts of their customers, and such investments and securities activities may involve the Company’s securities and/or instruments. Termination of Credit Facility In connection with the entry into the New Credit Agreement, the obligations of SES Holdings and the Borrower under the Credit Facility were repaid in full and the Credit Facility was terminated. Certain lenders party to the Credit Facility and their respective affiliates have from time to time performed, and may in the future perform, various financial advisory, commercial banking and investment banking services for the Company and its affiliates in the ordinary course of business for which they have received and would receive customary compensation. In addition, in the ordinary course of their various business activities, such parties and their respective affiliates may make or hold a broad array of investments and actively trade debt and equity securities (or related derivative securities) and financial instruments (including bank loans) for their own account and for the accounts of their customers, and such investments and securities activities may involve the Company’s securities and/or instruments. In addition, certain lenders party to the Credit Facility are lenders under the New Credit Agreement.

SIGNIFICANT ACCOUNTING POLICI25

SIGNIFICANT ACCOUNTING POLICIES (POLICIES)	9 Months Ended
	Sep. 30, 2017
SIGNIFICANT ACCOUNTING POLICIES
Use of estimates	Use of estimates : The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. On an ongoing basis, the Company evaluates its estimates, including those related to recoverability of long‑lived assets and intangibles, useful lives used in depreciation and amortization, uncollectible accounts receivable, income taxes, self‑insurance liabilities, share‑based compensation and contingent liabilities. The Company bases its estimates on historical and other pertinent information that are believed to be reasonable under the circumstances. The accounting estimates used in the preparation of the consolidated financial statements may change as new events occur, as more experience is acquired, as additional information is obtained and as the Company’s operating environment changes.
Emerging Growth Company Status	Emerging Growth Company status: Under the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), we are an “emerging growth company,” or an “EGC,” which allows us to have an extended transition period for complying with new or revised accounting standards pursuant to Section 107(b) of the JOBS Act. We intend to take advantage of all of the reduced reporting requirements and exemptions, including the longer phase‑in periods for the adoption of new or revised financial accounting standards under Section 107 of the JOBS Act until we are no longer an emerging growth company. Our election to use the phase‑in periods permitted by this election may make it difficult to compare our financial statements to those of non‑emerging growth companies and other emerging growth companies that have opted out of the longer phase‑in periods under Section 107 of the JOBS Act and who will comply with new or revised financial accounting standards. If we were to subsequently elect instead to comply immediately with these public company effective dates, such election would be irrevocable pursuant to Section 107 of the JOBS Act.
Recent accounting pronouncements:	Recent accounting pronouncements : In May 2014, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers (Topic 606) , outlining a comprehensive new revenue recognition standard that will supersede ASC 605, Revenue Recognition. The new accounting guidance creates a framework under which an entity will allocate the transaction price to separate performance obligations and recognize revenue when each performance obligation is satisfied. Under the new standard, entities will be required to use judgment and make estimates, including identifying performance obligations in a contract, estimating the amount of variable consideration to include in the transaction price, allocating the transaction price to each separate performance obligation, and determining when an entity satisfies its performance obligations. The standard allows for either “full retrospective” adoption, meaning that the standard is applied to all of the periods presented with a cumulative catch‑up as of the earliest period presented, or “modified retrospective” adoption, meaning the standard is applied only to the most current period presented in the financial statements with a cumulative catch‑up as of the current period. In August 2015, the FASB decided to defer the original effective date by one year. As long as the Company is an EGC and able to utilize the extended transition period for new accounting pronouncements, this guidance will be effective for annual reporting periods beginning after December 15, 2018, and interim reporting periods within annual reporting periods beginning after December 15, 2019. The Company is still evaluating the impact that the new accounting guidance will have on its consolidated financial statements and related disclosures and has not yet determined the method by which it will adopt the standard. In November 2015, the FASB issued ASU 2015-17, Balance Sheet Classification of Deferred Taxes , which amends existing guidance on income taxes to require the classification of all deferred tax assets and liabilities as noncurrent on the balance sheet. As an EGC utilizing the extended transition period for new accounting pronouncements, this pronouncement is effective for annual reporting periods beginning after December 15, 2017, and interim periods within annual periods beginning after December 15, 2018, and may be applied either prospectively or retrospectively. The Company prospectively adopted this guidance during the nine months ended September 30, 2017. Prior periods were not retrospectively adjusted. As the Company’s deferred tax assets and liabilities are all noncurrent, the adoption did not result in a change to the consolidated financial statements and related disclosures. In February 2016, the FASB issued ASU 2016-02, Leases , which introduces a lessee model that brings most leases on the balance sheet. The new standard also aligns many of the underlying principles of the new lessor model with those in the current accounting guidance as well as the FASB’s new revenue recognition standard. However, the ASU eliminates the use of bright‑line tests in determining lease classification as required in the current guidance. The ASU also requires additional qualitative disclosures along with specific quantitative disclosures to better enable users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. As an EGC utilizing the extended transition period for new accounting pronouncements, this pronouncement is effective for annual reporting periods beginning after December 15, 2019, and interim periods within fiscal years beginning after December 15, 2020, using a modified retrospective approach. Early adoption is permitted. The Company is still evaluating the impact that the new accounting guidance will have on its consolidated financial statements and related disclosures. In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting , that provides a new requirement to record all of the tax effects related to share‑based payments at settlement (or expiration) through the income statement. As an EGC utilizing the extended transition period for new accounting pronouncements, this pronouncement is effective for annual reporting periods beginning after December 15, 2017, and interim periods within fiscal years beginning after December 15, 2018. The Company is still evaluating the impact that the new accounting guidance will have on its consolidated financial statements and related disclosures. In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments, which addresses the classification and presentation of eight specific cash flow issues that currently result in diverse practices. The amendments provide guidance in the presentation and classification of certain cash receipts and cash payments in the statement of cash flows including debt prepayment or debt extinguishment costs, settlement of zero‑coupon debt instruments, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate‑owned life insurance policies, and distributions received from equity method investees. As an EGC utilizing the extended transition period for new accounting pronouncements, this pronouncement is effective for annual reporting periods beginning after December 15, 2018, and interim periods within fiscal years beginning after December 15, 2019. The amendments in this ASU should be applied using a retrospective approach. The Company is still evaluating the impact that the new accounting guidance will have on its consolidated financial statements and related disclosures. In January 2017, the FASB issued ASU 2017-01 , Clarifying the Definition of a Business , with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. As an EGC utilizing the extended transition period for new accounting pronouncements, this pronouncement is effective for annual reporting periods beginning after December 15, 2018, and interim periods within fiscal years beginning after December 15, 2019. The amendments in this ASU should be applied prospectively. The Company is still evaluating the impact that the new accounting guidance will have on its consolidated financial statements and related disclosures. In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment . This pronouncement removes Step 2 of the goodwill impairment test, which requires a hypothetical purchase price allocation. A goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. This pronouncement is effective for annual reporting periods beginning after December 15, 2019, and interim periods within fiscal years beginning after December 15, 2019. The amendments in this ASU should be applied prospectively. The Company is still evaluating the impact that the new accounting guidance will have on its consolidated financial statements and related disclosures. In May 2017, the FASB issued ASU 2017-09, Scope of Modification Accounting . This pronouncement provides guidance about which changes to the terms and conditions of a share-based payment award require an entity to apply modification accounting in ASC 718. This pronouncement is effective for annual reporting periods beginning after December 15, 2017, and interim periods within fiscal years beginning after December 15, 2017. Early adoption is permitted, including adoption in any interim period. The pronouncement should be applied prospectively to an award modified on or after the adoption date. The Company is still evaluating the impact that the new accounting guidance will have on its consolidated financial statements and related disclosures.

ACQUISITION (Tables)

ACQUISITION (Tables)	9 Months Ended
	Sep. 30, 2017
Schedule of unaudited consolidated pro forma information	Pro Forma Pro Forma Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 (unaudited) (unaudited) (in thousands) (in thousands) Revenue $ 156,045 $ 82,824 $ 400,948 $ 237,644 Net income (loss) $ 3,195 $ (34,344) $ (17,951) $ (289,130) Less: net (income) loss attributable to noncontrolling interests 1 (1,706) 19,284 11,682 163,044 Net income (loss) attributable to Select Energy Services, Inc. 1 $ 1,489 $ (15,060) $ (6,269) $ (126,086) 1 The allocation of net loss attributable to noncontrolling interests and Select Energy Services gives effect to the equity structure as of September 30, 2017 as though the 144A Offering, the IPO, the Resource Water Acquisition, the GRR Acquisition and other equity transactions occurred as of January 1, 2016. However, the calculation of pro forma net loss does not give effect to any other pro forma adjustments for the 144A Offering or the subsequent IPO.
GRR Acquisition
Schedule Of consideration transferred and the estimated fair value of identified assets acquired and liabilities	Preliminary purchase price allocation Amount Consideration transferred (in thousand) Cash paid $ 6,692 Class A common stock issued 2,380 Total consideration transferred 9,072 Less: identified assets Working capital 1,396 Fixed assets 3,485 Customer relationship intangible assets 1,912 Other intangible assets 466 Total identified assets 7,259 Goodwill $ 1,813
Resource Water Acquisition
Schedule Of consideration transferred and the estimated fair value of identified assets acquired and liabilities	Preliminary purchase price allocation Amount Consideration transferred (in thousand) Cash paid $ 51,303 Class A common stock issued 5,500 Total consideration transferred 56,803 Less: identified assets Working capital 6,000 Fixed assets 13,225 Customer relationship intangible assets 21,392 Other intangible assets 5,150 Total identified assets 45,767 Goodwill $ 11,036

EXIT AND DISPOSAL ACTIVITIES (T

EXIT AND DISPOSAL ACTIVITIES (Tables)	9 Months Ended
	Sep. 30, 2017
EXIT AND DISPOSAL ACTIVITIES
Summary of exit and disposal activities	Provision during the Usage during the Balance as of nine months ended nine months ended Balance as of December 31, 2016 September 30, 2017 September 30, 2017 September 30, 2017 (in thousands) Lease obligations and terminations $ 18,000 $ 2,871 $ 2,153 $ 18,718 Reclassification of deferred rent 1,069 1,254 Total $ 19,069 $ 19,972

PROPERTY AND EQUIPMENT (Tables)

PROPERTY AND EQUIPMENT (Tables)	9 Months Ended
	Sep. 30, 2017
PROPERTY AND EQUIPMENT.
Schedule of property and equipment	September 30, 2017 December 31, 2016 (in thousands) Land $ 7,106 $ 8,593 Buildings and leasehold improvements 83,328 83,352 Vehicles and equipment 38,547 24,114 Machinery and equipment 564,741 534,303 Computer equipment and software 11,438 11,102 Office furniture and equipment 3,709 4,275 Disposal wells 67,778 67,566 Helicopters 497 497 Construction in progress 37,858 5,584 815,002 739,386 Less accumulated depreciation and impairment (535,456) (490,519) Total property and equipment, net $ 279,546 $ 248,867

GOODWILL AND OTHER INTANGIBLE29

GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)	9 Months Ended
	Sep. 30, 2017
GOODWILL AND OTHER INTANGIBLE ASSETS
Schedule of changes in the carrying amounts of goodwill by reportable segment	Wellsite Completion Water and Construction Accommodations Solutions Services and Rentals Total (in thousands) Balance as of December 31, 2015 $ 137,534 $ 12,242 $ 995 $ 150,771 Impairment (137,534) — (995) (138,529) Balance as of December 31, 2016 — 12,242 — 12,242 Additions 12,849 — — 12,849 Balance as of September 30, 2017 $ 12,849 $ 12,242 $ — $ 25,091
Summary of components of other intangible assets	September 30, 2017 Gross Accumulated Net Value Amortization Value (in thousands) Customer relationships $ 80,131 $ 54,987 $ 25,144 Other 13,222 3,015 10,207 Total other intangible assets $ 93,353 $ 58,002 $ 35,351 December 31, 2016 Gross Accumulated Net Value Amortization Value (in thousands) Customer relationships $ 56,826 $ 48,236 $ 8,590 Other 5,491 2,495 2,996 Total other intangible assets $ 62,317 $ 50,731 $ 11,586

DEBT (Tables)

DEBT (Tables)	9 Months Ended
	Sep. 30, 2017
DEBT
Summary of Company’s leverage ratio	Leverage Ratio Before Receipt of Fourth Quarter 2017 Eurodollar Base Rate Compliance Certificate Advances Advances < 4.00 4.00 % 3.00 % ≥ 4.00 4.50 % 3.50 % Leverage Ratio After Receipt of Fouth Quarter 2017 Eurodollar Base Rate Compliance Certificate Advances Advances < 2.00 3.00 % 2.00 % ≥ 2.00 < 2.50 3.25 % 2.25 % ≥ 2.50 < 3.00 3.50 % 2.50 % ≥ 3.00 < 3.50 3.75 % 2.75 % ≥ 3.50 < 4.00 4.00 % 3.00 % ≥ 4.00 4.50 % 3.50 %

EQUITY_BASED COMPENSATION (Tabl

EQUITY‑BASED COMPENSATION (Tables)	9 Months Ended
	Sep. 30, 2017
EQUITY BASED COMPENSATION
Schedule of equity option activity and related information	For the nine months ended September 30, 2017 Weighted-average Equity Options Exercise Price Beginning balance 620,721 $ 16.50 Granted 455,130 20.00 Forfeited (98,499) 20.00 Ending balance 977,352 $ 17.78
Schedule of assumptions used in determining the fair value of certain equity options	$20.00 Strike Underlying Equity $ 20.00 Strike Price $ 20.00 Dividend Yield (%) % Risk free rate (%) 1.68 - 2.00 % Volatility (%) 46.6 - 46.8 % Expected Term (Years) 4-6
Schedule of restricted stock activity	For the nine months ended September 30, 2017 Weighted-average Restricted Stock Grant Date Fair Value Beginning balance — $ — Granted 41,117 19.91 Forfeited (10,757) 20.00 Ending balance 30,360 $ 19.88

DERIVATIVE FINANCIAL INSTRUME32

DERIVATIVE FINANCIAL INSTRUMENTS (Tables)	9 Months Ended
	Sep. 30, 2017
DERIVATIVE FINANCIAL INSTRUMENTS
Summary of changes in the fair value of the interest rate swap derivative instruments	For the Nine Months Ended Derivatives designated as cash flow hedges September 30, 2016 (in thousands) Beginning fair value of interest rate swap derivative instruments $ (7) Amount of unrealized losses recognized in OCI (106) Amount of gains reclassified from AOCI to earnings (effective portion) 113 Net change in fair value of interest rate swap derivative instruments 7 Ending fair value of interest rate swap derivative instruments $ —

NONCONTROLLING INTERESTS (Table

NONCONTROLLING INTERESTS (Tables)	9 Months Ended
	Sep. 30, 2017
NONCONTROLLING INTERESTS.
Summary of the effects of changes in noncontrolling interests	For the nine months ended September 30, 2017 2016 (in thousands) Net loss attributable to Select Energy Services, Inc. and its Predecessor $ (7,164) $ (285,359) Transfers from noncontrolling interests: Increase in additional paid-in capital as a result of the contribution of proceeds from the IPO to SEC Holdings, LLC in exchange for common units 87,835 — Increase in additional paid-in capital as a result of the contribution of assets acquired to SES Holdings, LLC in exchange for common units 4,360 — Increase in contributed capital due to purchase of noncontrolling interest — 135 Change to equity from net loss attributable to Select Energy Services, Inc. and its Predecessor and transfers from noncontrolling interests $ 85,031 $ (285,224)

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	9 Months Ended
	Sep. 30, 2017
EARNINGS PER SHARE
Summary of calculation of basic and diluted earnings per share	The following table presents the Company’s calculation of basic and diluted earnings per share for the three and nine months ended September 30, 2017 and 2016 (dollars in thousands, except share and per share amounts): Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Net income (loss) $ 2,593 $ (35,204) $ (20,177) $ (289,235) Net loss attributable to Predecessor — 34,931 — 285,359 Net (income) loss attributable to noncontrolling interests (1,369) 273 13,013 3,876 Net income (loss) attributable to Select Energy Services, Inc. $ 1,224 $ — $ (7,164) $ — Allocation of net income (loss) attributable to: Class A-1 stockholders $ — $ (2,679) Class A stockholders 1,224 (4,485) Class B stockholders — — $ 1,224 $ (7,164) Weighted average shares outstanding: Class A-1-Basic — 9,671,795 Class A-Basic 30,336,923 16,189,997 Class B-Basic 38,462,541 38,462,541 Net income (loss) per share attributable to common stockholders: Class A-1-Basic $ — $ (0.28) Class A-Basic $ 0.04 $ (0.28) Class B-Basic $ — $ — Weighted average shares outstanding: Class A-1-Diluted — 9,671,795 Class A-Diluted 30,357,572 16,189,997 Class B-Diluted 38,462,541 38,462,541 Net income (loss) per share attributable to common stockholders: Class A-1-Diluted $ — $ (0.28) Class A-Diluted $ 0.04 $ (0.28) Class B-Diluted $ — $ —

SEGMENT INFORMATION (Tables)

SEGMENT INFORMATION (Tables)	9 Months Ended
	Sep. 30, 2017
SEGMENT INFORMATION
Summary of financial information by segment	For the three months ended September 30, 2017 Income (loss) before Depreciation and Capital Revenue taxes Amortization Expenditures (in thousands) Water Solutions $ 125,142 $ 9,844 $ 19,433 $ 22,260 Accommodations and Rentals 15,974 (304) 2,908 3,541 Wellsite Completion and Construction Services 13,301 (2) 1,079 1,303 Elimination (537) — — — Income from operations 9,538 Corporate — (7,081) 375 — Interest expense, net — (484) — — Other income, net — 326 — — $ 153,880 $ 2,299 $ 23,795 $ 27,104 For the three months ended September 30, 2016 Income (loss) before Depreciation and Capital Revenue taxes Amortization Expenditures (in thousands) Water Solutions $ 61,082 $ (28,278) $ 17,690 $ 4,668 Accommodations and Rentals 5,881 (2,786) 2,644 268 Wellsite Completion and Construction Services 7,156 (1,325) 1,279 95 Elimination (212) — — — Loss from operations (32,389) Corporate — 1,123 363 — Interest expense, net — (4,343) — — Other income, net — 431 — — $ 73,907 $ (35,178) $ 21,976 $ 5,031 For the nine months ended September 30, 2017 Income (loss) before Depreciation and Capital Revenue taxes Amortization Expenditures (in thousands) Water Solutions $ 311,645 $ 5,652 $ 55,623 $ 57,273 Accommodations and Rentals 39,056 (3,813) 8,367 8,311 Wellsite Completion and Construction Services 38,951 56 3,154 6,598 Elimination (1,398) — — — Loss from operations 1,895 Corporate — (23,855) 1,312 — Interest expense, net — (1,885) — — Other income, net — 3,342 — — $ 388,254 $ (20,503) $ 68,456 $ 72,182 For the nine months ended September 30, 2016 Income (loss) before Depreciation and Capital Revenue taxes Amortization Expenditures (in thousands) Water Solutions $ 173,294 $ (264,416) $ 61,574 $ 28,533 Accommodations and Rentals 19,750 (8,303) 8,197 834 Wellsite Completion and Construction Services 23,098 (3,820) 4,103 215 Elimination (477) — — — Loss from operations (276,539) Corporate — (1,100) 1,644 — Interest expense, net — (11,792) — — Other income, net — 588 — — $ 215,665 $ (288,843) $ 75,518 $ 29,582 Total Assets As of As of September 30, 2017 December 31, 2016 (in thousands) Water Solutions $ 448,585 $ 324,171 Accommodations and Rentals 50,057 38,874 Wellsite Completion and Construction Services 38,827 29,994 Corporate 15,280 12,027 $ 552,749 $ 405,066

BUSINESS AND BASIS OF PRESENT36

BUSINESS AND BASIS OF PRESENTATION (Details) $ / shares in Units, $ in Thousands	May 12, 2017$ / sharesshares	May 05, 2017USD ($)$ / shares	Apr. 26, 2017$ / sharesshares	Dec. 20, 2016USD ($)$ / sharesshares	May 31, 2017USD ($)	Sep. 30, 2017USD ($)$ / sharesshares	Sep. 30, 2016USD ($)	Dec. 31, 2016$ / sharesshares
Share price | $ / shares						$ 20
Net proceeds from the IPO | $					$ 128,500
Payments on long-term debt | $						$ 34,000	$ 36,334
Settlement of phantom units | $		$ 7,800
Revolving line of credit
Maximum borrowing capacity | $				$ 100,000
Predecessor
Ratio				10.3583
Common units issued				16,100,000
Class A-1 common stock
Par value | $ / shares				$ 0.01		$ 0.01		$ 0.01
Common stock issued						0		16,100,000
Class A-1 common stock | Private Placement
Shares issued				16,100,000
Share price | $ / shares				$ 20
Class A common stock
Shares issued						10,005,000
Par value | $ / shares						$ 0.01		$ 0.01
Common stock issued						30,468,249		3,802,972
Class A common stock | IPO
Shares issued			8,700,000
Share price | $ / shares		$ 14	$ 14
Class A common stock | Over-allotment option
Shares issued	1,305,000
Share price | $ / shares	$ 14
Class B common stock
Par value | $ / shares						$ 0.01		$ 0.01
Common stock issued						38,462,541		38,462,541
Legacy Owner Holdco | Class B common stock | Private Placement
Common units issued				38,462,541
Contributing Legacy Owners | Class A common stock | Predecessor
Common units issued				3,802,972
Common stock issued				3,802,972

ACQUISITION - Resource Water Ac

ACQUISITION - Resource Water Acquisition (Details) - USD ($) $ / shares in Units, $ in Thousands	Sep. 15, 2017	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
ACQUISITION
Goodwill		$ 25,091	$ 12,242	$ 150,771
Resource Water Acquisition
ACQUISITION
Miles of layflat hose	24
Total consideration paid	$ 9,072
Cash paid	6,692
Value of Class A common stock issued	$ 2,380
Class A Common stock issued, Share Price	$ 15.17
Cash on hand	$ 6,700
Transaction cost	100
Goodwill	$ 1,813

ACQUISITION - Resource Water 38

ACQUISITION - Resource Water Acquisition - Purchase price allocation (Details) - USD ($) $ in Thousands	Sep. 15, 2017	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Less: identified assets
Goodwill		$ 25,091	$ 12,242	$ 150,771
Resource Water Acquisition
Consideration transferred
Cash paid	$ 6,692
Value of Class A common stock issued	2,380
Total consideration transferred	9,072
Less: identified assets
Working capital	1,396
Fixed assets	3,485
Total identified assets	7,259
Transaction cost	100
Goodwill	1,813
Resource Water Acquisition | Customer relationships
Less: identified assets
Intangible assets	1,912
Resource Water Acquisition | Other
Less: identified assets
Intangible assets	$ 466

ACQUISITION - GRR Acquisition (

ACQUISITION - GRR Acquisition (Details) - USD ($) $ / shares in Units, $ in Thousands	Mar. 10, 2017	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
ACQUISITION
Goodwill		$ 25,091	$ 12,242	$ 150,771
GRR Acquisition
ACQUISITION
Total consideration paid	$ 56,803
Cash paid	51,303
Value of Class A common stock issued	$ 5,500
Class A Common stock issued, Share Price	$ 20
Cash on hand	$ 17,300
Proceeds from credit facility	34,000
Goodwill	$ 11,036

ACQUISITION - GRR Acquisition -

ACQUISITION - GRR Acquisition - Purchase price allocation (Details2) - USD ($) $ in Thousands	Mar. 10, 2017	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Less: identified assets
Goodwill		$ 25,091	$ 12,242	$ 150,771
GRR Acquisition
Consideration transferred
Cash paid	$ 51,303
Value of Class A common stock issued	5,500
Total consideration transferred	56,803
Less: identified assets
Working capital	6,000
Fixed assets	13,225
Total identified assets	45,767
Transaction cost		$ 1,000
Goodwill	11,036
GRR Acquisition | Customer relationships
Less: identified assets
Intangible assets	21,392
GRR Acquisition | Other
Less: identified assets
Intangible assets	$ 5,150

ACQUISITION - Proforma (Details

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)

ACQUISITION - Other Acquisition

ACQUISITION - Other Acquisitions (Details) - USD ($) $ in Thousands	Jun. 21, 2017	May 30, 2017	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
ACQUISITION
Goodwill			$ 25,091	$ 12,242	$ 150,771
Data Automated Waters Systems, LLC
ACQUISITION
Total consideration paid		$ 4,000
Cash paid		$ 2,000
Class A common stock issued		128,370
Value of Class A common stock issued		$ 2,000
Fixed assets		1,800
Data Automated Waters Systems, LLC | Patents
ACQUISITION
Intangible assets		1,900
Data Automated Waters Systems, LLC | Software
ACQUISITION
Intangible assets		$ 300
Tex-Star Water Services, LLC
ACQUISITION
Cash paid	$ 4,200

EXIT AND DISPOSAL ACTIVITIES (D

EXIT AND DISPOSAL ACTIVITIES (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017USD ($)	Dec. 31, 2016USD ($)item
Exit and disposal activities
Number of facilities closed | item		15
Charges related to exit and disposal activities	$ 2,900
Accrued Liabilities and Other Liabilities	39,713	$ 22,091
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	19,069
Restructuring Reserve, Ending Balance	19,972	19,069
Accrued Liabilities [Member]
Exit and disposal activities
Accrued Liabilities and Other Liabilities	1,900
Lease obligations and terminations
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	18,000
Provision for Restructuring	2,871
Payments for Restructuring	2,153
Restructuring Reserve, Ending Balance	18,718	18,000
Reclassifications of deferred rent
Exit and disposal activities
Amount reclassed to accrued lease obligations	200
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	1,069
Restructuring Reserve, Ending Balance	$ 1,254	$ 1,069

PROPERTY AND EQUIPMENT (Details

PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2017	Dec. 31, 2016
Property and equipment
Property and equipment, gross		$ 815,002	$ 739,386
Less accumulated depreciation and impairment		(535,456)	(490,519)
Total property and equipment, net		279,546	248,867
Impairment of property and equipment	$ 60,026
Capital lease obligations		0	0
Land
Property and equipment
Property and equipment, gross		7,106	8,593
Building and leasehold improvements
Property and equipment
Property and equipment, gross		83,328	83,352
Vehicles and equipment
Property and equipment
Property and equipment, gross		38,547	24,114
Machinery and equipment
Property and equipment
Property and equipment, gross		564,741	534,303
Computer equipment and software
Property and equipment
Property and equipment, gross		11,438	11,102
Office furniture and equipment
Property and equipment
Property and equipment, gross		3,709	4,275
Disposal wells
Property and equipment
Property and equipment, gross		67,778	67,566
Helicopters
Property and equipment
Property and equipment, gross		497	497
Construction in progress
Property and equipment
Property and equipment, gross		$ 37,858	$ 5,584

GOODWILL AND OTHER INTANGIBLE45

GOODWILL AND OTHER INTANGIBLE ASSETS - GOODWILL (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Goodwill
Balance at the beginning of the period	$ 12,242	$ 150,771
Impairment		(138,529)
Additions	12,849
Balance at the end of the period	25,091	12,242
Water Solutions
Goodwill
Balance at the beginning of the period		137,534
Impairment		(137,534)
Additions	12,849
Balance at the end of the period	12,849
Wellsite Completion and Construction Services
Goodwill
Balance at the beginning of the period	12,242	12,242
Balance at the end of the period	$ 12,242	12,242
Accommodations and Rentals
Goodwill
Balance at the beginning of the period		995
Impairment		$ (995)

GOODWILL AND OTHER INTANGIBLE46

GOODWILL AND OTHER INTANGIBLE ASSETS - OTHER INTANGIBLE ASSETS (Details2) - USD ($) $ in Thousands	May 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Mar. 10, 2017	Dec. 31, 2016
Other intangible assets
Gross Value		$ 93,353		$ 93,353			$ 62,317
Accumulated Amortization		58,002		58,002			50,731
Net Value		35,351		35,351			11,586
Amortization expense		2,600	$ 2,100	$ 7,300	$ 6,700
GRR Acquisition | Weighted-average
Other intangible assets
Useful life of acquired intangible asset				12 years 6 months
Resource Water Acquisition | Weighted-average
Other intangible assets
Useful life of acquired intangible asset				8 years 7 months 6 days
Customer relationships
Other intangible assets
Gross Value		80,131		$ 80,131			56,826
Accumulated Amortization		54,987		54,987			48,236
Net Value		25,144		$ 25,144			8,590
Customer relationships | Minimum
Other intangible assets
Useful life of intangible asset				5 years
Customer relationships | Maximum
Other intangible assets
Useful life of intangible asset				7 years
Customer relationships | GRR Acquisition
Other intangible assets
Useful life of acquired intangible asset				13 years
Customer relationships | Resource Water Acquisition
Other intangible assets
Useful life of intangible asset				10 years
Noncompete agreements | Minimum
Other intangible assets
Useful life of intangible asset				3 years
Noncompete agreements | Maximum
Other intangible assets
Useful life of intangible asset				5 years
Noncompete agreements | GRR Acquisition
Other intangible assets
Useful life of acquired intangible asset				5 years
Noncompete agreements | Resource Water Acquisition
Other intangible assets
Useful life of intangible asset				3 years
Other
Other intangible assets
Gross Value		13,222		$ 13,222			5,491
Accumulated Amortization		3,015		3,015			2,495
Net Value		$ 10,207		$ 10,207			$ 2,996
Other | Minimum
Other intangible assets
Useful life of intangible asset				3 years
Other | Maximum
Other intangible assets
Useful life of intangible asset				8 years
Water rights | GRR Acquisition
Other intangible assets
Gross Value						$ 3,700
Patents
Other intangible assets
Gross Value	$ 1,900
Useful life of intangible asset	10 years

DEBT (Details)

DEBT (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Dec. 20, 2016
Revolving line of credit
DEBT
Maximum borrowing capacity				$ 100
Commitment fee (as a percent)	0.50%
Debt outstanding		$ 0	$ 0
Outstanding letters of credit	$ 14.1
Unamortized debt issuance cost	$ 3
Revolving line of credit | Before Receipt Of Third Quarter 2017 Compliance Certificate | Leverage ratio less than 4.00 | Eurodollar Advances
DEBT
Margin (as a percent)	4.00%
Revolving line of credit | Before Receipt Of Third Quarter 2017 Compliance Certificate | Leverage ratio less than 4.00 | Base Rate Advances
DEBT
Margin (as a percent)	3.00%
Revolving line of credit | Before Receipt Of Third Quarter 2017 Compliance Certificate | Leverage ratio greater than equal to 4.00 | Eurodollar Advances
DEBT
Margin (as a percent)	4.50%
Revolving line of credit | Before Receipt Of Third Quarter 2017 Compliance Certificate | Leverage ratio greater than equal to 4.00 | Base Rate Advances
DEBT
Margin (as a percent)	3.50%
Revolving line of credit | After Receipt Of Third Quarter 2017 Compliance Certificate | Leverage ratio less than 2.00 | Eurodollar Advances
DEBT
Margin (as a percent)	3.00%
Revolving line of credit | After Receipt Of Third Quarter 2017 Compliance Certificate | Leverage ratio less than 2.00 | Base Rate Advances
DEBT
Margin (as a percent)	2.00%
Revolving line of credit | After Receipt Of Third Quarter 2017 Compliance Certificate | Leverage ratio greater than equal to 2.00 less than 2.50 | Eurodollar Advances
DEBT
Margin (as a percent)	3.25%
Revolving line of credit | After Receipt Of Third Quarter 2017 Compliance Certificate | Leverage ratio greater than equal to 2.00 less than 2.50 | Base Rate Advances
DEBT
Margin (as a percent)	2.25%
Revolving line of credit | After Receipt Of Third Quarter 2017 Compliance Certificate | Leverage ratio greater than equal to 2.50 less than 3.00 | Eurodollar Advances
DEBT
Margin (as a percent)	3.50%
Revolving line of credit | After Receipt Of Third Quarter 2017 Compliance Certificate | Leverage ratio greater than equal to 2.50 less than 3.00 | Base Rate Advances
DEBT
Margin (as a percent)	2.50%
Revolving line of credit | After Receipt Of Third Quarter 2017 Compliance Certificate | Leverage ratio greater than equal to 3.00 less than 3.50 | Eurodollar Advances
DEBT
Margin (as a percent)	3.75%
Revolving line of credit | After Receipt Of Third Quarter 2017 Compliance Certificate | Leverage ratio greater than equal to 3.00 less than 3.50 | Base Rate Advances
DEBT
Margin (as a percent)	2.75%
Revolving line of credit | After Receipt Of Third Quarter 2017 Compliance Certificate | Leverage ratio greater than equal to 3.50 less than 4.00 | Eurodollar Advances
DEBT
Margin (as a percent)	4.00%
Revolving line of credit | After Receipt Of Third Quarter 2017 Compliance Certificate | Leverage ratio greater than equal to 3.50 less than 4.00 | Base Rate Advances
DEBT
Margin (as a percent)	3.00%
Revolving line of credit | After Receipt Of Third Quarter 2017 Compliance Certificate | Leverage ratio greater than equal to 4.00 | Eurodollar Advances
DEBT
Margin (as a percent)	4.50%
Revolving line of credit | After Receipt Of Third Quarter 2017 Compliance Certificate | Leverage ratio greater than equal to 4.00 | Base Rate Advances
DEBT
Margin (as a percent)	3.50%
Letter of credit
DEBT
Unused portion of available borrowing	$ 85.9
Letter of credit | Minimum
DEBT
Variable interest rate (as a percent)	3.00%
Letter of credit | Maximum
DEBT
Variable interest rate (as a percent)	4.50%

EQUITY BASED COMPENSATION (Deta

EQUITY BASED COMPENSATION (Details) - $ / shares	9 Months Ended
	Sep. 30, 2017	May 12, 2017	May 05, 2017	Apr. 26, 2017
EQUITY-BASED COMPENSATION
Vesting period	3 years
Share Price	$ 20
Minimum
EQUITY-BASED COMPENSATION
Equity options term	7 years
Maximum
EQUITY-BASED COMPENSATION
Equity options term	10 years
Class A common stock | Over-allotment option
EQUITY-BASED COMPENSATION
Share Price		$ 14
Class A common stock | IPO
EQUITY-BASED COMPENSATION
Share Price			$ 14	$ 14
2016 plan | Maximum
EQUITY-BASED COMPENSATION
Equity options term	10 years
2016 plan | Class A common stock
EQUITY-BASED COMPENSATION
Maximum number of shares	5,400,400
Rockwater Equity Plan | Class A common stock
EQUITY-BASED COMPENSATION
Maximum number of shares	1,011,087
Phantom Equity Awards
EQUITY-BASED COMPENSATION
Cash payment (per phantom unit)			$ 5.53
Substitute Awards | 2016 plan | Class A common stock
EQUITY-BASED COMPENSATION
Maximum number of shares	2,887,048

EQUITY BASED COMPENSATION - Equ

EQUITY BASED COMPENSATION - Equity Options (Details2)	9 Months Ended
	Sep. 30, 2017$ / sharesshares
Equity Options
Beginning balance (in shares) | shares	620,721
Granted (in shares) | shares	455,130
Forfeited | shares	(98,499)
Ending balance (in shares) | shares	977,352
Weighted-average Exercise Price
Beginning balance (in dollars per share) | $ / shares	$ 16.50
Granted (in dollars per share) | $ / shares	20
Forfeited (in dollars per share) | $ / shares	20
Ending balance (in dollars per share) | $ / shares	$ 17.78

EQUITY BASED COMPENSATION - Ass

EQUITY BASED COMPENSATION - Assumptions (Details3)	9 Months Ended
	Sep. 30, 2017$ / sharesshares
EQUITY-BASED COMPENSATION
Weighted-average grant date fair value of equity options granted	$ 7.85
Assumptions for equity options granted:
Underlying Equity	20
Strike Price	$ 20
Dividend Yield (%)	0.00%
Risk free rate(%), minimum	1.68%
Risk free rate(%), maximum	2.00%
Volatility (%), minimum	46.60%
Volatility (%), maximum	46.80%
Vested (in shares) | shares	0
Minimum
Assumptions for equity options granted:
Expected Term (Years)	4 years
Maximum
Assumptions for equity options granted:
Expected Term (Years)	6 years

EQUITY BASED COMPENSATION - Res

EQUITY BASED COMPENSATION - Restricted stock (Details4) - Restricted Stock - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Restricted stock
Granted (in shares)			41,117
Forfeited			(10,757)
Ending balance (in shares)	30,360		30,360
Grant Date Fair Value
Granted (in dollars per share)			$ 19.91
Forfeited			20
Ending balance (in dollars per share)	$ 19.88		$ 19.88
Compensation expense	$ 0.6	$ 0	$ 1.8	$ 0.3

EQUITY BASED COMPENSATION - Pha

EQUITY BASED COMPENSATION - Phantom Awards (Details5) - USD ($) $ / shares in Units, $ in Millions	May 06, 2017	May 05, 2017	Sep. 30, 2017
EQUITY-BASED COMPENSATION
Settlement of phantom units		$ 7.8
Share price			$ 20
Phantom Awards
EQUITY-BASED COMPENSATION
Settlement of phantom units	$ 7.8
Share price	$ 14
Cash payment amount per award	$ 5.53
Compensation expense	$ 7.8
Outstanding units			0

DERIVATIVE FINANCIAL INSTRUME53

DERIVATIVE FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Apr. 30, 2013
DERIVATIVE FINANCIAL INSTRUMENTS
Beginning fair value of interest rate swap derivative instruments	$ (7)
Amount of unrealized losses recognized in OCI	(106)
Amount of gains reclassified from AOCI to earnings (effective portion)	113
Net change in unrealized gain	$ 7
Interest Rate Swap | Cash Flow Hedging
DERIVATIVE FINANCIAL INSTRUMENTS
Aggregate notional amount		$ 125,000

FAIR VALUE MEASUREMENT (Details

FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
FAIR VALUE MEASUREMENT
Transfers into Level3	$ 0	$ 0
Transfers out of Level3	0	0
Debt outstanding	$ 0	$ 0

RELATED PARTY TRANSACTIONS (Det

RELATED PARTY TRANSACTIONS (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
RELATED PARTY TRANSACTIONS
Sales to related parties	$ 400,000	$ 200,000	$ 1,500,000	$ 800,000
Purchases from related party vendors	$ 2,100,000	900,000	$ 5,000,000	2,600,000
Minimum
RELATED PARTY TRANSACTIONS
Beneficial ownership (as a percent)	5.00%		5.00%
Tax Receivable Agreement
RELATED PARTY TRANSACTIONS
Number of tax receivable agreements			$ 2
Tax Receivable Agreement | Legacy Owner Holdco and Crestview GP
RELATED PARTY TRANSACTIONS
Percentage of net tax savings for payment to TRA Holders			85
Tax Receivable Agreement | Contributing Legacy Owners
RELATED PARTY TRANSACTIONS
Percentage of net tax savings for payment to TRA Holders			85
Property and equipment
RELATED PARTY TRANSACTIONS
Purchases from related party vendors	$ 700,000	400,000	1,400,000	600,000
Inventory and consumables
RELATED PARTY TRANSACTIONS
Purchases from related party vendors			200,000	100,000
Inventory and consumables | Maximum
RELATED PARTY TRANSACTIONS
Purchases from related party vendors	100,000	100,000
Rent of certain equipment or other services
RELATED PARTY TRANSACTIONS
Purchases from related party vendors	800,000	100,000	1,700,000	400,000
Management, consulting and other services
RELATED PARTY TRANSACTIONS
Purchases from related party vendors	$ 500,000	$ 400,000	$ 1,700,000	$ 1,500,000

INCOME TAXES (Details)

INCOME TAXES (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
INCOME TAXES
Effective Income tax (as percent)	(12.80%)	0.10%	(1.60%)	0.10%
Statutory tax rate (as a percent)	35.00%		35.00%
Tax benefit (expense)	$ (294,000)	$ 26,000	$ (326,000)	$ 392,000
Liability or expense			$ 0		$ 0

NONCONTROLLING INTERESTS (Detai

NONCONTROLLING INTERESTS (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016
Effects of changes in noncontrolling interests on equity
Net loss attributable to Select Energy Services, Inc. and its Predecessor	$ 1,224	$ (7,164)	$ (285,359)
Transfers from noncontrolling interests:
Increase in additional paid-in capital as a result of the contribution of proceeds from the IPO to SEC holdings, LLC in exchange for common units		87,835
Increase in additional paid-in capital as a result of the cotribution of assets acquired to SES Holdings, LLC in exchange for common units		4,360
Increase in contributed capital due to purchase of noncontrolling interest			135
Change to equity from net loss attributable to Select Energy Services, Inc. and its Predecessor and transfers from noncontrollig interests		$ 85,031	$ (285,224)

EARNINGS PER SHARE (Details)

EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Calculation of basic and diluted earnings per share:
Antidilutive shares	597,749		977,352
Net loss	$ 2,593	$ (35,204)	$ (20,177)	$ (289,235)
Less: Net (income) loss attributable to noncontrolling interests	(1,369)	273	13,013	3,876
Net income (loss) attributable to Select Energy Services, Inc.	1,224		(7,164)	(285,359)
Predecessor
Calculation of basic and diluted earnings per share:
Less: Net (income) loss attributable to noncontrolling interests		$ 34,931		$ 285,359
Class A-1 common stock
Calculation of basic and diluted earnings per share:
Net income (loss) attributable to Select Energy Services, Inc.			$ (2,679)
Weighted average shares outstanding, basic			9,671,795
Net income (loss) per share attributable to common stockholders, basis			$ (0.28)
Weighted average shares outstanding, diluted			9,671,795
Net income (loss) per share attributable to common stockholders, diluted			$ (0.28)
Class A common stock
Calculation of basic and diluted earnings per share:
Net income (loss) attributable to Select Energy Services, Inc.	$ 1,224		$ (4,485)
Weighted average shares outstanding, basic	30,336,923		16,189,997
Net income (loss) per share attributable to common stockholders, basis	$ 0.04		$ (0.28)
Weighted average shares outstanding, diluted	30,357,572		16,189,997
Net income (loss) per share attributable to common stockholders, diluted	$ 0.04		$ (0.28)
Class B common stock
Calculation of basic and diluted earnings per share:
Weighted average shares outstanding, basic	38,462,541		38,462,541
Weighted average shares outstanding, diluted	38,462,541		38,462,541

SEGMENT INFORMATION (Details)

SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)segment	Sep. 30, 2016USD ($)	Dec. 31, 2016USD ($)
SEGMENT INFORMATION
Number of operating segments | segment			3
Number of reportable segments | segment			3
Assets	$ 552,749		$ 552,749		$ 405,066
Segment information
Revenue	153,880	$ 73,907	388,254	$ 215,665
Income (loss) before taxes	2,299	(35,178)	(20,503)	(288,843)
Depreciation and amortization	23,795	21,976	68,456	75,518
Capital Expenditures	27,104	5,031	72,182	29,582
Income (Loss) from operations	2,457	(31,266)	(21,960)	(277,639)
Other income (expense), net	326	431	3,342	588
Water Solutions
SEGMENT INFORMATION
Assets	448,585		448,585		324,171
Segment information
Revenue	125,142	61,082	311,645	173,294
Income (loss) before taxes	9,844		5,652	(264,416)
Depreciation and amortization	19,433	17,690	55,623	61,574
Capital Expenditures	22,260	4,668	57,273	28,533
Income (Loss) from operations		(28,278)
Accommodations and Rentals
SEGMENT INFORMATION
Assets	50,057		50,057		38,874
Segment information
Revenue	15,974	5,881	39,056	19,750
Income (loss) before taxes	(304)		(3,813)	(8,303)
Depreciation and amortization	2,908	2,644	8,367	8,197
Capital Expenditures	3,541	268	8,311	834
Income (Loss) from operations		(2,786)
Wellsite Completion and Construction Services
SEGMENT INFORMATION
Assets	38,827		38,827		29,994
Segment information
Revenue	13,301	7,156	38,951	23,098
Income (loss) before taxes	(2)		56	(3,820)
Depreciation and amortization	1,079	1,279	3,154	4,103
Capital Expenditures	1,303	95	6,598	215
Income (Loss) from operations		(1,325)
Elimination
Segment information
Revenue	(537)	(212)	(1,398)	(477)
Corporate
SEGMENT INFORMATION
Assets	15,280		15,280		$ 12,027
Segment information
Income (loss) before taxes	(7,081)	1,123	(23,855)	(1,100)
Depreciation and amortization	375	363	1,312	1,644
Material reconciling items
Segment information
Income (Loss) from operations	9,538	(32,389)	1,895	(276,539)
Interest expense, net	(484)	(4,343)	(1,885)	(11,792)
Other income (expense), net	$ 326	$ 431	$ 3,342	$ 588

SUBSEQUENT EVENTS - (Details)

SUBSEQUENT EVENTS - (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	Jun. 30, 2018	Nov. 01, 2017	Sep. 30, 2017	Jul. 18, 2017	Dec. 31, 2016	Dec. 20, 2016
Rockwater
Completion of the Merger
Conversion rate per share				$ 0.7777
Class A common stock
Completion of the Merger
Par value			$ 0.01		$ 0.01
Class A-1 common stock
Completion of the Merger
Par value			0.01		0.01	$ 0.01
Class B common stock
Completion of the Merger
Par value			$ 0.01		$ 0.01
Subsequent Event
Completion of the Merger
Shares issued in Merger Agreement		37.3
Subsequent Event | Senior secured credit facility
New Credit Agreement
Maximum borrowing capacity		$ 300
Additional borrowing capacity		$ 150
Time frame for increasing borrowing capacity		3 years
Percentage of borrwoing base allowed		35.00%
Margin (as a percent)		2.00%
Subsequent Event | Senior secured credit facility | Maximum
New Credit Agreement
Percentage of borrwoing base allowed		30.00%
Subsequent Event | Senior secured credit facility | LIBOR
New Credit Agreement
Margin (as a percent)	1.75%	1.00%
Subsequent Event | Senior secured credit facility | LIBOR | Minimum
New Credit Agreement
Margin (as a percent)		1.50%
Subsequent Event | Senior secured credit facility | LIBOR | Maximum
New Credit Agreement
Margin (as a percent)		2.00%
Subsequent Event | Senior secured credit facility | Federal Funds Rate
New Credit Agreement
Margin (as a percent)		0.50%
Subsequent Event | Senior secured credit facility | Base Rate Advances
New Credit Agreement
Margin (as a percent)	0.75%
Subsequent Event | Senior secured credit facility | Base Rate Advances | Minimum
New Credit Agreement
Margin (as a percent)		0.50%
Subsequent Event | Senior secured credit facility | Base Rate Advances | Maximum
New Credit Agreement
Margin (as a percent)		1.00%
Subsequent Event | Senior secured credit facility | Eligible billed receivables
New Credit Agreement
Borrowing base (as a percent)		85.00%
Subsequent Event | Senior secured credit facility | Eligible unbilled receivables
New Credit Agreement
Borrowing base (as a percent)		75.00%
Subsequent Event | Senior secured credit facility | Eligible inventory
New Credit Agreement
Borrowing base (as a percent)		70.00%
Subsequent Event | Senior secured credit facility | Net recovery percentage
New Credit Agreement
Borrowing base (as a percent)		85.00%
Subsequent Event | Senior secured credit facility | Criteria for distributions, scenario one
New Credit Agreement
Lookback period		30 days
Percentage outstanding		25.00%
Base amount		$ 37.5
Subsequent Event | Senior secured credit facility | Criteria for distributions, scenario two
New Credit Agreement
Lookback period		30 days
Percentage outstanding		20.00%
Base amount		$ 30
Fixed charge coverage ratio		1.00%
Subsequent Event | Senior secured credit facility | Coverage Ratio Criteria
New Credit Agreement
Lookback period		60 days
Percentage outstanding		10.00%
Base amount		$ 15
Fixed charge coverage ratio		100.00%
Subsequent Event | Senior secured credit facility | Letter of credit
New Credit Agreement
Maximum borrowing capacity		$ 40
Subsequent Event | Senior secured credit facility | Swingline loan
New Credit Agreement
Maximum borrowing capacity		$ 30
Subsequent Event | Class A common stock | Rockwater
Completion of the Merger
Par value		$ 0.01
Conversion rate per share		$ 0.7652
Shares issued in Merger Agreement		25.9
Subsequent Event | Class A-1 common stock | Rockwater
Completion of the Merger
Par value		$ 0.01
Subsequent Event | Class A-2 common stock | Rockwater
Completion of the Merger
Par value		$ 0.01
Shares issued in Merger Agreement		6.7
Subsequent Event | Class B common stock | Rockwater
Completion of the Merger
Par value		$ 0.01
Shares issued in Merger Agreement		4.4