Liberty Energy (LBRT) 10-Q 1 Nov 18 2018 Q3 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 31, 2018
Class of Stock [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Trading Symbol	LBRT
Entity Registrant Name	Liberty Oilfield Services Inc.
Entity Central Index Key	1,694,028
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Shares of Class A Common Stock
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		70,110,361
Shares of Class B Common Stock
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		45,207,372

Condensed Consolidated and Comb

Condensed Consolidated and Combined Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 87,077	$ 16,321
Accounts receivable—trade	241,346	195,961
Accounts receivable—related party	4,213	3,984
Unbilled revenue	80,233	58,784
Unbilled revenue—related party	0	59
Inventories	55,836	55,524
Prepaid and other current assets	33,356	21,396
Total current assets	502,061	352,029
Property and equipment, net	583,942	494,776
Other assets	15,030	5,298
Total assets	1,101,033	852,103
Current liabilities:
Accounts payable	95,624	66,846
Accrued liabilities:
Accrued vendor invoices	49,712	78,646
Operational accruals	21,538	32,208
Accrued salaries and benefits	27,487	24,990
Deferred revenue	750	9,231
Accrued interest and other	8,909	6,573
Accrued liabilities—related party	0	2,000
Current portion of long-term debt, net of discount of $1,370 and $1,739, respectively	817	11
Total current liabilities	204,837	220,505
Long-term debt, net of discount of $4,137 and $6,466, respectively, less current portion	106,267	196,346
Deferred tax liability	44,042	0
Payable pursuant to tax receivable agreement	2,291	0
Total liabilities	357,437	416,851
Commitments & contingencies (Note 12)
Redeemable common units	0	42,486
Members’ equity:
Members’ equity	0	392,766
Stockholders’ equity:
Preferred Stock, $0.01 par value, 10,000 shares authorized and none issued and outstanding	0	0
Common Stock:
Additional paid in capital	311,772	0
Retained earnings	103,820	0
Total stockholders’ equity	416,745	0
Noncontrolling interest	326,851	0
Total equity	743,596	392,766
Total liabilities and equity	1,101,033	852,103
Class A, $0.01 par value, 400,000,000 shares authorized and 67,110,361 issued and outstanding as of September 30, 2018 and none issued and outstanding as of December 31, 2017
Common Stock:
Common stock, par value $0.01	671	0
Class B, $0.01 par value, 400,000,000 shares authorized and 48,207,372 issued and outstanding as of September 30, 2018 and none issued and outstanding as of December 31, 2017
Common Stock:
Common stock, par value $0.01	$ 482	$ 0

Condensed Consolidated and Co_2

Condensed Consolidated and Combined Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 17, 2018	Dec. 31, 2017
Current portion of long-term debt, discount	$ 1,370		$ 1,739
Long-term debt, discount	$ 4,137		$ 6,466
Preferred stock, par value (in dollars per share)	$ 0.01		$ 0.01
Preferred stock, shares authorized (in shares)	10,000		10,000
Preferred stock, shares issued (in shares)	0		0
Preferred stock, shares outstanding (in shares)	0		0
Shares of Class A Common Stock
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0
Common stock, shares authorized (in shares)	400,000,000		0
Common stock, shares issued (in shares)	67,110,361		0
Common stock, shares outstanding (in shares)	67,110,361	69,975,174	0
Shares of Class B Common Stock
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0
Common stock, shares authorized (in shares)	400,000,000		0
Common stock, shares issued (in shares)	48,207,372	48,207,372	0
Common stock, shares outstanding (in shares)	48,207,372	48,207,372	0

Condensed Consolidated and Co_3

Condensed Consolidated and Combined Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue:
Revenue	$ 552,525	$ 436,333	$ 1,671,707	$ 1,020,291
Revenue—related parties	6,252	5,520	10,314	20,681
Total revenue	558,777	441,853	1,682,021	1,040,972
Operating costs and expenses:
Cost of services (exclusive of depreciation and amortization shown separately below)	418,867	328,434	1,251,163	807,693
General and administrative	24,659	22,245	73,648	59,351
Depreciation and amortization	32,305	24,164	90,927	55,831
Loss (gain) on disposal of assets	701	21	1,266	(12)
Total operating costs and expenses	476,532	374,864	1,417,004	922,863
Operating income	82,245	66,989	265,017	118,109
Other expense:
Interest expense	(3,648)	(3,326)	(13,682)	(6,528)
Interest expense related party	0	0	0	(761)
Total interest expense	(3,648)	(3,326)	(13,682)	(7,289)
Net income before income taxes	78,597	63,663	251,335	110,820
Income tax expense	12,229	0	36,238	0
Net income	66,368	63,663	215,097	110,820
Less: Net income attributable to Predecessor, prior to Corporate Reorganization	0	63,663	8,705	110,820
Less: Net income attributable to noncontrolling interests	32,275	0	99,028	0
Net income attributable to Liberty Oilfield Services Inc. stockholders	$ 34,093	$ 0	$ 107,364	$ 0
Net income attributable to Liberty Oilfield Services Inc. stockholders per common share:
Basic (in dollars per share)	$ 0.50		$ 1.56
Diluted (in dollars per share)	$ 0.49		$ 1.53
Weighted average common shares outstanding:
Basic (in shares)	68,548		68,823
Diluted (in shares)	118,470		118,426

Condensed Consolidated and Co_4

Condensed Consolidated and Combined Statement of Changes in Equity (Unaudited) - USD ($) $ in Thousands	Total	Members’ Equity	Additional Paid in Capital	Retained Earnings	Total Stockholders’ equity	Noncontrolling Interest	Shares of Class A Common Stock	Shares of Class A Common StockCommon Stock	Shares of Class B Common Stock	Shares of Class B Common StockCommon Stock
Beginning Balance at Dec. 31, 2017	$ 392,766	$ 392,766
Beginning balance (in shares) at Dec. 31, 2017							0		0
Beginning balance at Dec. 31, 2017	392,766
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Return on redeemable common units	(149)	(149)
Net income (loss)	8,705	8,705
Ending Balance at Jan. 17, 2018		401,322
Ending balance (in shares) at Jan. 17, 2018							69,975,174	0	48,207,372	0
Ending balance at Jan. 17, 2018	401,322		$ 0	$ 0	$ 0	$ 0		$ 0		$ 0
Beginning Balance at Dec. 31, 2017	392,766	392,766
Beginning balance (in shares) at Dec. 31, 2017							0		0
Beginning balance at Dec. 31, 2017	392,766
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	107,364
Ending Balance at Sep. 30, 2018	0	0
Ending balance (in shares) at Sep. 30, 2018							67,110,361	67,110,000	48,207,372	48,207,000
Ending balance at Sep. 30, 2018	743,596		311,772	103,820	416,745	326,851		$ 671		$ 482
Beginning Balance at Jan. 17, 2018		401,322
Beginning balance (in shares) at Jan. 17, 2018							69,975,174	0	48,207,372	0
Beginning balance at Jan. 17, 2018	401,322		0	0	0	0		$ 0		$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exchange of Liberty LLC Units for Class A Common Stock and Class B Common Stock and extinguishment of Redeemable Common Units	46,544	(401,322)	446,824	0	447,866	0		$ 560		$ 482
Exchange of Liberty LLC Units for Class A Common Stock and Class B Common Stock and extinguishment of Redeemable Common Units (shares)								55,986,000		48,207,000
Net deferred tax liability due to corporate reorganization	(28,620)		(28,620)		(28,620)
Issuance of Class A Common Stock, net of underwriter discount and offering costs	220,260		220,117		220,260			$ 143
Issuance of Class A Common Stock, net of underwriter discount and offering costs (shares)								14,340,000
Redemption of Legacy Ownership, net of underwriter discount	(25,897)		(25,881)		(25,897)			$ (16)
Redemption of Legacy Ownership, net of underwriting discount (shares)								(1,609,000)
Issuance of restricted stock	0		(13)		0			$ 13
Issuance of restricted stock (shares)								1,258,000
Liability due to tax receivable agreement	(2,291)		(2,291)		(2,291)
Initial allocation of noncontrolling interest of Liberty LLC effective on the date of the IPO	0		(261,844)		(261,844)	261,844
Distributions paid to noncontrolling interest unitholders	(17,359)					(17,359)
Restricted stock forfeited	(1)				(1)			$ (1)
Restricted stock forfeited (shares)								(22,000)
Stock based compensation expense	3,122		3,122		3,122
$0.05/LLC Unit distribution paid to noncontrolling interest unitholders	(2,410)					(2,410)
Dividend declared ($0.05 / share of Class A Common Stock)	(3,544)			(3,544)	(3,544)
Share repurchase	(53,922)		(39,642)		(39,670)	(14,252)		$ (28)
Share repurchase (shares)								(2,843,000)
Net income (loss)	206,392			107,364	107,364	99,028
Ending Balance at Sep. 30, 2018	0	$ 0
Ending balance (in shares) at Sep. 30, 2018							67,110,361	67,110,000	48,207,372	48,207,000
Ending balance at Sep. 30, 2018	$ 743,596		$ 311,772	$ 103,820	$ 416,745	$ 326,851		$ 671		$ 482

Condensed Consolidated and Co_5

Condensed Consolidated and Combined Statement of Changes in Equity (Unaudited) (Parenthetical)	Sep. 30, 2018$ / shares
Noncontrolling Interest
Price per unit (in dollars per share)	$ 0.05
Shares of Class A Common Stock | Common Stock
Dividend declared (in dollars per share)	$ 0.05

Condensed Consolidated and Co_6

Condensed Consolidated and Combined Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 215,097	$ 110,820
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	90,927	55,831
Loss (gain) on disposal of assets	1,266	(12)
Amortization of debt issuance costs	3,442	1,679
Inventory write-down	3,389	259
Stock based compensation expense	3,122	0
Deferred tax expense	15,246	0
Changes in operating assets and liabilities:
Accounts receivable and unbilled revenue	(66,834)	(138,951)
Accounts receivable and unbilled revenue—related party	(170)	(234)
Inventories	(3,701)	(13,955)
Prepaid and other current assets	(31,699)	(15,872)
Accounts payable and accrued liabilities	(6,458)	114,248
Accounts payable and accrued liabilities—related party	0	1,294
Net cash provided by operating activities	223,627	115,107
Cash flows from investing activities:
Capital expenditures	(187,079)	(252,351)
Proceeds from disposal of assets	3,138	1,054
Net cash used in investing activities	(183,941)	(251,297)
Cash flows from financing activities:
Proceeds from issuance of common stock, net of underwriter discount	230,174	0
Redemption of LLC Units from Legacy Owners	(25,897)	0
Proceeds from borrowings on term loan, net of discount	0	171,500
Repayments of borrowings on term loan	(61,972)	(57,000)
Proceeds from borrowings on line-of-credit	0	110,559
Repayments of borrowings on line-of-credit	(30,000)	(104,000)
Proceeds from Liberty Oilfield Services Holdings LLC	2,115	0
Distribution and dividend paid to noncontrolling interest unitholders and Class A common stock shareholders	(5,861)	0
Share Repurchase	(53,922)	0
Proceeds from related party bridge loans	0	60,000
Payments on capital lease obligations	0	(119)
Payments of debt issuance costs	(282)	(8,747)
Proceeds from issuance of redeemable common units	0	39,794
Payments for redemption of redeemable common units		(62,739)
Distributions paid to noncontrolling interest unitholders	(17,358)	0
Payment of deferred equity offering costs	(5,927)	(3,397)
Net cash provided by financing activities	31,070	145,851
Net increase (decrease) in cash and cash equivalents	70,756	9,661
Cash and cash equivalents—beginning of period	16,321	11,484
Cash and cash equivalents—end of period	87,077	21,145
Supplemental disclosure of cash flow information:
Cash paid for income taxes	19,829	0
Cash paid for interest	10,760	5,132
Non-cash investing and financing activities:
Capital expenditures included in accounts payable and accrued liabilities	16,105	17,877
Related party bridge loans exchanged for Redeemable Class 2 Common Units	$ 0	$ 60,679

Organization and Basis of Prese

Organization and Basis of Presentation	9 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	Organization and Basis of Presentation Organization Liberty Oilfield Services Inc. (the “Company”) was incorporated as a Delaware corporation on December 21, 2016, to become a holding corporation for Liberty Oilfield Services New HoldCo LLC (“Liberty LLC”) and its subsidiaries upon completion of a corporate reorganization (as detailed below, the “Corporate Reorganization”) and planned initial public offering of the Company (“IPO”). The Company has no material assets other than its ownership in Liberty LLC. Prior to the Corporate Reorganization, Liberty Oilfield Services Holdings LLC (“Liberty Holdings”) wholly owned Liberty Oilfield Services LLC (“LOS”) and LOS Acquisition CO I LLC (“ACQI” and, together with LOS, the “Predecessor”), which includes the assets and liabilities of LOS Odessa RE Investments, LLC (“Odessa”) and LOS Cibolo RE Investments, LLC (“Cibolo”). Following the Corporate Reorganization, Liberty LLC wholly owns the Predecessor. Effective March 22, 2018, the assets of ACQI were contributed into LOS and ACQI was dissolved. The Company, together with its subsidiaries, is a multi-basin provider of hydraulic fracturing services, with a focus on deploying the latest technologies in the technically demanding oil and gas reservoirs in which it operates, principally in North Dakota, Colorado, Wyoming and Texas. Corporate Reorganization In connection with the IPO, the Company completed a series of organizational transactions, including the following: • Liberty Holdings contributed all of its assets to Liberty LLC in exchange for Liberty LLC Units (as defined below); • Liberty Holdings liquidated and distributed to its then-existing owners (the “Legacy Owners”) Liberty LLC Units pursuant to the terms of the limited liability company agreement of Liberty Holdings and the Master Reorganization Agreement dated as of January 11, 2018, by and among the Company, Liberty Holdings, Liberty LLC, and the other parties named therein (the “Master Reorganization Agreement”); • Certain of the Legacy Owners directly or indirectly contributed all or a portion of their Liberty LLC Units to the Company in exchange for 55,685,027 shares of our Class A common stock, par value $0.01 per share (the “Class A Common Stock”), and 1,258,514 restricted shares of Class A Common Stock. Subsequent to the initial exchange, 1,609,122 shares of Class A Common Stock were redeemed for an aggregate price of $25.9 million , upon the exercise of the underwriters’ overallotment option; • the Company issued, at par, the Legacy Owners that continued to own Liberty LLC Units (the “Liberty Unit Holders”) an aggregate amount of 48,207,372 shares of our Class B common stock, par value $0.01 per share (the “Class B Common Stock”); and • the Company contributed the net proceeds it received from the IPO to Liberty LLC in exchange for additional Liberty LLC Units such that the Company held a total number of Liberty LLC Units equal to the number of shares of Class A Common Stock outstanding immediately following the IPO. Initial Public Offering On January 17, 2018 the Company completed its IPO of 14,640,755 shares of its Class A Common Stock at a public offering price of $17.00 per share, of which 14,340,214 shares were offered by the Company and 300,541 were offered by the selling shareholder. The Company received $220.3 million net proceeds from the IPO, after deducting approximately $13.4 million in underwriting discounts and commissions and $10.1 million of other offering costs. The Company did not receive any proceeds from the sale of the shares of Class A Common Stock by the selling shareholder. The Company used $25.9 million of net proceeds to redeem ownership interests in Liberty LLC from the Legacy Owners. The Company contributed the remaining net proceeds to Liberty LLC in exchange for units in Liberty LLC (the “Liberty LLC Units”). Liberty LLC used a portion of these net proceeds (i) to repay outstanding borrowings and accrued interest under the Predecessor’s ABL Facility (as defined herein), totaling approximately $30.1 million , (ii) to repay 35% of the Predecessor’s outstanding borrowings, accrued interest and prepayment premium under the Term Loan Facility (as defined herein), totaling approximately $62.5 million and (iii) for general corporate purposes, including repayment of additional indebtedness and funding a portion of 2018 and other future capital expenditures. As of September 30, 2018 , the Company owned 58.2% of Liberty LLC. Basis of Presentation The accompanying unaudited condensed consolidated and combined financial statements were prepared using generally accepted accounting principles in the United States of America (“GAAP”) for interim financial information and the instructions to Form 10-Q and Regulation S-X. Accordingly, these financial statements do not include all information or notes required by generally accepted accounting principles for annual financial statements and should be read together with the annual financial statements included in the Company's 2017 Annual Report on Form 10-K (the “Annual Report”). The accompanying unaudited condensed consolidated and combined financial statements and related notes present the consolidated financial position, results of operations, cash flows, and equity of the Company as of and for the three and nine months ended September 30, 2018 and the combined financial position, results of operations, and cash flows of the Predecessor as of December 31, 2017 and for the three and nine months ended September 30, 2017 . The interim data includes all adjustments, consisting only of normal recurring adjustments, necessary for a fair presentation of the results for the interim period. The results of operations for the three and nine months ended September 30, 2018 are not necessarily indicative of the results of operations expected for the entire fiscal year ended December 31, 2018 . All intercompany amounts have been eliminated in the presentation of these unaudited condensed consolidated and combined financial statements. Comprehensive income is not reported due to the absence of items of other comprehensive income or loss during the periods presented. The condensed consolidated and combined financial statements include financial data at historical cost as the contribution of assets is considered to be a reorganization of entities under common control. The condensed consolidated and combined financial statements may not be indicative of the actual level of assets, liabilities and costs that would have been incurred by the Predecessor if it had operated as an independent, publicly-traded company during the periods prior to the IPO or of the costs expected to be incurred in the future. In the opinion of management, the adjustments necessary for a fair presentation of the combined financial statements in accordance with GAAP have been made. Such adjustments are of a normal recurring nature. The unaudited condensed consolidated and combined financial statements for periods prior to January 17, 2018, reflect the historical results of the Predecessor. The unaudited condensed consolidated financial statements include the amounts of the Company and all majority owned subsidiaries where the Company has the ability to exercise control.

Significant Accounting Policies

Significant Accounting Policies	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Significant Accounting Policies	Significant Accounting Policies Revenue Recognition Effective January 1, 2018, the Company adopted a comprehensive new revenue recognition standard, Accounting Standard Codification (“ASC”) Topic 606- Revenue from Contracts with Customers . The details of the significant changes to accounting policies resulting from the adoption of the new standard are set out below. The Company adopted the standard using a modified retrospective method; accordingly, the comparative information for the three and nine months ended September 30, 2017 has not been adjusted and continues to be reported under the previous revenue standard. The adoption of this standard did not have a material impact to the condensed consolidated financial position, reported revenue, results of operations or cash flows as of and for the three and nine months ended September 30, 2018 . Under the new standard, revenue recognition is based on the transfer of control, or the customer’s ability to benefit from the services and products in an amount that reflects the consideration expected to be received in exchange for those services and products. In recognizing revenue for services and products, the transaction price is determined from sales orders or contracts with customers. Revenue is recognized at the completion of each fracturing stage, and in most cases the price at the end of each stage is fixed, however, in limited circumstances contracts may contain variable consideration. Variable consideration typically may relate to discounts, price concessions and incentives. We estimate variable consideration based on the amount of consideration we expect to receive. The Company accrues revenue on an ongoing basis to reflect updated information for variable consideration as performance obligations are met. The Company also assesses customers’ ability and intention to pay, which is based on a variety of factors including historical payment experience and financial condition. Payment terms and conditions vary by contract type, although terms generally include a requirement of payment within 30 to 45 days. From time to time, the Company may require partial payment in advance from new customers to secure credit or from existing customers in order to secure additional hydraulic fracturing services. Initially, such payments are recorded in the accompanying condensed consolidated and combined financial statements as deferred revenue, and upon performance of the agreed services, the Company recognizes revenue consistent with its revenue recognition policy described above. As of September 30, 2018 , the Company had $0.8 million recorded as deferred revenue related to the unearned portion of a prepayment from an existing customer to secure additional services from a new fleet by the end of 2017. The new fleet commenced services in December 2017, and the Company applies the prepayment in accordance with the customer agreement as services are performed. During the three and nine months ended September 30, 2018 , the Company recognized $3.1 million and $8.5 million of the prepayment to revenue, respectively. Fleet Start-up Costs The Company incurs start-up costs to commission a new fleet or district. These costs include hiring and training of personnel, and acquisition of consumable parts and tools. Start-up costs are expensed as incurred, and are reflected in general and administrative expenses in the combined statement of operations. Start-up costs for the three and nine months ended September 30, 2018 were $2.2 million and $8.8 million , respectively, related to zero and three new fleets deployed during each respective period. Start-up costs for the three and nine months ended September 30, 2017 were $1.9 million and $10.8 million , respectively, related to one and seven new fleets deployed during each respective period. The total amount of start-up costs incurred for the commissioning of each new fleet depends primarily on the number and timing of hiring additional personnel to staff such fleets, and such costs may not be entirely incurred in the same period as the fleet is deployed. The terms and conditions of the Credit Facilities, defined herein, between the Company and its lenders provides for the add-back of costs or expenses incurred in connection with the acquisition, deployment and opening of any new hydraulic fracturing fleet or district in the computation of certain financial covenants. (See Note 5). Recently Adopted Accounting Standards In August 2018, the Financial Accounting Standards Board (“FASB”) issued ASU 2018-15, “Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40),” which amends ASC 350-40 to address a customer's accounting for implementation costs incurred in a cloud computing arrangement (“CCA”) that is a service contract. ASU 2018-15 aligns the accounting for costs incurred to implement a CCA that is a service arrangement with the guidance on capitalizing costs associated with developing or obtaining internal-use software. Specifically, ASU 2018-15 amends ASC 350-40 to include in its scope implementation costs of a CCA that is a service contract and clarifies that a customer should apply ASC 350-40 to determine which implementation costs should be capitalized. The update is effective for fiscal years beginning after December 15, 2019, and early adoption is permitted. The Company adopted this standard for the September 30, 2018 reporting period using the prospective approach. The adoption of this standard did not materially impact the condensed consolidated financial statements as of and for the three and nine months ended September 30, 2018 . In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers (Topic 606),” which outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers. This ASU sets forth a five-step model for determining when and how revenue is recognized. Under the model, an entity is required to recognize revenue to depict the transfer of goods or services to a customer at an amount reflecting the consideration it expects to receive in exchange for those goods or services. Additional disclosures are required to describe the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts. The Company adopted this standard on January 1, 2018 using the modified retrospective method. The Company did not record a cumulative effect adjustment to the opening balance of retained earnings, as no adjustment was necessary. The adoption of this standard did not impact the Company’s reported revenue, net income or cash flows. In May 2017, the FASB issued ASU 2017-09, “Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting”, which provides guidance to increase clarity and reduce both diversity in practice and cost and complexity when applying the existing accounting guidance on changes to the terms or conditions of a share-based payment award. The amendments in ASU 2017-09 require an entity to account for the effects of a modification unless all the following conditions are met: (i) the fair value of the modified award is the same as the fair value of the original award immediately before the original award is modified; (ii) the vesting conditions of the modified award are the same as the vesting conditions of the original award immediately before the original award is modified; and (iii) the classification of the modified award as an equity instrument or a liability instrument is the same as the classification of the original award immediately before the original award is modified. The guidance in ASU 2017-09 is applied prospectively. The amendments in ASU 2017-09 are effective for annual periods beginning after December 15, 2017, including interim periods within those annual periods. The Company’s adoption of this guidance effective January 1, 2018, did not materially impact its condensed consolidated and combined financial statements. Recently Issued Accounting Standards In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842),” which sets out the principles for the recognition, measurement, presentation and disclosure of leases for both lessees and lessors. The new standard requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a purchase financed by the lessee. This classification will determine whether lease expense is recognized based on an effective interest method or on a straight-line basis over the term of the lease, respectively. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. Leases with a term of 12 months or less may be accounted for similarly to existing guidance for operating leases today. ASU 2016-02 is expected to impact the Company’s consolidated and combined financial statements as the Company has certain operating and real property lease arrangements for which it is the lessee. The Company plans to adopt the standard effective January 1, 2019. The Company is currently finalizing its selection of an adoption method, selecting a new lease system, and evaluating the impact the adoption of this standard will have on its condensed consolidated and combined financial statements. In June 2016, the FASB issued ASU 2016-13, “Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments,” which is effective for fiscal years and interim periods within fiscal years beginning after December 15, 2019, with a modified-retrospective approach to be used for implementation. ASU 2016-13 changes the impairment model for most financial assets and certain other instruments. Specifically, this new guidance requires using a forward looking, expected loss model for trade and other receivables, held-to-maturity debt securities, loans and other instruments. This will replace the currently used model and may result in an earlier recognition of allowance for losses. The Company is currently evaluating the impact the adoption of this standard will have on its condensed consolidated and combined financial statements.

Inventories

Inventories	9 Months Ended
	Sep. 30, 2018
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories consist of the following: September 30, December 31, ($ in thousands) 2018 2017 Proppants $ 23,907 $ 30,523 Chemicals 10,325 10,660 Maintenance parts 21,604 14,341 $ 55,836 $ 55,524 During the three month period ended June 30, 2018, the lower of cost or net realizable value analysis resulted in the Company recording a write-down to inventory carrying values of $3.4 million , included as a component in cost of services in the condensed consolidated statements of income for the nine month period ended September 30, 2018 .

Property and Equipment

Property and Equipment	9 Months Ended
	Sep. 30, 2018
Property, Plant and Equipment [Abstract]
Property and Equipment	Property and Equipment Property and equipment consist of the following: Estimated September 30, December 31, ($ in thousands) 2018 2017 Land N/A $ 5,400 $ 4,495 Field services equipment 2-7 738,338 572,096 Vehicles 4-7 61,261 60,815 Buildings and facilities 5-30 27,603 24,260 Office equipment, furniture, and software 2-7 6,173 5,879 838,775 667,545 Less accumulated depreciation and amortization (286,346 ) (198,453 ) 552,429 469,092 Construction in-progress N/A 31,513 25,684 $ 583,942 $ 494,776 Depreciation expense for the three months ended September 30, 2018 and 2017 was $32.3 million and $24.2 million , respectively. During the nine months ended September 30, 2018 and 2017 , the Company recognized depreciation expense of $90.9 million and $55.8 million , respectively.

Debt

Debt	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Debt	Debt Debt consists of the following: September 30, December 31, ($ in thousands) 2018 2017 Term Loan Outstanding $ 112,591 $ 174,562 Revolving Line of Credit — 30,000 Deferred financing costs and original issue discount (5,507 ) (8,205 ) Total debt, net of deferred financing costs and original issue discount $ 107,084 $ 196,357 Current portion of long-term debt, net of discount $ 817 $ 11 Long-term debt, net of discount and current portion 106,267 196,346 $ 107,084 $ 196,357 On September 19, 2017, the Company entered into two new credit agreements for a revolving line of credit up to $250.0 million (the “ABL Facility”) and a $175.0 million term loan (the “Term Loan Facility”, and together with the ABL Facility the “Credit Facilities”). Following is a description of the ABL Facility and the Term Loan Facility. ABL Facility Under the terms of the ABL Facility, up to $250.0 million may be borrowed, subject to certain borrowing base limitations based on a percentage of eligible accounts receivable and inventory. As of September 30, 2018 , the borrowing base was calculated to be $250.0 million , and the Company had no borrowings outstanding, except for a letter of credit in the amount of $0.3 million , with $249.7 million of remaining availability. Borrowings under the ABL Facility bear interest at LIBOR or a base rate, plus an applicable LIBOR margin of 1.5% to 2.0% or base rate margin of 0.5% to 1.0% , as defined in the ABL Facility credit agreement. The unused commitment is subject to an unused commitment fee of 0.375% to 0.5% . Interest and fees are payable in arrears at the end of each month, or, in the case of LIBOR loans, at the end of each interest period. The ABL Facility matures on the earlier of (i) September 19, 2022 and (ii) to the extent the debt under the Term Loan Facility remains outstanding, 90 days prior to the final maturity of the Term Loan Facility, which matures on September 19, 2022. Borrowings under the ABL Facility are collateralized by accounts receivable and inventory, and further secured by the Company, Liberty LLC and R/C IV Non-U.S. LOS Corp., a Delaware corporation and a subsidiary of the Company, as parent guarantors. Term Loan Facility The Term Loan Facility provides for a $175.0 million term loan, of which $112.6 million remained outstanding as of September 30, 2018 . Amounts outstanding bear interest at LIBOR or a base rate, plus an applicable margin of 7.625% or 6.625% , respectively, and the weighted average rate on borrowings was 9.8% as of September 30, 2018 . The Company is required to make quarterly principal payments of 1% per annum of the initial principal balance, commencing on December 31, 2017, with final payment due at maturity on September 19, 2022. The Term Loan Facility is collateralized by the fixed assets of LOS and its subsidiaries, and is further secured by the Company, Liberty LLC and R/C IV Non-U.S. LOS Corp., a Delaware corporation and a subsidiary of the Company, as parent guarantors. The Credit Facilities include certain non-financial covenants, including but not limited to restrictions on incurring additional debt and certain distributions. Moreover, the ability of the Company to incur additional debt and to make distributions is dependent on maintaining a maximum leverage ratio. The Term Loan Facility requires mandatory prepayments upon certain dispositions of property or issuance of other indebtedness, as defined, and annually a percentage of excess cash flow ( 25% to 50% , depending on leverage ratio, of consolidated net income less capital expenditures and other permitted payments, commencing with the year ending December 31, 2018). Certain mandatory prepayments and optional prepayments are subject to a prepayment premium of 3% of the prepaid principal declining annually to 1% during the first three years of the term of the Term Loan Facility. The Credit Facilities are not subject to financial covenants unless liquidity, as defined in the respective credit agreements, drops below a specified level. Under the ABL Facility, the Company is required to maintain a minimum fixed charge coverage ratio, as defined in the credit agreement governing the ABL Credit Facility, of 1.0 to 1.0 for each period if excess availability is less than 10% of the borrowing base or $12.5 million , whichever is greater. Under the Term Loan Facility, the Company is required to maintain a minimum fixed charge coverage ratio, as defined, of 1.2 to 1.0 for each trailing twelve-month period if the Company’s liquidity, as defined, is less than $25.0 million for at least five consecutive business days. The Company was in compliance with these covenants as of September 30, 2018 . Maturities of debt are as follows: ($ in thousands) Year Ending September 30, 2019 $ 2,188 2020 1,750 2021 1,750 2022 106,903 2023 — $ 112,591

Redeemable Common Units

Redeemable Common Units	9 Months Ended
	Sep. 30, 2018
Temporary Equity Disclosure [Abstract]
Redeemable Common Units	Redeemable Common Units During February 2017, ACQI received $39.8 million in cash from Liberty Holdings in exchange for 40,000,000 redeemable common units of ACQI which accrue a return of 8% per annum (the “Redeemable Common Units”). The Redeemable Common Units were redeemable at the option of the holder on the later of (A) the earlier of an initial public offering or March 23, 2020 and (B) the second business day after all principal and interest outstanding under the ABL Facility have been paid in full and commitments thereunder are terminated. In accordance with ASC 505, “Equity”, due to their conditional redemption feature, the Redeemable Common Units were classified as temporary equity in the accompanying combined balance sheet as of December 31, 2017 . The Redeemable Common Units were deemed extinguished and satisfied in full in connection with the Corporate Reorganization (see Note 1).

Fair Value Measurements and Fin

Fair Value Measurements and Financial Instruments	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements and Financial Instruments	Fair Value Measurements and Financial Instruments The fair values of the Company’s assets and liabilities represent the amounts that would be received to sell those assets or that would be paid to transfer those liabilities in an orderly transaction at the reporting date. These fair value measurements maximize the use of observable inputs. However, in situations where there is little, if any, market activity for the asset or liability at the measurement date, the fair value measurement reflects the Company’s own judgments about the assumptions that market participants would use in pricing the asset or liability. The Company discloses the fair values of its assets and liabilities according to the quality of valuation inputs under the following hierarchy: • Level 1 Inputs: Quoted prices (unadjusted) in an active market for identical assets or liabilities. • Level 2 Inputs: Inputs other than quoted prices that are directly or indirectly observable. • Level 3 Inputs: Unobservable inputs that are significant to the fair value of assets or liabilities. The classification of an asset or liability is based on the lowest level of input significant to its fair value. Those that are initially classified as Level 3 are subsequently reported as Level 2 when the fair value derived from unobservable inputs is inconsequential to the overall fair value, or if corroborating market data becomes available. Assets and liabilities that are initially reported as Level 2 are subsequently reported as Level 3 if corroborating market data is no longer available. Transfers occur at the end of the reporting period. There were no transfers into or out of Levels 1, 2 and 3 during the nine months ended September 30, 2018 and 2017 . The Company’s financial instruments consist of cash and cash equivalents, accounts receivable, accounts payable, accrued liabilities, long-term debt, and capital lease obligations. These financial instruments do not require disclosure by level. The carrying values of all the Company’s financial instruments included in the accompanying balance sheets approximated or equaled their fair values at September 30, 2018 and December 31, 2017 . • The carrying values of cash and cash equivalents, accounts receivable and accounts payable (including accrued liabilities) approximated fair value at September 30, 2018 and December 31, 2017 , due to their short-term nature. • The carrying value of amounts outstanding under long-term debt agreements with variable rates approximated fair value at September 30, 2018 and December 31, 2017 , as the effective interest rates approximated market rates. Nonfinancial assets The Company estimates fair value to perform impairment tests as required on long-lived assets. The inputs used to determine such fair value are primarily based upon internally developed cash flow models and would generally be classified within Level 3 in the event that such assets were required to be measured and recorded at fair value within the combined financial statements. There were no such measurements required as of September 30, 2018 and December 31, 2017 . Credit Risk The Company’s financial instruments exposed to concentrations of credit risk consist primarily of cash and cash equivalents, and trade receivables. The Company’s cash balances on deposit with financial institutions total $87.1 million and $16.3 million as of September 30, 2018 and December 31, 2017 , respectively, which exceeded FDIC insured limits. The Company regularly monitors these institutions’ financial condition. The majority of the Company’s customers have stated payment terms of 45 days or less. As of September 30, 2018 and December 31, 2017 , two and one customers accounted for 28% and 22% of total accounts receivable and unbilled revenue, respectively. The Company mitigates the associated credit risk by performing credit evaluations and monitoring the payment patterns of its customers. During the three months ended September 30, 2018 and 2017 , one and two customers accounted for 12% and 37% of total revenue, respectively. During the nine months ended September 30, 2018 and 2017 , one customer accounted for 13% and 29% of total revenue, respectively. As of September 30, 2018 and December 31, 2017 , the Company had no provision for doubtful accounts.

Equity

Equity	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Equity	Equity Preferred Stock As of September 30, 2018 the Company had 10,000 shares of preferred stock authorized, par value $0.01 , with none issued and outstanding. If issued, each class or series of preferred stock will cover the number of shares and will have the powers, preferences, rights, qualifications, limitations and restrictions determined by the Company's board of directors, which may include, among others, dividend rights, liquidation preferences, voting rights, conversion rights, preemptive rights and redemption rights. Except as provided by law or in a preferred stock designation, the holders of preferred stock will not be entitled to vote at or receive notice of any meeting of shareholders. Class A Common Stock The Company had a total of 67,110,361 shares of Class A Common Stock outstanding as of September 30, 2018 , which includes 922,604 shares of restricted stock. Holders of Class A Common Stock are entitled to one vote per share on all matters to be voted upon by the stockholders and are entitled to ratably receive dividends when and if declared by the Company’s board of directors. Class B Common Stock The Company had a total 48,207,372 shares of Class B Common Stock outstanding as of September 30, 2018 . Holders of the Class B Common Stock are entitled to one vote per share on all matters to be voted upon by stockholders. Holders of Class A Common Stock and Class B Common Stock vote together as a single class on all matters presented to the Company’s stockholders for their vote or approval, except with respect to amendment of certain provisions of the Company’s certificate of incorporation that would alter or change the powers, preferences or special rights of the Class B Common Stock so as to affect them adversely, which amendments must be by a majority of the votes entitled to be cast by the holders of the shares affected by the amendment, voting as a separate class, or as otherwise required by applicable law. Holders of Class B Common Stock do not have any right to receive dividends, unless the dividend consists of Class B Common Stock or of rights, options, warrants or other securities convertible or exercisable into or exchangeable for shares of Class B Common Stock paid proportionally with respect to each outstanding share of Class B Common Stock and a dividend consisting of shares of Class A Common Stock or of rights, options, warrants or other securities convertible or exercisable into or exchangeable for shares of Class A Common Stock on the same terms is simultaneously paid to the holders of Class A Common Stock. Holders of Class B Common Stock do not have any right to receive a distribution upon liquidation or winding up of the Company. The Liberty LLC Unit holders generally have the right (the “Redemption Right”) to cause Liberty LLC to acquire all or a portion of their Liberty LLC Units (and a corresponding number of shares of Class B Common Stock), for, at Liberty LLC’s election, (i) shares of Class A Common Stock, at a redemption ratio of one share of Class A Common Stock for each Liberty LLC Unit (and corresponding share of Class B Common Stock) redeemed, (subject to conversion rate adjustments for stock splits, stock dividends, and reclassifications and other similar transactions) or (ii) an equivalent amount of cash. Alternatively, upon the exercise of the Redemption Right, the Company (instead of Liberty LLC) will have the right (the “Call Right”) to, for administrative convenience, acquire each tendered Liberty LLC Unit directly from the redeeming Liberty Unit holder for, at its election, (x) one share of Class A Common Stock or (y) an equivalent amount of cash. In addition, upon a change of control of the Company, the Company has the right to require each holder of Liberty LLC Units (other than the Company) to exercise its Redemption Right with respect to some or all of such unitholder’s Liberty LLC Units. In connection with any redemption of Liberty LLC Units pursuant to the Redemption Right or the Call Right, the corresponding number of shares of Class B Common Stock will be canceled. Net Income per Share Basic net income per share measures the performance of an entity over the reporting period. Diluted net income per share measures the performance of an entity over the reporting period while giving effect to all potentially dilutive common shares that were outstanding during the period. The Company uses the “if-converted” method to determine the potential dilutive effect of its Class B Common Stock and the treasury stock method to determine the potential dilutive effect of outstanding restricted stock and restricted stock units. The following table reflects the allocation of net income to common stockholders and net income per share computations for the periods indicated based on a weighted average number of common stock outstanding for period subsequent to the Corporate Reorganization on January 17, 2018: (In thousands, except per share data) Three Months Ended September 30, 2018 Nine Months Ended September 30, 2018 Basic Net Income Per Share Numerator: Net income attributable to Liberty Oilfield Services Inc. Stockholders $ 34,093 $ 107,364 Denominator: Basic weighted average shares outstanding 68,548 68,823 Basic net income per share attributable to Liberty Oilfield Services Inc. Stockholders $ 0.50 $ 1.56 Diluted Net Income Per Share Numerator: Net income attributable to Liberty Oilfield Services Inc. Stockholders $ 34,093 $ 107,364 Effect of exchange of the shares of Class B Common stock for shares of Class A Common Stock 23,755 74,242 Diluted net income attributable to Liberty Oilfield Services Inc. Stockholders $ 57,848 $ 181,606 Denominator: Basic weighted average shares outstanding 68,548 68,823 Effect of dilutive securities: Restricted stock 933 972 Restricted stock units 782 424 Class B Common Stock 48,207 48,207 Diluted weighted average shares outstanding 118,470 118,426 Diluted net income per share attributable to Liberty Oilfield Services Inc. Stockholders $ 0.49 $ 1.53 LLC Interest Issuance Prior to the IPO and Corporate Reorganization, as described in Note 1, Liberty Holdings issued membership interests to investors in exchange for cash consideration. Total member contributions as of December 31, 2017 were $275.7 million , net of commitment and issuance fees. On January 17, 2018, in connection with the Corporate Reorganization, these membership interests were exchanged for Liberty LLC Units. See Note 1 for additional information regarding the Corporate Reorganization. Unit-Based Compensation Prior to the IPO and Corporate Reorganization, Liberty Holdings issued Class B units of Liberty Holdings (“Legacy Units”) to certain eligible employees of the Company. The Legacy Units were non-voting, except with respect to such matters that units are entitled to vote as a matter of law. In such cases, each Legacy Unit entitled the holder to 1/1000th of one vote. Certain Legacy Units granted to eligible participants had an assigned benchmark value and were subject to vesting in accordance with the terms of each award letter. Upon termination of the holder’s employment for any reason, Liberty Holdings had the right, but not the obligation, to repurchase from the recipient those vested Legacy Units at fair value. The Company recognizes compensation expense for equity-based Legacy Units issued to employees based on the grant-date fair value of the awards and each award’s requisite service period. With the assistance from a third-party valuation expert, the Predecessor determined that the Legacy Units issued to employees were deemed to have a de minimis grant-date fair value based on their assigned benchmark values. In connection with the Corporate Reorganization, the unvested Legacy Units were exchanged for 1,258,514 shares of restricted stock with the same terms and requisite vesting conditions as the Legacy Units. There was no change in the classification of the awards, and the fair value of the awards was the same immediately before and after the exchange. As such, in accordance with ASU 2017-07, modification accounting was not applicable, and the restricted stock awards continue to be recognized at the grant date fair value of the Legacy Units. Restricted Stock Awards Restricted stock awards are awards of Class A Common Stock that are subject to restrictions on transfer and to a risk of forfeitures if the award recipient is no longer an employee or director of the Company for any reason prior to the lapse of the restrictions. The following table summarizes the Company’s unvested restricted stock activity for the nine months ended September 30, 2018 : Number of Shares Grant Date Fair Value per Share (1) Shares of Restricted Stock Issued in Exchange for Legacy Units 1,258,514 — Vested (314,462 ) — Forfeited (21,448 ) — Outstanding at September 30, 2018 922,604 $ — (1) As discussed above the shares of restricted stock retain the grant date fair value of the Legacy Units. Long Term Incentive Plan On January 11, 2018, the Company adopted the Long Term Incentive Plan (“LTIP”) to incentivize employees, officers, directors and other service providers of the Company and its affiliates. The LTIP provides for the grant, from time to time, at the discretion of the Company's board of directors or a committee thereof, of stock options, stock appreciation rights, restricted stock, restricted stock units, stock awards, dividend equivalents, other stock-based awards, cash awards, substitute awards and performance awards. Subject to adjustment in the event of certain transaction or changes of capitalization in accordance with the LTIP, 12,908,734 shares of Class A Common Stock have been reserved for issuance pursuant to awards under the LTIP. Class A Common stock subject to an award that expires or is canceled, forfeited, exchanged, settled in cash or otherwise terminated without delivery of shares and shares withheld to pay the exercise price of, or to satisfy the withholding obligations with respect to, an award will again be available for delivery pursuant to other awards under the LTIP. Restricted Stock Units Restricted stock units (RSUs) granted pursuant to the LTIP, if they vest, will be settled in shares of the Company’s Class A Common Stock. RSUs were granted with vesting terms up to five years. Changes in non-vested RSUs outstanding under the LTIP during the nine months ended September 30, 2018 were as follows: Number of Units Weighted Average Grant Date Fair Value per Unit Non-vested as of December 31, 2017 — $ — Granted 912,876 19.97 Vested — — Forfeited (6,336 ) 20.07 Outstanding at September 30, 2018 906,540 $ 19.97 Stock-based compensation is included in cost of services and general and administrative expenses in the Company’s condensed consolidated and combined statements of income. The Company recognized stock based compensation expense of $1.9 million and $3.1 million for the three and nine months ended September 30, 2018 . The Company recognized no stock based compensation expense prior to the Corporate Reorganization. There was approximately $15.1 million of unrecognized compensation expense relating to outstanding RSUs as of September 30, 2018 . The unrecognized compensation expense will be recognized on a straight-line basis over the weighted average remaining vesting period of 2.5 years. Dividends On August 1, 2018, the Company declared its first quarterly cash dividend of $0.05 per share of Class A Common Stock. Liberty LLC paid a distribution of $5.9 million , or $0.05 per LLC Unit, to all Liberty LLC unitholders as of September 6, 2018, $3.5 million of which was paid to the Company. The Company used the proceeds of the distribution to pay the dividend to all holders of shares of Class A Common Stock as of September 6, 2018, which totaled $3.5 million . Additionally, the Company accrued $0.1 million of dividends payable related to restricted shares and RSUs to be paid upon vesting. Dividends related to forfeited restricted shares and RSUs will be forfeited. Share Repurchase Program On September 10, 2018 the Company's board of directors authorized a share repurchase plan to repurchase up to $100.0 million of the Company's Class A Common Stock through September 30, 2019. During the three months ended September 30, 2018, Liberty LLC purchased and retired 2,843,365 LLC Units from the Company for $53.9 million , and the Company repurchased and retired 2,843,365 shares of Class A Common Stock for $53.9 million , or $18.96 average price per share. The total remaining authorized amount available for future repurchases of Class A Common Stock under the share repurchase program was $46.1 million as of September 30, 2018 . Of the total amount of Class A Common Stock repurchased, 2,491,160 shares were repurchased pursuant to a Stock Purchase and Sale Agreement, dated as of September 14, 2018, by and among the Company, R/C Energy IV Direct Partnership, L.P., R/C IV Liberty Holdings, L.P. and Riverstone/Carlyle Energy Partners IV, L.P. (collectively, the "Riverstone Sellers"). For further details of this related party transaction see Note 11. The Company accounts for the purchase price of repurchased common shares in excess of par value ( $0.01 per share of Class A Common Stock) as a reduction of additional paid-in capital, and will continue to do so until additional paid-in capital is reduced to zero. Thereafter, any excess purchase price will be recorded as a reduction to retained earnings.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company is a corporation and is subject to U.S. federal, state and local income tax on its share of Liberty LLC’s taxable income. As a result of the IPO and Corporate Reorganization, the Company recorded deferred tax assets and liabilities for the difference between the book value of assets and liabilities for financial reporting purposes and those amounts applicable for income tax purposes. Deferred tax assets have been recorded for tax attributes contributed to the Company as part of the Corporate Reorganization. Deferred tax liabilities of $28.6 million have been recorded in connection with the Liberty LLC Units acquired through reorganization. The initial deferred tax liability is recorded as a long term liability and additional paid in capital on the condensed consolidated balance sheet as of September 30, 2018 . The effective combined U.S. federal and state income tax rate applicable to the Company for the period commencing on January 17, 2018, the date of the Corporate Reorganization, through September 30, 2018 was 14.4% . The Company’s effective tax rate is significantly less than the statutory federal tax rate of 21.0% primarily due to the shortened taxable period, as the Company was a pass-through entity prior to the IPO, and because no taxes are payable by the Company for the noncontrolling interest’s share of Liberty LLC’s pass through results for federal, state and local income tax reporting. The Company recognized income tax expense of $36.2 million for the period commencing on January 17, 2018, the date of the Corporate Reorganization, through September 30, 2018 , and $12.2 million during the three months ended September 30, 2018 . Tax Receivable Agreements In connection with the IPO, on January 17, 2018, the Company entered into two Tax Receivable Agreements (the “TRAs”) with the R/C Energy IV Direct Partnership, L.P. and the Legacy Owners that continued to own Liberty LLC Units (each such person and any permitted transferee, a “TRA Holder” and together, the “TRA Holders”). The TRAs generally provide for the payment by the Company of 85% of the net cash savings, if any, in U.S. federal, state, and local income tax and franchise tax (computed using simplifying assumptions to address the impact of state and local taxes) that the Company actually realizes (or is deemed to realize in certain circumstances) in periods after the IPO as a result, as applicable to each TRA Holder, of (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 Liberty LLC Units in connection with the IPO or pursuant to the exercise of the Redemption Right or the Company’s Call Right, (ii) any net operating losses available to the Company as a result of the Corporate Reorganization, and (iii) 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 the TRAs. The term of each TRA commenced on January 17, 2018, and will continue until all such tax benefits that are subject to such TRA have been utilized or expired, unless the Company experiences a change of control (as defined in the TRAs, which includes certain mergers, asset sales and other forms of business combinations) or the TRAs are terminated early (at the Company’s election or as a result of its breach), and the Company makes the termination payments specified in such TRA. The amounts payable, as well as the timing of any payments, under the TRAs are dependent upon significant future events and assumptions, including the timing of the redemptions of Liberty LLC Units, the price of our Class A Common Stock at the time of each redemption, the extent to which such redemptions are taxable transactions, the amount of the redeeming unit holder’s tax basis in its Liberty LLC Units at the time of the relevant redemption, the depreciation and amortization periods that apply to the increase in tax basis, the amount of net operating losses available to the Company as a result of the Corporate Reorganization, the amount and timing of taxable income the Company generates in the future, the U.S. federal income tax rate then applicable, and the portion of the Company’s payments under the TRAs that constitute imputed interest or give rise to depreciable or amortizable tax basis. As of September 30, 2018 , there have been no payments associated with the TRA. Prior to the Corporate Reorganization, one of the Legacy Owners contributed a portion of its member interest in Liberty Holdings to R/C IV Non-U.S. LOS Corp (“R/C IV”). Subsequently, in conjunction with the Corporate Reorganization, R/C IV was contributed to Liberty LLC. R/C IV had net operating loss carryforwards totaling $10.9 million for federal income tax purposes and $10.9 million for certain state income tax purposes. As a result of the Company being in a net income position and the expected utilization of deferred tax assets, the tax attributes contributed to the Company included a deferred tax asset of $2.6 million . As of September 30, 2018 , the Company recognized a $2.3 million payable pursuant to the TRAs, or 85% of the deferred tax asset that is expected to be realized.

Defined Contribution Plan

Defined Contribution Plan	9 Months Ended
	Sep. 30, 2018
Retirement Benefits [Abstract]
Defined Contribution Plan	Defined Contribution Plan The Company sponsors a 401(k) defined contribution retirement plan covering eligible employees. The Company makes matching contributions, which were temporarily suspended in May 2015, but were resumed in April 2017 at a rate of $1.00 for each $1.00 of employee contribution, subject to a cap of 3% of the employee’s salary. In October 2017, the cap on these contributions was increased to 6% of the employee’s base salary. Contributions made by the Company were $10.3 million and $2.4 million for the nine months ended September 30, 2018 and 2017 , respectively, and $3.6 million and $1.2 million for the three months ended September 30, 2018 and 2017 , respectively.

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions During September 2018, the Company repurchased 2,491,160 shares of Class A Common Stock from the Riverstone Sellers, at a weighted average purchase price of $18.96 per share, pursuant to the share repurchase program (see Note 8 - Equity - Share Repurchase Program ). In connection with the Corporate Reorganization, the Company engaged in transactions with affiliates (see Note 1) including entering into two tax receivable agreements with affiliates (see Note 9). Also in conjunction with the Corporate Reorganization, Liberty Holdings contributed $2.1 million of assets to Liberty LLC, Redeemable Common Units in the amount of $42.6 million were settled (see Note 6) and $2.0 million of accrued advisory fees due to Riverstone/Carlyle Energy Partners IV, L.P. ("Riverstone") were settled. In September 2011, Liberty Resources LLC, an oil and gas exploration and production company, and its successor entity (collectively, the “Affiliate”) and LOS, companies with common ownership and management, entered into a services agreement (the “Services Agreement”) whereby the Affiliate was to provide certain administrative support functions to LOS and a master service agreement whereby LOS provides hydraulic fracturing services to the Affiliate at market service rates. The amounts incurred under the Services Agreement by LOS during the three and nine months ended September 30, 2018 , were $0 and $0.2 million , respectively, and $0 during the three and nine months ended September 30, 2017 . There was $0 payable as of September 30, 2018 and December 31, 2017 . During June 2018, the Services Agreement was terminated. The amounts of the Company’s revenue related to hydraulic fracturing services provided to the Affiliate for the three months ended September 30, 2018 and 2017 , was $6.3 and $5.5 million , respectively, and $10.3 million and $20.7 million for the nine months ended September 30, 2018 and 2017 , respectively. As of September 30, 2018 and December 31, 2017 , $4.2 million and $4.0 million , respectively, of the Company’s accounts receivable, and $0 and $0.1 million , respectively, of the Company’s unbilled revenue was with the Affiliate. The Company had an advisory agreement dated December 30, 2011 in which Riverstone was to provide certain administrative advisory services. The service fees incurred during the three months ended September 30, 2018 and 2017 were $0 and $0.3 million , respectively, and $0 and $1.3 million for the nine months ended September 30, 2018 and 2017 , respectively. Fees accrued as of September 30, 2018 and December 31, 2017 were $0 and $2.0 million , respectively. The amount accrued as of December 31, 2017 was settled and the agreement was terminated in connection with the IPO. During 2016 , Liberty Holdings entered into a future commitment to invest and become a noncontrolling minority member in Proppant Express Investments, LLC (“PropX Investments”), the owner of Proppant Express Solutions, LLC (“PropX”), a provider of proppant logistics equipment. LOS is party to a services agreement (the “PropX Services Agreement”) whereby LOS is to provide certain administrative support functions to PropX, and LOS is to purchase and lease proppant logistics equipment from PropX. For the three months ended September 30, 2018 and 2017 , the Company purchased proppant logistics equipment of $0.7 million and $1.9 million , respectively, and leased proppant logistics equipment for $0.7 million and $1.1 million , respectively. For the nine months ended September 30, 2018 and 2017 , the Company made purchases of $2.8 million and $7.7 million , respectively and lease payments of $3.4 million and $2.5 million , respectively. During the three months ended March 31, 2018 , in exchange for a 5% discount, the Company made a prepayment to PropX for rented equipment in the amount of $5.4 million , of which $1.6 million and $3.8 million was recognized as expense to costs of goods sold during the three and nine months ended September 30, 2018 and $1.6 million remains outstanding as of September 30, 2018 , which is reflected in prepaids and other current assets. Receivables from PropX as of September 30, 2018 and December 31, 2017 were $0 . Payables to PropX as of September 30, 2018 and December 31, 2017 were $0.3 million and $0.7 million , respectively.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments & Contingencies Operating Leases The Company leases office space, facilities, equipment, railcars, and vehicles under non-cancelable operating leases. Rent expense for the three months ended September 30, 2018 and 2017 , was $11.7 million and $5.8 million , respectively, and $29.0 million and $15.3 million for the nine months ended September 30, 2018 and 2017 , respectively. Future minimum lease payments are as follows: ($ in thousands) Year Ending September 30, 2019 $ 44,481 2020 38,515 2021 35,888 2022 10,521 2023 4,444 Thereafter 20,796 $ 154,645 Purchase Commitments (tons, per ton, gallons, per gallon and per rail car prices are not in thousands) The Company enters into purchase and supply agreements to secure supply and pricing of proppants and chemicals. As of September 30, 2018 and December 31, 2017 , the agreements commit the Company to purchase 11,362,000 and 10,108,000 tons, respectively, of proppant through December 31, 2021. Amounts above also include commitments to pay for transport fees on minimum amounts of proppants or railcars. Certain proppant supply agreements contain a clause whereby in the event that the Company fails to purchase minimum volumes, as defined in the agreement, during a specific time period, a shortfall fee may apply. There were no shortfalls as of September 30, 2018 . As of September 30, 2018 , the Company has commitments to purchase 23,565,000 gallons of chemicals through December 31, 2020. Future proppant, chemical and rail car commitments are as follows: ($ in thousands) Years ended September 30, 2019 $ 294,009 2020 244,910 2021 102,838 2022 8,077 2023 — $ 649,834 Litigation From time to time, the Company is subject to legal and administrative proceedings, settlements, investigations, claims and actions. The Company’s assessment of the likely outcome of litigation matters is based on its judgment of a number of factors including experience with similar matters, past history, precedents, relevant financial and other evidence and facts specific to the matter. Notwithstanding the uncertainty as to the final outcome, based upon the information currently available, management does not believe any matters in aggregate will have a material adverse effect on its financial position or results of operations. On February 23, 2017, SandBox Logistics, LLC and Oren Technologies, LLC (collectively, “SandBox”) filed suit in the Houston Division of the U.S. District Court for the Southern District of Texas against PropX Investments, PropX and LOS. As described in Note 11, LOS is party to the PropX Services Agreement. SandBox alleges that LOS willfully infringes multiple U.S. patents and has breached an agreement between SandBox and LOS by “directing, controlling, and funding” inter partes review (“IPR”) requests before the U.S. Patent and Trademark Office (“USPTO”). In July 2018, SandBox requested permission from the court to allege additional breach of contract claims against LOS, including alleged breaches of a confidentiality agreement and an exclusive purchasing covenant. The court denied these requests in September 2018. SandBox seeks both monetary and injunctive relief from the court, as well as attorney’s fees and costs. LOS intends to vigorously defend against the claims brought by SandBox. The Company cannot predict with any degree of certainty the outcome of the suit.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On October 4, 2018, certain Liberty LLC Unit holders exercised their Redemption Rights and exchanged 3.0 million shares of Class B Common Stock for 3.0 million shares of Class A Common Stock of the Company. This exchange resulted in an increase to the ownership percentage of Liberty LLC owned by the Company. The Company expects to record a decrease to the Company's deferred tax liability as a result. In addition, the Company expects to record an increase to the payable pursuant to tax receivable agreement. On October 23, 2018, the Company's board of directors approved a quarterly dividend of $0.05 per share of Class A Common Stock, and a distribution of $0.05 per Liberty LLC Unit, to be paid on December 20, 2018 to holders of record as of December 6, 2018. The Company will use the proceeds from the Liberty LLC distribution to pay the dividend.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated and combined financial statements were prepared using generally accepted accounting principles in the United States of America (“GAAP”) for interim financial information and the instructions to Form 10-Q and Regulation S-X. Accordingly, these financial statements do not include all information or notes required by generally accepted accounting principles for annual financial statements and should be read together with the annual financial statements included in the Company's 2017 Annual Report on Form 10-K (the “Annual Report”). The accompanying unaudited condensed consolidated and combined financial statements and related notes present the consolidated financial position, results of operations, cash flows, and equity of the Company as of and for the three and nine months ended September 30, 2018 and the combined financial position, results of operations, and cash flows of the Predecessor as of December 31, 2017 and for the three and nine months ended September 30, 2017 . The interim data includes all adjustments, consisting only of normal recurring adjustments, necessary for a fair presentation of the results for the interim period. The results of operations for the three and nine months ended September 30, 2018 are not necessarily indicative of the results of operations expected for the entire fiscal year ended December 31, 2018 . All intercompany amounts have been eliminated in the presentation of these unaudited condensed consolidated and combined financial statements. Comprehensive income is not reported due to the absence of items of other comprehensive income or loss during the periods presented. The condensed consolidated and combined financial statements include financial data at historical cost as the contribution of assets is considered to be a reorganization of entities under common control. The condensed consolidated and combined financial statements may not be indicative of the actual level of assets, liabilities and costs that would have been incurred by the Predecessor if it had operated as an independent, publicly-traded company during the periods prior to the IPO or of the costs expected to be incurred in the future. In the opinion of management, the adjustments necessary for a fair presentation of the combined financial statements in accordance with GAAP have been made. Such adjustments are of a normal recurring nature. The unaudited condensed consolidated and combined financial statements for periods prior to January 17, 2018, reflect the historical results of the Predecessor. The unaudited condensed consolidated financial statements include the amounts of the Company and all majority owned subsidiaries where the Company has the ability to exercise control.
Revenue Recognition	Revenue Recognition Effective January 1, 2018, the Company adopted a comprehensive new revenue recognition standard, Accounting Standard Codification (“ASC”) Topic 606- Revenue from Contracts with Customers . The details of the significant changes to accounting policies resulting from the adoption of the new standard are set out below. The Company adopted the standard using a modified retrospective method; accordingly, the comparative information for the three and nine months ended September 30, 2017 has not been adjusted and continues to be reported under the previous revenue standard. The adoption of this standard did not have a material impact to the condensed consolidated financial position, reported revenue, results of operations or cash flows as of and for the three and nine months ended September 30, 2018 . Under the new standard, revenue recognition is based on the transfer of control, or the customer’s ability to benefit from the services and products in an amount that reflects the consideration expected to be received in exchange for those services and products. In recognizing revenue for services and products, the transaction price is determined from sales orders or contracts with customers. Revenue is recognized at the completion of each fracturing stage, and in most cases the price at the end of each stage is fixed, however, in limited circumstances contracts may contain variable consideration. Variable consideration typically may relate to discounts, price concessions and incentives. We estimate variable consideration based on the amount of consideration we expect to receive. The Company accrues revenue on an ongoing basis to reflect updated information for variable consideration as performance obligations are met. The Company also assesses customers’ ability and intention to pay, which is based on a variety of factors including historical payment experience and financial condition. Payment terms and conditions vary by contract type, although terms generally include a requirement of payment within 30 to 45 days. From time to time, the Company may require partial payment in advance from new customers to secure credit or from existing customers in order to secure additional hydraulic fracturing services. Initially, such payments are recorded in the accompanying condensed consolidated and combined financial statements as deferred revenue, and upon performance of the agreed services, the Company recognizes revenue consistent with its revenue recognition policy described above.
Fleet Start-up Costs	Fleet Start-up Costs The Company incurs start-up costs to commission a new fleet or district. These costs include hiring and training of personnel, and acquisition of consumable parts and tools. Start-up costs are expensed as incurred, and are reflected in general and administrative expenses in the combined statement of operations. Start-up costs for the three and nine months ended September 30, 2018 were $2.2 million and $8.8 million , respectively, related to zero and three new fleets deployed during each respective period. Start-up costs for the three and nine months ended September 30, 2017 were $1.9 million and $10.8 million , respectively, related to one and seven new fleets deployed during each respective period. The total amount of start-up costs incurred for the commissioning of each new fleet depends primarily on the number and timing of hiring additional personnel to staff such fleets, and such costs may not be entirely incurred in the same period as the fleet is deployed. The terms and conditions of the Credit Facilities, defined herein, between the Company and its lenders provides for the add-back of costs or expenses incurred in connection with the acquisition, deployment and opening of any new hydraulic fracturing fleet or district in the computation of certain financial covenants.
Recently Adopted and Issued Accounting Standards	Recently Adopted Accounting Standards In August 2018, the Financial Accounting Standards Board (“FASB”) issued ASU 2018-15, “Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40),” which amends ASC 350-40 to address a customer's accounting for implementation costs incurred in a cloud computing arrangement (“CCA”) that is a service contract. ASU 2018-15 aligns the accounting for costs incurred to implement a CCA that is a service arrangement with the guidance on capitalizing costs associated with developing or obtaining internal-use software. Specifically, ASU 2018-15 amends ASC 350-40 to include in its scope implementation costs of a CCA that is a service contract and clarifies that a customer should apply ASC 350-40 to determine which implementation costs should be capitalized. The update is effective for fiscal years beginning after December 15, 2019, and early adoption is permitted. The Company adopted this standard for the September 30, 2018 reporting period using the prospective approach. The adoption of this standard did not materially impact the condensed consolidated financial statements as of and for the three and nine months ended September 30, 2018 . In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers (Topic 606),” which outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers. This ASU sets forth a five-step model for determining when and how revenue is recognized. Under the model, an entity is required to recognize revenue to depict the transfer of goods or services to a customer at an amount reflecting the consideration it expects to receive in exchange for those goods or services. Additional disclosures are required to describe the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts. The Company adopted this standard on January 1, 2018 using the modified retrospective method. The Company did not record a cumulative effect adjustment to the opening balance of retained earnings, as no adjustment was necessary. The adoption of this standard did not impact the Company’s reported revenue, net income or cash flows. In May 2017, the FASB issued ASU 2017-09, “Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting”, which provides guidance to increase clarity and reduce both diversity in practice and cost and complexity when applying the existing accounting guidance on changes to the terms or conditions of a share-based payment award. The amendments in ASU 2017-09 require an entity to account for the effects of a modification unless all the following conditions are met: (i) the fair value of the modified award is the same as the fair value of the original award immediately before the original award is modified; (ii) the vesting conditions of the modified award are the same as the vesting conditions of the original award immediately before the original award is modified; and (iii) the classification of the modified award as an equity instrument or a liability instrument is the same as the classification of the original award immediately before the original award is modified. The guidance in ASU 2017-09 is applied prospectively. The amendments in ASU 2017-09 are effective for annual periods beginning after December 15, 2017, including interim periods within those annual periods. The Company’s adoption of this guidance effective January 1, 2018, did not materially impact its condensed consolidated and combined financial statements. Recently Issued Accounting Standards In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842),” which sets out the principles for the recognition, measurement, presentation and disclosure of leases for both lessees and lessors. The new standard requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a purchase financed by the lessee. This classification will determine whether lease expense is recognized based on an effective interest method or on a straight-line basis over the term of the lease, respectively. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. Leases with a term of 12 months or less may be accounted for similarly to existing guidance for operating leases today. ASU 2016-02 is expected to impact the Company’s consolidated and combined financial statements as the Company has certain operating and real property lease arrangements for which it is the lessee. The Company plans to adopt the standard effective January 1, 2019. The Company is currently finalizing its selection of an adoption method, selecting a new lease system, and evaluating the impact the adoption of this standard will have on its condensed consolidated and combined financial statements. In June 2016, the FASB issued ASU 2016-13, “Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments,” which is effective for fiscal years and interim periods within fiscal years beginning after December 15, 2019, with a modified-retrospective approach to be used for implementation. ASU 2016-13 changes the impairment model for most financial assets and certain other instruments. Specifically, this new guidance requires using a forward looking, expected loss model for trade and other receivables, held-to-maturity debt securities, loans and other instruments. This will replace the currently used model and may result in an earlier recognition of allowance for losses. The Company is currently evaluating the impact the adoption of this standard will have on its condensed consolidated and combined financial statements.

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2018
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories consist of the following: September 30, December 31, ($ in thousands) 2018 2017 Proppants $ 23,907 $ 30,523 Chemicals 10,325 10,660 Maintenance parts 21,604 14,341 $ 55,836 $ 55,524

Property and Equipment (Tables)

Property and Equipment (Tables)	9 Months Ended
	Sep. 30, 2018
Property, Plant and Equipment [Abstract]
Property and Equipment	Property and equipment consist of the following: Estimated September 30, December 31, ($ in thousands) 2018 2017 Land N/A $ 5,400 $ 4,495 Field services equipment 2-7 738,338 572,096 Vehicles 4-7 61,261 60,815 Buildings and facilities 5-30 27,603 24,260 Office equipment, furniture, and software 2-7 6,173 5,879 838,775 667,545 Less accumulated depreciation and amortization (286,346 ) (198,453 ) 552,429 469,092 Construction in-progress N/A 31,513 25,684 $ 583,942 $ 494,776

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Schedule of Debt	Debt consists of the following: September 30, December 31, ($ in thousands) 2018 2017 Term Loan Outstanding $ 112,591 $ 174,562 Revolving Line of Credit — 30,000 Deferred financing costs and original issue discount (5,507 ) (8,205 ) Total debt, net of deferred financing costs and original issue discount $ 107,084 $ 196,357 Current portion of long-term debt, net of discount $ 817 $ 11 Long-term debt, net of discount and current portion 106,267 196,346 $ 107,084 $ 196,357
Schedule of Maturities of Long-term Debt	Maturities of debt are as follows: ($ in thousands) Year Ending September 30, 2019 $ 2,188 2020 1,750 2021 1,750 2022 106,903 2023 — $ 112,591

Equity (Tables)

Equity (Tables)	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table reflects the allocation of net income to common stockholders and net income per share computations for the periods indicated based on a weighted average number of common stock outstanding for period subsequent to the Corporate Reorganization on January 17, 2018: (In thousands, except per share data) Three Months Ended September 30, 2018 Nine Months Ended September 30, 2018 Basic Net Income Per Share Numerator: Net income attributable to Liberty Oilfield Services Inc. Stockholders $ 34,093 $ 107,364 Denominator: Basic weighted average shares outstanding 68,548 68,823 Basic net income per share attributable to Liberty Oilfield Services Inc. Stockholders $ 0.50 $ 1.56 Diluted Net Income Per Share Numerator: Net income attributable to Liberty Oilfield Services Inc. Stockholders $ 34,093 $ 107,364 Effect of exchange of the shares of Class B Common stock for shares of Class A Common Stock 23,755 74,242 Diluted net income attributable to Liberty Oilfield Services Inc. Stockholders $ 57,848 $ 181,606 Denominator: Basic weighted average shares outstanding 68,548 68,823 Effect of dilutive securities: Restricted stock 933 972 Restricted stock units 782 424 Class B Common Stock 48,207 48,207 Diluted weighted average shares outstanding 118,470 118,426 Diluted net income per share attributable to Liberty Oilfield Services Inc. Stockholders $ 0.49 $ 1.53
Nonvested Restricted Stock Shares Activity	The following table summarizes the Company’s unvested restricted stock activity for the nine months ended September 30, 2018 : Number of Shares Grant Date Fair Value per Share (1) Shares of Restricted Stock Issued in Exchange for Legacy Units 1,258,514 — Vested (314,462 ) — Forfeited (21,448 ) — Outstanding at September 30, 2018 922,604 $ — (1) As discussed above the shares of restricted stock retain the grant date fair value of the Legacy Units.
Schedule of Nonvested Restricted Stock Units Activity	Changes in non-vested RSUs outstanding under the LTIP during the nine months ended September 30, 2018 were as follows: Number of Units Weighted Average Grant Date Fair Value per Unit Non-vested as of December 31, 2017 — $ — Granted 912,876 19.97 Vested — — Forfeited (6,336 ) 20.07 Outstanding at September 30, 2018 906,540 $ 19.97

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	Future minimum lease payments are as follows: ($ in thousands) Year Ending September 30, 2019 $ 44,481 2020 38,515 2021 35,888 2022 10,521 2023 4,444 Thereafter 20,796 $ 154,645
Other Commitments	Future proppant, chemical and rail car commitments are as follows: ($ in thousands) Years ended September 30, 2019 $ 294,009 2020 244,910 2021 102,838 2022 8,077 2023 — $ 649,834

Organization and Basis of Pre_2

Organization and Basis of Presentation - Sale Of Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	Jan. 17, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Subsidiary, Sale of Stock [Line Items]
Ownership interest redemption		$ 53,922	$ 0
ABL Credit Facility
Subsidiary, Sale of Stock [Line Items]
Repayments of debt	$ 30,100
Term Loan Facility
Subsidiary, Sale of Stock [Line Items]
Repayments of debt	$ 62,500
Repayments of debt, percent	35.00%
Shares of Class A Common Stock
Subsidiary, Sale of Stock [Line Items]
Number of common shares sold (in shares)	55,685,027
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01		$ 0
Shares redeemed (in shares)	1,609,122
Shares of Class A Common Stock | IPO
Subsidiary, Sale of Stock [Line Items]
Number of common shares sold (in shares)	14,640,755
Price per share (in dollars per share)	$ 17
Consideration received	$ 220,300
Underwriting discounts and commissions and offering costs	13,400
Other offering costs	$ 10,100
Shares of Class A Common Stock | IPO - Shares From Existing Shareholders
Subsidiary, Sale of Stock [Line Items]
Number of common shares sold (in shares)	300,541
Shares of Class B Common Stock
Subsidiary, Sale of Stock [Line Items]
Number of common shares sold (in shares)	48,207,372
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01		$ 0
Restricted Stock | Shares of Class A Common Stock
Subsidiary, Sale of Stock [Line Items]
Number of common shares sold (in shares)	1,258,514
Liberty LLC
Subsidiary, Sale of Stock [Line Items]
Ownership interest redemption	$ 25,900
Liberty Inc. | Shares of Class A Common Stock | IPO
Subsidiary, Sale of Stock [Line Items]
Number of common shares sold (in shares)	14,340,214
Liberty LLC | Liberty LLC
Subsidiary, Sale of Stock [Line Items]
Ownership percentage		58.20%

Significant Accounting Polici_3

Significant Accounting Policies (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)fleet	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)fleet	Dec. 31, 2017USD ($)
Deferred Revenue Arrangement [Line Items]
Customer payment terms			45 days
Deferred revenue	$ 750		$ 750		$ 9,231
Prepayment revenue recognized			3,100	$ 8,500
Start-up costs	$ 2,200	$ 1,900	$ 8,800	$ 10,800
Number of fleets established | fleet		1		7
Minimum
Deferred Revenue Arrangement [Line Items]
Customer payment terms			30 days
Maximum
Deferred Revenue Arrangement [Line Items]
Customer payment terms			45 days

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Inventory [Line Items]
Inventories	$ 55,836		$ 55,524
Inventory write-down	3,389	$ 259
Proppants
Inventory [Line Items]
Inventories	23,907		30,523
Chemicals
Inventory [Line Items]
Inventories	10,325		10,660
Maintenance parts
Inventory [Line Items]
Inventories	$ 21,604		$ 14,341

Property and Equipment (Details

Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 838,775		$ 838,775		$ 667,545
Less accumulated depreciation and amortization	(286,346)		(286,346)		(198,453)
Property and equipment, before construction in-progress, net	552,429		552,429		469,092
Construction in-progress	31,513		31,513		25,684
Property and equipment, net	583,942		583,942		494,776
Depreciation and amortization	32,305	$ 24,164	90,927	$ 55,831
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	5,400		5,400		4,495
Field services equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	738,338		$ 738,338		572,096
Field services equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives			2 years
Field services equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives			7 years
Vehicles
Property, Plant and Equipment [Line Items]
Property and equipment, gross	61,261		$ 61,261		60,815
Vehicles | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives			4 years
Vehicles | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives			7 years
Buildings and facilities
Property, Plant and Equipment [Line Items]
Property and equipment, gross	27,603		$ 27,603		24,260
Buildings and facilities | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives			5 years
Buildings and facilities | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives			30 years
Office equipment, furniture, and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 6,173		$ 6,173		$ 5,879
Office equipment, furniture, and software | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives			2 years
Office equipment, furniture, and software | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives			7 years

Debt - Summary of Debt (Details

Debt - Summary of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt, gross	$ 112,591
Deferred financing costs and original issue discount		$ (5,507)	$ (8,205)
Total debt, net of deferred financing costs and original issue discount	107,084	196,357
Current portion of long-term debt, net of discount	817	11
Long-term debt, net of discount and current portion	106,267	196,346
Term Loan Outstanding
Debt Instrument [Line Items]
Long-term debt, gross	112,591	174,562
Revolving Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	$ 30,000

Debt - Credit Facilities (Detai

Debt - Credit Facilities (Details)	9 Months Ended
	Sep. 30, 2018USD ($)	Dec. 31, 2017USD ($)	Sep. 19, 2017USD ($)agreement
Debt Instrument [Line Items]
Long-term debt, gross	$ 112,591,000
Revolving Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	0	$ 30,000,000
Term Loan | Term Loan Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 175,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Number of credit agreements | agreement			2
Revolving Credit Facility | ABL Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 250,000,000
Current borrowing capacity	$ 250,000,000
Line of credit, maturity, number of days prior maturity of another facility	90 days
Revolving Credit Facility | Revolving Line of Credit | Term Loan Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 175,000,000
Letter of Credit | ABL Credit Facility
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 300,000
Remaining borrowing capacity	$ 249,700,000
Minimum | Revolving Credit Facility | ABL Credit Facility
Debt Instrument [Line Items]
Unused capacity, commitment fee percentage	0.375%
Maximum | Revolving Credit Facility | ABL Credit Facility
Debt Instrument [Line Items]
Unused capacity, commitment fee percentage	0.50%
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Revolving Line of Credit | Term Loan Facility
Debt Instrument [Line Items]
Basis spread on variable rate	7.625%
London Interbank Offered Rate (LIBOR) | Minimum | Revolving Credit Facility | Revolving Line of Credit | ABL Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
London Interbank Offered Rate (LIBOR) | Maximum | Revolving Credit Facility | Revolving Line of Credit | ABL Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
Base Rate | Revolving Credit Facility | Revolving Line of Credit | Term Loan Facility
Debt Instrument [Line Items]
Basis spread on variable rate	6.625%
Base Rate | Minimum | Revolving Credit Facility | Revolving Line of Credit | ABL Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Base Rate | Maximum | Revolving Credit Facility | Revolving Line of Credit | ABL Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%

Debt - Term Loan Facility (Deta

Debt - Term Loan Facility (Details) - USD ($)	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Sep. 19, 2017
Debt Instrument [Line Items]
Long-term debt, gross	$ 112,591,000
Revolving Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	$ 30,000,000
Revolving Credit Facility | ABL Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 250,000,000
Revolving Credit Facility | Revolving Line of Credit | Term Loan Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 175,000,000
Weighted average interest rate	9.80%
Line of credit facility, outstanding balance, quarterly principal payments, percent	1.00%
Line of credit facility, covenant compliance, prepayment minimum, percent	3.00%
Line of credit facility, covenant compliance, prepayment minimum, floor during first three years, percent	1.00%
Line of credit facility, covenant compliance, fixed charge coverage ratio	1.2
Line of credit facility, covenant compliance, liquidity threshold for five consecutive business days	$ 25,000,000
Revolving Credit Facility | Revolving Line of Credit | Term Loan Facility | Minimum
Debt Instrument [Line Items]
Line of credit facility, covenant compliance, annual percentage of excess cash flow	25.00%
Revolving Credit Facility | Revolving Line of Credit | Term Loan Facility | Maximum
Debt Instrument [Line Items]
Line of credit facility, covenant compliance, annual percentage of excess cash flow	50.00%
Revolving Credit Facility | Revolving Line of Credit | Term Loan Facility | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	7.625%
Revolving Credit Facility | Revolving Line of Credit | Term Loan Facility | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate	6.625%
Revolving Credit Facility | Revolving Line of Credit | ABL Credit Facility
Debt Instrument [Line Items]
Line of credit facility, covenant compliance, fixed charge coverage ratio	1
Line of credit facility, covenant compliance, excess availability threshold, percent of borrowing base	10.00%
Line of credit facility, covenant compliance, excess availability threshold, amount	$ 12,500,000
Revolving Credit Facility | Revolving Line of Credit | ABL Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
Revolving Credit Facility | Revolving Line of Credit | ABL Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
Revolving Credit Facility | Revolving Line of Credit | ABL Credit Facility | Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Revolving Credit Facility | Revolving Line of Credit | ABL Credit Facility | Base Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%

Debt - Maturities of Debt (Deta

Debt - Maturities of Debt (Details) $ in Thousands	Sep. 30, 2018USD ($)
Debt Disclosure [Abstract]
2,019	$ 2,188
2,020	1,750
2,021	1,750
2,022	106,903
2,023	0
Long-term debt, gross	$ 112,591

Redeemable Common Units (Detail

Redeemable Common Units (Details) - ACQI - Liberty LLC - Redeemable Common Units $ in Millions	1 Months Ended
	Feb. 28, 2017USD ($)shares
Temporary Equity [Line Items]
Proceeds from issuance of redeemable common units | $	$ 39.8
Temporary equity, shares issued (in shares) | shares	40,000,000
Temporary equity, shares, interest rate	8.00%

Fair Value Measurements and F_2

Fair Value Measurements and Financial Instruments (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash balances on deposit with financial institutions	$ 87,077,000	$ 21,145,000	$ 87,077,000	$ 21,145,000	$ 16,321,000	$ 11,484,000
Customer payment terms			45 days
Allowance for uncollectible accounts	$ 0		$ 0		$ 0
Customer Concentration Risk | Largest Two Customers | Accounts Receivable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Concentration risk, percentage			28.00%
Customer Concentration Risk | Largest Two Customers | Total Revenue
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Concentration risk, percentage		37.00%
Customer Concentration Risk | Largest Customer | Accounts Receivable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Concentration risk, percentage					22.00%
Customer Concentration Risk | Largest Customer | Total Revenue
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Concentration risk, percentage	12.00%		13.00%	29.00%

Equity - Additional Information

Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	Jan. 17, 2018	Dec. 31, 2017	Sep. 30, 2018	Jan. 11, 2018
Subsidiary or Equity Method Investee [Line Items]
Preferred stock, shares authorized (in shares)		10,000	10,000
Preferred stock, par value (in dollars per share)		$ 0.01	$ 0.01
Member contributions		$ 275.7
Shares of Class A Common Stock
Subsidiary or Equity Method Investee [Line Items]
Common stock, shares outstanding (in shares)	69,975,174	0	67,110,361
Number of common shares sold (in shares)	55,685,027
Shares of Class A Common Stock | Long Term Incentive Plan
Subsidiary or Equity Method Investee [Line Items]
Shares reserved for issuance				12,908,734
Shares of Class A Common Stock | Restricted Stock
Subsidiary or Equity Method Investee [Line Items]
Common stock, shares outstanding (in shares)			922,604
Number of common shares sold (in shares)	1,258,514
Shares of Class B Common Stock
Subsidiary or Equity Method Investee [Line Items]
Common stock, shares outstanding (in shares)	48,207,372	0	48,207,372
Number of common shares sold (in shares)	48,207,372

Equity - Earnings Per Share (De

Equity - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	1 Months Ended	3 Months Ended		8 Months Ended	9 Months Ended
	Jan. 17, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income attributable to Liberty Oilfield Services Inc. Stockholders	$ 8,705	$ 34,093	$ 0	$ 206,392	$ 107,364	$ 0
Denominator, Basic [Abstract]
Basic weighted average shares outstanding (in shares)		68,548			68,823
Basic net income per share attributable to Liberty Oilfield Services Inc. Stockholders (in dollars per share)		$ 0.50			$ 1.56
Numerator, Diluted [Abstract]
Net income attributable to Liberty Oilfield Services Inc. Stockholders	$ 8,705	$ 34,093	$ 0	$ 206,392	$ 107,364	$ 0
Effect of exchange of the shares of Class B Common stock for shares of Class A Common Stock		23,755			74,242
Net Income (Loss) Available to Common Stockholders, Diluted		$ 57,848			$ 181,606
Denominator, Diluted [Abstract]
Basic weighted average shares outstanding (in shares)		68,548			68,823
Effect of dilutive securities:
Restricted stock (in shares)		933			972
Restricted stock units (in shares)		782			424
Class B Common Stock (in shares)		48,207			48,207
Diluted weighted average shares outstanding (in shares)		118,470			118,426
Diluted net income per share attributable to Liberty Oilfield Services Inc. Stockholders (in dollars per share)		$ 0.49			$ 1.53

Equity - Restricted Stock Award

Equity - Restricted Stock Awards and Restricted Stock Units (Details) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018USD ($)$ / sharesshares	Sep. 30, 2018USD ($)$ / sharesshares
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Vesting period of awards		5 years
Share-based compensation expense | $	$ 1.9	$ 3.1
Unamortized compensation expense | $	$ 15.1	$ 15.1
Weighted average remaining vesting period		2 years 6 months
Shares of Class A Common Stock | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at beginning of period (in shares)		1,258,514
Vested (in shares)		(314,462)
Forfeited (in shares)		(21,448)
Outstanding at end of period (in shares)	922,604	922,604
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Forfeited (in dollars per share) | $ / shares		$ 0
Shares of Class A Common Stock | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at beginning of period (in shares)		0
Granted (in shares)		912,876
Vested (in shares)		0
Forfeited (in shares)		(6,336)
Outstanding at end of period (in shares)	906,540	906,540
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding at beginning of period (in dollars per share) | $ / shares		$ 0
Granted (in dollars per share) | $ / shares		19.97
Vested (in dollars per share) | $ / shares		0
Forfeited (in dollars per share) | $ / shares		20.07
Outstanding at end of period (in dollars per share) | $ / shares	$ 19.97	$ 19.97

Equity - Dividends and Repurcha

Equity - Dividends and Repurchase of Common Stock (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 10, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining authorized repurchase amount	$ 46.1
Shares of Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount		$ 100
Shares of Class A Common Stock | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends, common stock, cash	$ 3.5
Common stock, dividends, per share, declared (in dollars per share)	$ 0.05
Treasury stock, shares, retired (in shares)	2,843,365
Treasury stock, retired, amount	$ 53.9
Par value reduction (in dollars per share)	$ 0.01
Liberty LLC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, dividends, per share, declared (in dollars per share)	$ 0.05
Liberty LLC | LLC Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends, common stock, cash	$ 5.9
Treasury stock, shares, retired (in shares)	2,843,365
Treasury stock, retired, amount	$ 53.9
Restricted Stock and Restricted Stock Units (RSUs) | Shares of Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends, common stock, cash	$ 0.1
Riverstone | Affiliated Entity | Shares of Class A Common Stock | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury stock, shares, retired (in shares)	2,491,160
Treasury stock acquired, average cost per share (in dollars per share)	$ 18.96

Income Taxes (Details)

Income Taxes (Details) $ in Thousands	Jan. 17, 2018agreement	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)	Jun. 30, 2018USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)	Dec. 31, 2017USD ($)
Operating Loss Carryforwards [Line Items]
Deferred tax liabilities		$ 28,600			$ 28,600
Effective combined income tax rate				14.40%
Income tax expense		12,229	$ 0	$ 36,200	36,238	$ 0
Number of tax receivable agreements | agreement	2
Deferred tax asset		2,600			2,600
Taxes payable		2,291			2,291		$ 0
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		10,900			10,900
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		$ 10,900			$ 10,900

Defined Contribution Plan (Deta

Defined Contribution Plan (Details) - 401(k) Defined Contribution Retirement Plan - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Oct. 31, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution per one dollar of employee contribution							$ 1
Maximum annual contribution per employee, percent	6.00%			3.00%
Contributions made by the employer		$ 3,600,000	$ 1,175,000		$ 10,300,000	$ 2,400,000

Related Party Transactions (Det

Related Party Transactions (Details)	Jan. 17, 2018USD ($)agreement	Sep. 30, 2018USD ($)$ / sharesshares	Mar. 31, 2018USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)	Dec. 31, 2017USD ($)
Related Party Transaction [Line Items]
Accrued liabilities—related party		$ 0			$ 0		$ 2,000,000
Revenue from related parties		6,252,000		$ 5,520,000	10,314,000	$ 20,681,000
Unbilled receivables, related parties		0			0		59,000
Prepaid expense and other current assets		33,356,000			33,356,000		21,396,000
Affiliated Entity | Equity transaction, reorganization
Related Party Transaction [Line Items]
Number of tax receivable agreements | agreement	2
Asset contribution, reorganization	$ 2,100,000
Consideration received	$ 42,600,000
Liberty Resources LLC | Affiliated Entity | Hydraulic Fracturing Services
Related Party Transaction [Line Items]
Expenses from transactions with related party		0		0	202,000	0
Due to related parties		0			0		0
Revenue from related parties		6,300,000		5,500,000	10,300,000	20,700,000
Accounts receivable, related parties		4,200,000			4,200,000		4,000,000
Unbilled receivables, related parties		0			0		100,000
Riverstone | Affiliated Entity | Service Fees
Related Party Transaction [Line Items]
Accrued liabilities—related party		0			0		2,000,000
Expenses from transactions with related party		0		300,000	0	1,300,000
Proppant Express Investments, LLC | Affiliated Entity | Administrative Support and Purchase and Lease Proppant Logistics Equipment
Related Party Transaction [Line Items]
Due to related parties		300,000			300,000		700,000
Accounts receivable, related parties		0			0		$ 0
Purchases from related party		700,000		1,900,000	2,800,000	7,700,000
Leases from related party		700,000		$ 1,100,000	3,400,000	$ 2,500,000
Discount, percentage			5.00%
Prepaid expense and other current assets		1,600,000	$ 5,400,000		1,600,000
Cost of goods sold		$ 1,600,000			$ 3,800,000
Shares of Class A Common Stock | Common Stock
Related Party Transaction [Line Items]
Treasury stock, shares, retired (in shares) | shares		2,843,365
Shares of Class A Common Stock | Common Stock | Riverstone | Affiliated Entity
Related Party Transaction [Line Items]
Treasury stock, shares, retired (in shares) | shares		2,491,160
Treasury stock acquired, average cost per share (in dollars per share) | $ / shares		$ 18.96

Commitments and Contingencies -

Commitments and Contingencies - Operating Lease Future Minimum Payments (Details) $ in Thousands	Sep. 30, 2018USD ($)
Commitments and Contingencies Disclosure [Abstract]
2,019	$ 44,481
2,020	38,515
2,021	35,888
2,022	10,521
2,023	4,444
Thereafter	20,796
Future minimum payments due	$ 154,645

Commitments and Contingencies_2

Commitments and Contingencies - Proppant, Chemical and Rail Car Commitments (Details) $ in Thousands	Sep. 30, 2018USD ($)
Commitments and Contingencies Disclosure [Abstract]
2,019	$ 294,009
2,020	244,910
2,021	102,838
2,022	8,077
2,023	0
Other commitment	$ 649,834

Commitments and Contingencies_3

Commitments and Contingencies - Additional Information (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)Tgal	Sep. 30, 2017USD ($)	Dec. 31, 2017T
Long-term Purchase Commitment [Line Items]
Rent expense | $	$ 11.7	$ 5.8	$ 29	$ 15.3
Proppant
Long-term Purchase Commitment [Line Items]
Minimum mass required (in tons) | T			11,362,000		10,108,000
Chemicals
Long-term Purchase Commitment [Line Items]
Minimum volume required | gal			23,565,000

Subsequent Events (Details)

Subsequent Events (Details) - $ / shares shares in Millions	Oct. 23, 2018	Oct. 04, 2018	Sep. 30, 2018
Subsequent Event
Subsequent Event [Line Items]
Common stock, dividends, per share, declared (in dollars per share)	$ 0.05
Distribution made to Limited Liability Company (LLC) member, distributions declared, per unit (in dollars per unit)	$ 0.05
Liberty LLC
Subsequent Event [Line Items]
Common stock, dividends, per share, declared (in dollars per share)			$ 0.05
Liberty LLC | Shares of Class B Common Stock | Subsequent Event
Subsequent Event [Line Items]
Conversion of stock, shares converted (in shares)		3
Liberty LLC | Shares of Class A Common Stock | Subsequent Event
Subsequent Event [Line Items]
Number of shares issued in transaction (in shares)		3