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Cover page - USD ($) $ in Millions	12 Months Ended
Cover page - USD ($) $ in Millions	Dec. 31, 2020	Feb. 24, 2021	Jun. 30, 2020
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Document Transition Report	false
Entity File Number	001-38183
Entity Registrant Name	RANGER ENERGY SERVICES, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	81-5449572
Entity Address, Address Line One	10350 Richmond
Entity Address, Address Line Two	Suite 550
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77042
City Area Code	713
Local Phone Number	895-8900
Title of 12(b) Security	Class A Common Stock, $0.01 par value
Trading Symbol	RNGR
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Shell Company	false
Entity Public Float			$ 14.4
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant’s definitive proxy statement for the 2021 Annual Meeting of Stockholders, to be filed no later than 120 days after the end of the fiscal year to which this Annual Report on Form 10-K relates, are incorporated by reference into Part III of this Annual Report on Form 10-K.
Entity Central Index Key	0001699039
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
ICFR Auditor Attestation Flag	true
Class A Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		8,541,915
Class B Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		6,866,154