| Cover | Apr. 09, 2021 | Feb. 25, 2021 |
| Cover [Abstract] | ||
| Document Type | 8-K | |
| Document Period End Date | Apr. 9, 2021 | |
| Entity Registrant Name | Ranger Energy Services, Inc. | |
| Entity Incorporation, State or Country Code | DE | |
| Entity File Number | 001-38183 | |
| 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 | 935-8900 | |
| Written Communications | false | |
| Soliciting Material | false | |
| Pre-commencement Tender Offer | false | |
| Pre-commencement Issuer Tender Offer | false | |
| Title of 12(b) Security | Class A Common Stock, $0.01 par value | |
| Trading Symbol | RNGR | |
| Security Exchange Name | NYSE | |
| Entity Emerging Growth Company | true | |
| Entity Ex Transition Period | true | |
| Amendment Flag | false | |
| Entity Central Index Key | 0001699039 |
