| Cover | Jul. 27, 2021 | Feb. 05, 2020 |
| Cover [Abstract] | ||
| Document Type | 8-K | |
| Document Period End Date | Oct. 26, 2021 | |
| Entity Registrant Name | LIBERTY OILFIELD SERVICES INC. | |
| Entity Incorporation, State or Country Code | DE | |
| Entity File Number | 001-38081 | |
| Entity Tax Identification Number | 81-4891595 | |
| Entity Address, Address Line One | 950 17th Street | |
| Entity Address, Address Line Two | Suite 2400 | |
| Entity Address, City or Town | Denver | |
| Entity Address, State or Province | CO | |
| Entity Address, Postal Zip Code | 80202 | |
| City Area Code | 303 | |
| Local Phone Number | 515-2800 | |
| 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, par value $0.01 | |
| Trading Symbol | LBRT | |
| Security Exchange Name | NYSE | |
| Entity Emerging Growth Company | false | |
| Amendment Flag | false | |
| Entity Central Index Key | 0001694028 |
