| Cover | May 11, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | May 11, 2022 |
| Entity Registrant Name | Life Time Group Holdings, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-40887 |
| Entity Tax Identification Number | 47-3481985 |
| Entity Address, Address Line One | 2902 Corporate Place |
| Entity Address, City or Town | Chanhassen |
| Entity Address, State or Province | MN |
| Entity Address, Postal Zip Code | 55317 |
| City Area Code | 952 |
| Local Phone Number | 947-0000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock, par value $0.01 per share |
| Trading Symbol | LTH |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001869198 |
| Amendment Flag | false |
