Annual report pursuant to Section 13 and 15(d)


Cover - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Mar. 07, 2022
Cover [Abstract]    
Document Type 10-K  
Document Annual Report true  
Document Period End Date Dec. 31, 2021  
Current Fiscal Year End Date --12-31  
Document Transition Report false  
Entity File Number 001-40887  
Entity Registrant Name Life Time Group Holdings, Inc.  
Entity Incorporation, State or Country Code DE  
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  
Title of 12(b) Security Common stock, par value $0.01 per share  
Trading Symbol LTH  
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 false  
Entity Emerging Growth Company false  
ICFR Auditor Attestation Flag false  
Entity Shell Company false  
Entity Public Float   $ 392.9
Entity Common Stock, Shares Outstanding   193,059,949
Documents Incorporated by Reference Portions of the Proxy Statement for the Annual Meeting of Stockholders to be held on May 10, 2022, are incorporated by reference into Part III, Items 10-14 of this Annual Report on Form 10-K. The Proxy Statement will be filed with the Securities and Exchange Commission within 120 days after the end of the fiscal year to which this report relates.  
Entity Central Index Key 0001869198  
Amendment Flag false  
Document Fiscal Period Focus FY  
Document Fiscal Year Focus 2021