Annual report pursuant to Section 13 and 15(d)


Cover - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Feb. 26, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
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 Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 722.0
Entity Common Stock, Shares Outstanding   196,705,443  
Documents Incorporated by Reference Portions of the Proxy Statement for the Annual Meeting of Stockholders to be held on April 26, 2024, 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 2023