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Variable Interest Entities - Additional Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2022
USD ($)
Clinic
Dec. 31, 2021
USD ($)
Variable Interest Entity    
Number of business units relying on operating activities of nominee-owned legal entities | Clinic 1  
Assets $ 16,928,252 $ 17,121,488
Liabilities 14,703,452 $ 14,750,508
Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity    
Assets 316,639  
Liabilities $ 191,357