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Revenue Recognition and Accounts Receivable - Additional Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Accounts receivable $ 1,957,583 $ 1,824,282
Medicare bad debt claims    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Accounts receivable 1,174,123 $ 1,101,837
Accounts Receivable    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Accounts receivable $ 0  
Percentage Of Accounts Receivable Six Months Or More Past Due 16.00% 17.00%
Accounts Receivable Period Outstanding 6 months  
Accounts Receivable, Noncurrent, Threshold Period Past Due 1 year  
Customer Concentration Risk | Accounts Receivable | Third-Party Payor    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Number of concentration risk customers 0 0
Concentration risk percentage 10.00% 10.00%