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Accounts Receivable and Net Revenue - Schedule of Net Patient Service Revenue by Type of Payor (Detail)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Health Care Organization, Receivable and Revenue Disclosures [Line Items]    
Percentage of net patient service revenue 100.00% 100.00%
Contracted Managed Care [Member]    
Health Care Organization, Receivable and Revenue Disclosures [Line Items]    
Percentage of net patient service revenue 67.00% 69.00%
Government [Member]    
Health Care Organization, Receivable and Revenue Disclosures [Line Items]    
Percentage of net patient service revenue 26.00% 25.00%
Other Third-Parties [Member]    
Health Care Organization, Receivable and Revenue Disclosures [Line Items]    
Percentage of net patient service revenue 5.00% 5.00%
Private-Pay Patients [Member]    
Health Care Organization, Receivable and Revenue Disclosures [Line Items]    
Percentage of net patient service revenue 2.00% 1.00%