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Accounts Receivable and Net Revenue - Schedule of Net Patient Service Revenue by Type of Payor (Detail)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Percentage of net patient service revenue 100.00% 100.00% 100.00% 100.00%
Contracted Managed Care [Member]        
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Percentage of net patient service revenue 70.00% 70.00% 70.00% 70.00%
Government [Member]        
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Percentage of net patient service revenue 24.00% 25.00% 24.00% 25.00%
Other Third-Parties [Member]        
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Percentage of net patient service revenue 4.00% 4.00% 5.00% 4.00%
Private-Pay Patients [Member]        
Health Care Organization, Receivable and Revenue Disclosures [Line Items]        
Percentage of net patient service revenue 2.00% 1.00% 1.00% 1.00%