Accounts Receivable and Net Revenue - Schedule of Net Patient Service Revenue by Type of Payor (Detail)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Percentage of net patient service revenue	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	67.00%	66.00%	68.00%
Government [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Percentage of net patient service revenue	26.00%	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%	6.00%	5.00%
Private-Pay Patients [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Percentage of net patient service revenue	2.00%	2.00%	2.00%