Revenue - Schedule of Revenue and Percentage Generated by Each Payor Type (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Revenue	$ 704,267	$ 616,653
U.S. Facilities [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Revenue	$ 704,267	$ 616,653
Revenue, Percentage	100.00%	100.00%
U.S. Facilities [Member] | Commercial [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Revenue	$ 203,619	$ 195,169
Revenue, Percentage	28.90%	31.60%
U.S. Facilities [Member] | Medicare [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Revenue	$ 108,640	$ 94,920
Revenue, Percentage	15.40%	15.40%
U.S. Facilities [Member] | Medicaid [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Revenue	$ 364,306	$ 300,526
Revenue, Percentage	51.80%	48.70%
U.S. Facilities [Member] | Self-Pay [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Revenue	$ 20,698	$ 19,747
Revenue, Percentage	2.90%	3.20%
U.S. Facilities [Member] | Other [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Revenue	$ 7,004	$ 6,291
Revenue, Percentage	1.00%	1.10%