Revenue - Schedule of Revenue and Percentage Generated by Each Payor Type (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Revenue	$ 651,719	$ 582,156	$ 1,268,372	$ 1,133,355
U.S. Facilities [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Revenue	$ 651,719	$ 582,156	$ 1,268,372	$ 1,133,355
Revenue, Percentage	100.00%	100.00%	100.00%	100.00%
U.S. Facilities [Member] | Commercial [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Revenue	$ 201,674	$ 178,846	$ 396,367	$ 341,548
Revenue, Percentage	30.90%	30.70%	31.20%	30.10%
U.S. Facilities [Member] | Medicare [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Revenue	$ 96,791	$ 90,494	$ 191,373	$ 176,679
Revenue, Percentage	14.80%	15.50%	15.10%	15.60%
U.S. Facilities [Member] | Medicaid [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Revenue	$ 326,277	$ 282,416	$ 626,191	$ 557,036
Revenue, Percentage	50.10%	48.50%	49.40%	49.10%
U.S. Facilities [Member] | Self-Pay [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Revenue	$ 18,701	$ 23,434	$ 38,486	$ 45,877
Revenue, Percentage	2.90%	4.00%	3.00%	4.00%
U.S. Facilities [Member] | Other [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Revenue	$ 8,276	$ 6,966	$ 15,955	$ 12,215
Revenue, Percentage	1.30%	1.30%	1.30%	1.20%