Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Other revenue	$ 25,033	$ 25,052	$ 47,983	$ 46,983
Other revenue, percentage of revenue	0.017	0.018	0.016	0.017
Revenue	$ 1,470,920	$ 1,368,734	$ 2,909,966	$ 2,685,722
Percentage of revenue	1.000	1.000	1.000	1.000
Third-Party Payor | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Net patient service revenue	$ 1,445,887	$ 1,343,682	$ 2,861,983	$ 2,638,739
Third party payers, percentage of revenue	98.30%	98.20%	98.40%	98.30%
Medicare | Third-Party Payor | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Net patient service revenue	$ 578,163	$ 533,805	$ 1,147,646	$ 1,070,157
Third party payers, percentage of revenue	39.30%	39.00%	39.40%	39.80%
Medicaid | Third-Party Payor | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Net patient service revenue	$ 155,334	$ 153,691	$ 311,612	$ 307,843
Third party payers, percentage of revenue	10.60%	11.20%	10.70%	11.50%
Other managed care | Third-Party Payor | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Net patient service revenue	$ 634,476	$ 582,169	$ 1,247,593	$ 1,126,162
Third party payers, percentage of revenue	43.10%	42.50%	42.90%	41.90%
Self-pay and other | Third-Party Payor | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Net patient service revenue	$ 77,914	$ 74,017	$ 155,132	$ 134,577
Third party payers, percentage of revenue	5.30%	5.50%	5.40%	5.10%