Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Other revenue	$ 25,633	$ 25,033	$ 51,756	$ 47,983
Other revenue, percentage of revenue	0.016	0.017	0.016	0.016
Total revenue	$ 1,645,280	$ 1,470,920	$ 3,142,514	$ 2,909,966
Percentage of revenue	1.000	1.000	1.000	1.000
Revenue Benchmark \| Product Concentration Risk \| Third-Party Payor
Disaggregation of Revenue [Line Items]
Net patient service revenue	$ 1,619,647	$ 1,445,887	$ 3,090,758	$ 2,861,983
Third party payers, percentage of revenue	98.40%	98.30%	98.40%	98.40%
Medicare \| Revenue Benchmark \| Product Concentration Risk \| Third-Party Payor
Disaggregation of Revenue [Line Items]
Net patient service revenue	$ 643,757	$ 578,163	$ 1,239,394	$ 1,147,646
Third party payers, percentage of revenue	39.10%	39.30%	39.50%	39.40%
Medicaid \| Revenue Benchmark \| Product Concentration Risk \| Third-Party Payor
Disaggregation of Revenue [Line Items]
Net patient service revenue	$ 159,733	$ 155,334	$ 309,076	$ 311,612
Third party payers, percentage of revenue	9.70%	10.60%	9.90%	10.70%
Other managed care \| Revenue Benchmark \| Product Concentration Risk \| Third-Party Payor
Disaggregation of Revenue [Line Items]
Net patient service revenue	$ 724,053	$ 634,476	$ 1,369,205	$ 1,247,593
Third party payers, percentage of revenue	44.00%	43.10%	43.60%	42.90%
Self-pay and other \| Revenue Benchmark \| Product Concentration Risk \| Third-Party Payor
Disaggregation of Revenue [Line Items]
Net patient service revenue	$ 92,104	$ 77,914	$ 173,083	$ 155,132
Third party payers, percentage of revenue	5.60%	5.30%	5.40%	5.40%