Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Other revenue	$ 26,485	$ 25,633	$ 44,279	$ 51,756
Other revenue, percentage of revenue	0.016	0.016	0.014	0.016
Total revenue	$ 1,622,245	$ 1,645,280	$ 3,224,115	$ 3,142,514
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	$ 1,595,760	$ 1,619,647	$ 3,179,836	$ 3,090,758
Third party payers, percentage of revenue	98.40%	98.40%	98.60%	98.40%
Medicare \| Revenue Benchmark \| Product Concentration Risk \| Third-Party Payor
Disaggregation of Revenue [Line Items]
Net patient service revenue	$ 651,544	$ 643,757	$ 1,320,712	$ 1,239,394
Third party payers, percentage of revenue	40.20%	39.10%	41.00%	39.50%
Medicaid \| Revenue Benchmark \| Product Concentration Risk \| Third-Party Payor
Disaggregation of Revenue [Line Items]
Net patient service revenue	$ 159,640	$ 159,733	$ 318,501	$ 309,076
Third party payers, percentage of revenue	9.80%	9.70%	9.90%	9.90%
Other managed care \| Revenue Benchmark \| Product Concentration Risk \| Third-Party Payor
Disaggregation of Revenue [Line Items]
Net patient service revenue	$ 688,448	$ 724,053	$ 1,373,012	$ 1,369,205
Third party payers, percentage of revenue	42.40%	44.00%	42.60%	43.60%
Self-pay and other \| Revenue Benchmark \| Product Concentration Risk \| Third-Party Payor
Disaggregation of Revenue [Line Items]
Net patient service revenue	$ 96,128	$ 92,104	$ 167,611	$ 173,083
Third party payers, percentage of revenue	6.00%	5.60%	5.10%	5.40%