Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Disaggregation of Revenue [Line Items]
Other revenue	$ 28,005	$ 35,549	$ 72,284	$ 87,305
Other revenue, percentage of revenue	0.017	0.023	0.015	0.018
Total revenue	$ 1,624,856	$ 1,576,746	$ 4,848,971	$ 4,719,260
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	$ 1,596,851	$ 1,541,197	$ 4,776,687	$ 4,631,955
Third party payers, percentage of revenue	98.30%	97.70%	98.50%	98.20%
Medicare | Revenue Benchmark | Product Concentration Risk | Third-Party Payor
Disaggregation of Revenue [Line Items]
Net patient service revenue	$ 641,667	$ 599,491	$ 1,962,379	$ 1,838,885
Third party payers, percentage of revenue	39.50%	38.00%	40.50%	38.90%
Medicaid | Revenue Benchmark | Product Concentration Risk | Third-Party Payor
Disaggregation of Revenue [Line Items]
Net patient service revenue	$ 152,185	$ 154,120	$ 470,686	$ 463,196
Third party payers, percentage of revenue	9.40%	9.80%	9.70%	9.90%
Other managed care | Revenue Benchmark | Product Concentration Risk | Third-Party Payor
Disaggregation of Revenue [Line Items]
Net patient service revenue	$ 715,870	$ 701,279	$ 2,088,882	$ 2,070,484
Third party payers, percentage of revenue	44.10%	44.50%	43.10%	43.90%
Self-pay and other | Revenue Benchmark | Product Concentration Risk | Third-Party Payor
Disaggregation of Revenue [Line Items]
Net patient service revenue	$ 87,129	$ 86,307	$ 254,740	$ 259,390
Third party payers, percentage of revenue	5.30%	5.40%	5.20%	5.50%