Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Other revenue	$ 33,376	$ 24,879	$ 81,359	$ 71,862
Other revenue, percentage of revenue	0.023	0.018	0.019	0.018
Revenue	$ 1,449,817	$ 1,377,727	$ 4,359,783	$ 4,063,449
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	$ 1,416,441	$ 1,352,848	$ 4,278,424	$ 3,991,587
Third party payers, percentage of revenue	97.70%	98.20%	98.10%	98.20%
Medicare | Third-Party Payor | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Net patient service revenue	$ 561,491	$ 537,884	$ 1,709,137	$ 1,608,041
Third party payers, percentage of revenue	38.70%	39.00%	39.30%	39.60%
Medicaid | Third-Party Payor | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Net patient service revenue	$ 148,448	$ 151,401	$ 460,060	$ 459,244
Third party payers, percentage of revenue	10.20%	11.00%	10.60%	11.30%
Other managed care | Third-Party Payor | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Net patient service revenue	$ 627,112	$ 587,802	$ 1,874,705	$ 1,713,964
Third party payers, percentage of revenue	43.30%	42.70%	43.00%	42.20%
Self-pay and other | Third-Party Payor | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Net patient service revenue	$ 79,390	$ 75,761	$ 234,522	$ 210,338
Third party payers, percentage of revenue	5.50%	5.50%	5.20%	5.10%