Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Other revenue	$ 35,549	$ 33,376	$ 87,305	$ 81,359
Other revenue, percentage of revenue	0.023	0.023	0.018	0.019
Total revenue	$ 1,576,746	$ 1,449,817	$ 4,719,260	$ 4,359,783
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	$ 1,541,197	$ 1,416,441	$ 4,631,955	$ 4,278,424
Third party payers, percentage of revenue	97.70%	97.70%	98.20%	98.10%
Medicare | Revenue Benchmark | Product Concentration Risk | Third-Party Payor
Disaggregation of Revenue [Line Items]
Net patient service revenue	$ 599,491	$ 561,491	$ 1,838,885	$ 1,709,137
Third party payers, percentage of revenue	38.00%	38.70%	38.90%	39.30%
Medicaid | Revenue Benchmark | Product Concentration Risk | Third-Party Payor
Disaggregation of Revenue [Line Items]
Net patient service revenue	$ 154,120	$ 148,448	$ 463,196	$ 460,060
Third party payers, percentage of revenue	9.80%	10.20%	9.90%	10.60%
Other managed care | Revenue Benchmark | Product Concentration Risk | Third-Party Payor
Disaggregation of Revenue [Line Items]
Net patient service revenue	$ 701,279	$ 627,112	$ 2,070,484	$ 1,874,705
Third party payers, percentage of revenue	44.50%	43.30%	43.90%	43.00%
Self-pay and other | Revenue Benchmark | Product Concentration Risk | Third-Party Payor
Disaggregation of Revenue [Line Items]
Net patient service revenue	$ 86,307	$ 79,390	$ 259,390	$ 234,522
Third party payers, percentage of revenue	5.40%	5.50%	5.50%	5.20%