Variable Interest Entities (VIEs) - Schedule of Assets and Liabilities, Variable Interest Entities (Details) - USD ($) $ in Thousands		Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents		$ 339,703	$ 288,455	$ 325,310
Investment in marketable securities		2,417	2,378
Receivables, net (including amounts with related parties)		348,730	275,990
Income taxes receivable		7,893	19,316
Other receivables		8,655	29,496
Prepaid expenses and other current assets		21,754	22,861
Total current assets		729,152	638,496
Non-current assets
Intangible assets, net		105,737	118,179
Goodwill		416,917	419,253
Income taxes receivable, non-current		15,943	15,943
Investments in other entities – equity method		38,454	39,319
Operating lease right-of-use assets		30,631	32,601
Other assets		30,450	16,667
Total non-current assets		713,198	716,398
Total assets	[1]	1,442,350	1,354,894
Current liabilities
Accounts payable and accrued expenses		119,661	106,142
Fiduciary accounts payable		4,734	8,223
Medical liabilities		287,691	209,039	$ 151,482	$ 287,691	$ 106,657
Operating lease liabilities		5,319	5,350
Other liabilities		29,841	27,479
Total current liabilities		459,746	365,608
Non-current liabilities
Deferred tax liability		2,593	4,555
Operating lease liabilities, net of current portion		28,714	30,654
Other long-term liabilities		12,294	14,610
Total non-current liabilities		444,658	475,118
Total liabilities	[1]	904,404	840,726
Variable Interest Entity, Primary Beneficiary
Current assets
Cash and cash equivalents		157,097	158,922
Investment in marketable securities		2,306	2,259
Other receivables		1,717	15,303
Prepaid expenses and other current assets		7,041	10,161
Amount due from affiliates		35,141	0
Total current assets		338,783	318,873
Non-current assets
Property and equipment, net		5,848	5,875
Intangible assets, net		78,952	87,840
Goodwill		241,831	243,283
Income taxes receivable, non-current		15,943	15,943
Investments in other entities – equity method		15,114	15,442
Investment in a privately held entity		405	405
Investment in affiliates		152,584	224,894
Operating lease right-of-use assets		26,197	21,585
Other assets		3,052	3,059
Total non-current assets		539,926	618,326
Total assets		878,709	937,199
Current liabilities
Accounts payable and accrued expenses		34,374	43,800
Fiduciary accounts payable		4,734	8,223
Medical liabilities		116,878	105,486
Income tax payable		19,411	11,041
Operating lease liabilities		4,382	3,487
Other liabilities		12,290	2,509
Amount due to affiliates		0	48,142
Total current liabilities		192,069	222,688
Non-current liabilities
Deferred tax liability		9,642	11,237
Operating lease liabilities, net of current portion		25,004	21,012
Other long-term liabilities		3,538	1,139
Total non-current liabilities		38,184	33,388
Total liabilities		230,253	256,076
Variable Interest Entity, Primary Beneficiary | Related Party
Current assets
Receivables, net (including amounts with related parties)		$ 135,481	$ 132,228

[1] The Company’s condensed consolidated balance sheets include the assets and liabilities of its consolidated VIEs. The condensed consolidated balance sheets include total assets that can be used only to settle obligations of the Company’s consolidated VIEs totaling $691.0 million and $712.3 million as of June 30, 2025 and December 31, 2024, respectively, and total liabilities of the Company’s consolidated VIEs for which creditors do not have recourse to the general credit of the primary beneficiary of $230.3 million and $207.9 million as of June 30, 2025 and December 31, 2024, respectively. These VIE balances do not include $152.6 million of investment in affiliates and $35.1 million of amounts due from affiliates as of June 30, 2025, and $224.9 million of investment in affiliates and $48.1 million of amounts due to affiliates as of December 31, 2024, as these are eliminated upon consolidation and not presented within the condensed consolidated balance sheets. See Note 15 — “Variable Interest Entities (VIEs)” for further details.   The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.