Variable Interest Entities (VIEs) (Details) - USD ($) $ in Thousands		Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents		$ 325,310		$ 293,807	$ 293,921
Investment in marketable securities		2,383		2,498
Income taxes receivable		22,005		10,657
Other receivables		1,642		1,335
Prepaid expenses and other current assets		17,417		17,450
Total current assets		570,349		461,507
Non-current assets
Intangible assets, net		116,231		71,648
Goodwill		409,581		278,831
Income taxes receivable, non-current		15,943		15,943
Investments in other entities – equity method		33,276	$ 35,893	25,774	45,831	$ 43,108	$ 40,299
Operating lease right-of-use assets		28,792		37,396
Other assets		9,289		1,877
Total non-current assets		682,122		471,854
Total assets	[1]	1,252,471		933,361
Current liabilities
Accounts payable and accrued expenses		95,757		59,949
Fiduciary accounts payable		7,321		7,737
Medical liabilities		151,482		106,657	$ 100,047		$ 81,255
Dividend payable		638		638
Finance lease liabilities		591		646
Operating lease liabilities		4,884		4,607
Current portion of long-term debt		17,000		19,500
Other liabilities		32,152		18,940
Total current liabilities		309,825		218,674
Non-current liabilities
Finance lease liabilities, net of current portion		879		1,033
Operating lease liabilities, net of current portion		27,092		36,289
Deferred tax liability		3,250		4,072
Other long-term liabilities		7,723		3,586
Total non-current liabilities		463,950		303,919
Total liabilities	[1]	773,775		522,593
Nonrelated Party
Current assets
Receivables, net		132,323		76,780
Related Party
Current assets
Receivables, net		69,269		58,980
Variable Interest Entity, Primary Beneficiary
Current assets
Cash and cash equivalents		173,974		184,078
Income taxes receivable		0		1,600
Other receivables		1,025		454
Prepaid expenses and other current assets		11,563		9,991
Total current assets		305,046		275,950
Non-current assets
Land, property and equipment, net		5,117		5,306
Intangible assets, net		84,286		60,906
Goodwill		231,088		140,157
Income taxes receivable, non-current		15,943		15,943
Investments in other entities – equity method		12,676		12,114
Investment in affiliates		516,433		273,182
Investment in a privately held entity		405		405
Restricted cash		40		40
Operating lease right-of-use assets		16,097		28,796
Other assets		1,196		1,149
Total non-current assets		883,281		537,998
Total assets		1,188,327		813,948
Current liabilities
Accounts payable and accrued expenses		39,881		32,707
Fiduciary accounts payable		7,321		7,737
Medical liabilities		70,363		55,157
Dividend payable		638		638
Income tax payable		19,176		0
Finance lease liabilities		556		646
Operating lease liabilities		2,846		3,305
Amount due to affiliates		72,830		107,340
Other liabilities		10,365		8,542
Total current liabilities		223,976		216,072
Non-current liabilities
Finance lease liabilities, net of current portion		777		1,033
Operating lease liabilities, net of current portion		15,994		28,675
Deferred tax liability		6,822		7,284
Other long-term liabilities		1,056		230
Total non-current liabilities		24,649		37,222
Total liabilities		248,625		253,294
Variable Interest Entity, Primary Beneficiary | Nonrelated Party
Current assets
Receivables, net		49,506		21,120
Variable Interest Entity, Primary Beneficiary | Related Party
Current assets
Receivables, net		$ 68,978		$ 58,707

[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 $671.9 million and $540.8 million as of June 30, 2024 and December 31, 2023, 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 $175.8 million and $146.0 million as of June 30, 2024 and December 31, 2023, respectively. These VIE balances do not include $516.4 million of investment in affiliates and $72.8 million of amounts due to affiliates as of June 30, 2024, and $273.2 million of investment in affiliates and $107.3 million of amounts due to affiliates as of December 31, 2023, as these are eliminated upon consolidation and not presented within the condensed consolidated balance sheets. See Note 16 — “Variable Interest Entities (VIEs)” for further details.