Investments in Other Entities — Equity Method - Additional Information (Details)		1 Months Ended			3 Months Ended
	Jul. 01, 2019 USD ($)	Apr. 30, 2020 USD ($)	Jun. 30, 2018 USD ($)	May 31, 2018 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) provider	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 18, 2020 USD ($)	Apr. 23, 2019 USD ($)	May 31, 2016	Jul. 31, 2015 USD ($)	Dec. 31, 2012 USD ($)
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments					$ (677,000)	$ 2,054,000
Investments in other entities – equity method					42,615,000		$ 43,292,000
Preferred shares in Bright Health					37,075,000		37,075,000
APC | MediPortal LLC
Schedule of Equity Method Investments [Line Items]
Membership interests purchased (in shares) | shares				270,000
Payments to purchase membership interests				$ 400,000
Membership interests acquired (in dollars per share) | $ / shares				$ 1.50
Ownership percentage				2.80%
Term of warrant				5 years
Number of warrants received (in shares) | shares				270,000
Term of option				5 years
Options to purchase additional membership interests (in shares) | shares				380,000
Number of warrants available to purchase, contingent upon the portal completion date (in shares) | shares				480,000
Network Medical Management, Inc. | AchievaMed, Inc.
Schedule of Equity Method Investments [Line Items]
Ownership percentage	10.00%
Percentage of voting common stock, within five years	50.00%
Duration of investment	5 years
Investment amount	$ 500,000
Related investment balance					$ 500,000
LaSalle Medical Associates
Schedule of Equity Method Investments [Line Items]
Number of employees (more than) | provider					2,400
Income (loss) from equity method investments					$ (718,000)
Investments in other entities – equity method					12,329,000		13,047,000
LaSalle Medical Associates | APC LSMA
Schedule of Equity Method Investments [Line Items]
Amount invested for interest												$ 5,000,000.0
Ownership interest												25.00%
LaSalle Medical Associates | APC
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments					(700,000)	(600,000)
LaSalle Medical Associates | APC | Convertible Secured Promissory Note | Dr. Arteaga
Schedule of Equity Method Investments [Line Items]
Amount of loan								$ 6,400,000
Equity method investment, conversion of finance receivable, ownership percentage increase								21.25%
LaSalle Medical Associates | APC and APC-LSMA | Convertible Secured Promissory Note | Dr. Arteaga
Schedule of Equity Method Investments [Line Items]
Ownership upon conversion of finance receivable								46.25%
Pacific Medical Imaging & Oncology Center, Inc.
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments					(14,000)
Investments in other entities – equity method					1,399,000		1,413,000
Pacific Medical Imaging & Oncology Center, Inc. | APC LSMA
Schedule of Equity Method Investments [Line Items]
Amount invested for interest											$ 1,200,000
Ownership interest											40.00%
Pacific Medical Imaging & Oncology Center, Inc. | APC
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments					(14,570)	100,000
Investments in other entities – equity method					1,400,000		1,400,000
Pacific Medical Imaging & Oncology Center, Inc. | APC | Ancillary Service Contract
Schedule of Equity Method Investments [Line Items]
Fees paid					500,000	600,000
Diagnostic Medical Group
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments					36,000
Investments in other entities – equity method					2,649,000		2,613,000
Diagnostic Medical Group | APC
Schedule of Equity Method Investments [Line Items]
Ownership interest										40.00%
Income (loss) from equity method investments					36,000	5,244
531 W. College LLC
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments					(106,000)
Investments in other entities – equity method					$ 17,094,000		17,200,000
Purchase price of real estate			$ 33,300,000
531 W. College LLC | APC
Schedule of Equity Method Investments [Line Items]
Ownership interest			25.00%		50.00%
Income (loss) from equity method investments					$ (100,000)	(100,000)
Initial capital contributions			$ 8,300,000
531 W. College LLC | College Street Investment LP
Schedule of Equity Method Investments [Line Items]
Ownership interest			50.00%
Initial capital contributions			$ 16,700,000
531 W. College LLC | Network Medical Management, Inc.
Schedule of Equity Method Investments [Line Items]
Amount invested for interest					16,100,000				$ 8,300,000
Ownership interest			25.00%						25.00%
Initial capital contributions			$ 8,300,000
One MSO, LLC - related party
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments					125,000	$ 125,000
Investments in other entities – equity method					2,520,000		$ 2,395,000
One MSO, LLC - related party | APC
Schedule of Equity Method Investments [Line Items]
Ownership interest							50.00%
Tag-6 Medical Investment Group, LLC
Schedule of Equity Method Investments [Line Items]
Investments in other entities – equity method					4,500,000		$ 4,500,000
Tag-8 Medical Investment Group, LLC
Schedule of Equity Method Investments [Line Items]
Investments in other entities – equity method					2,100,000		$ 2,100,000
Tag-8 Medical Investment Group, LLC | APC
Schedule of Equity Method Investments [Line Items]
Ownership interest							50.00%
Universal Care, Inc. | APC | Preferred Stock | Bright
Schedule of Equity Method Investments [Line Items]
Preferred shares in Bright Health					$ 36,200,000
Universal Care, Inc. | Universal Care Acquisition Partners, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest disposed		48.90%
Universal Care, Inc. | Universal Care Acquisition Partners, LLC | APC
Schedule of Equity Method Investments [Line Items]
Repayment of indebtedness		$ 16,500,000
Universal Care, Inc. | Universal Care Acquisition Partners, LLC | Bright
Schedule of Equity Method Investments [Line Items]
Cash proceeds		69,200,000
Proceeds from sale of equity method investments		$ 69,200,000