Investments in Other Entities - Additional Information (Details)						1 Months Ended			12 Months Ended
	Oct. 30, 2020 USD ($)	Apr. 30, 2020 USD ($)	Aug. 30, 2019 USD ($)	Jul. 01, 2019 USD ($)	Jun. 29, 2018 USD ($)	Jun. 30, 2018 USD ($)	May 31, 2018 USD ($) $ / shares shares	Aug. 31, 2015 USD ($) shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2020	Dec. 31, 2020 primary_care_physician	Dec. 31, 2020 specialty_care_physician	Dec. 31, 2020 plan	Dec. 31, 2020 medical_center	Dec. 31, 2020 provider	Dec. 31, 2020 member	Dec. 18, 2020 USD ($)	Dec. 16, 2020	Aug. 31, 2019 USD ($)	Jun. 28, 2019 USD ($)	Apr. 23, 2019 USD ($)	Dec. 18, 2018 USD ($)	Sep. 21, 2018 USD ($)	Jul. 31, 2015 USD ($)	Dec. 31, 2012 USD ($)
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments									$ 3,694,000	$ (6,901,000)	$ (8,125,000)
Investments in other entities – equity method									43,292,000	28,427,000
Payments to acquire equity method investments									9,969,000	3,108,000	16,706,000
Proceeds from sale of equity method investment									52,743,000	0	0
Investments in privately held entities									37,075,000	896,000
Proceeds from equity method investment									0	240,000	607,000
Contribution									950,000
Gain on sale of equity method investment									99,839,000	0	$ 0
Accountable Health Care IPA
Schedule of Equity Method Investments [Line Items]
Consideration transferred			$ 25,100,000
Accountable Health Care IPA | Dr. Jay
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments			$ 1,800,000
Interest acquired			75.00%
Consideration transferred			$ 7,300,000
APC LSMA | Accountable Health Care IPA
Schedule of Equity Method Investments [Line Items]
Interest acquired			75.00%
APC LSMA | Accountable Health Care IPA | Dr. Jay
Schedule of Equity Method Investments [Line Items]
Consideration transferred			$ 7,300,000
APC and APC-LSMA | Accountable Health Care IPA | Dr. Jay
Schedule of Equity Method Investments [Line Items]
Interest acquired			75.00%
Consideration transferred			$ 7,300,000
APC | Notes Receivable | Dr. Arteaga
Schedule of Equity Method Investments [Line Items]
Amount of loan																						$ 6,400,000
APC | Accountable Health Care IPA
Schedule of Equity Method Investments [Line Items]
Interest acquired			25.00%
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 (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
NMM | Notes Receivable | Pacific6
Schedule of Equity Method Investments [Line Items]
Amount of loan	$ 500,000
Gain on sale of equity method investment	$ 200,000
NMM | 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					500,000
Accountable Health Care IPA
Schedule of Equity Method Investments [Line Items]
Number of medical centers | medical_center																1
Number of employees (more than)													336	559
Number of members of federally qualified health plans (more than) | member																		73,000
Number federally qualified health plans | plan															3
Pacific6
Schedule of Equity Method Investments [Line Items]
Ownership interest																								33.30%
HSMSO
Schedule of Equity Method Investments [Line Items]
Ownership interest																								33.30%
LaSalle Medical Associates – IPA Line of Business
Schedule of Equity Method Investments [Line Items]
Number of medical centers | medical_center																6
Number of employees (more than) | provider																	2,300
Income (loss) from equity method investments									276,000
Investments in other entities – equity method									13,047,000	6,396,000
Contribution									0
LaSalle Medical Associates – IPA Line of Business | APC LSMA
Schedule of Equity Method Investments [Line Items]
Amount invested for interest																											$ 5,000,000.0
Ownership interest																											25.00%
LaSalle Medical Associates – IPA Line of Business | APC and APC-LSMA | Notes Receivable | Dr. Arteaga
Schedule of Equity Method Investments [Line Items]
Ownership upon conversion of finance receivable																			46.25%
LaSalle Medical Associates – IPA Line of Business | APC
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments									300,000	(2,800,000)
Investments in other entities – equity method									6,400,000
LaSalle Medical Associates – IPA Line of Business | APC | Notes Receivable | Dr. Arteaga
Schedule of Equity Method Investments [Line Items]
Amount of loan																			$ 6,400,000
Increase in ownership percentage, finance receivable converted												21.25%							21.25%
Pacific Medical Imaging & Oncology Center, Inc.
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments									17,000
Investments in other entities – equity method									1,413,000	1,396,000
Contribution									0
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									17,470	(36,384)
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									2,200,000	2,700,000
Universal Care, Inc.
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments									3,560,000
Investments in other entities – equity method		$ 4,998,000							0	1,438,000
Proceeds from sale of equity method investment		52,743,000
Beneficial interest in UCI		15,723,000
Contribution									0
Gain on sale of equity method investment		99,647,000
Universal Care, Inc. | Bright | Preferred stock
Schedule of Equity Method Investments [Line Items]
Investments in privately held entities		$ 36,179,000
Universal Care, Inc. | APC
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments									3,600,000	(1,200,000)
Investments in other entities – equity method										1,400,000
Ownership interest disposed		48.90%
Proceeds from sale of equity method investment		$ 69,200,000
Repayment of indebtedness received		16,500,000
Beneficial interest in UCI		15,700,000
Universal Care, Inc. | APC | Bright | Preferred stock
Schedule of Equity Method Investments [Line Items]
Investments in privately held entities		36,200,000							36,200,000
Universal Care, Inc. | UCAP
Schedule of Equity Method Investments [Line Items]
Contingent consideration, cash held in escrow		15,600,000
Contingent consideration, preferred shares		6,400,000
Contingent consideration, fair value		$ 22,000,000.0
Universal Care, Inc. | UCAP | A-2 Voting Common Stock
Schedule of Equity Method Investments [Line Items]
Shares purchased (in shares) | shares								100,000
Payments to acquire equity method investments								$ 10,000,000.0
Percentage of voting common stock								50.00%
Universal Care, Inc. | UCAP | A-2 Voting Common Stock | Ancillary Service Contract
Schedule of Equity Method Investments [Line Items]
Ownership interest								48.90%
Universal Care, Inc. | UCAP | Bright
Schedule of Equity Method Investments [Line Items]
Ownership interest disposed		48.90%
Proceeds from sale of equity method investment		$ 69,200,000
Universal Care, Inc. | UCAP | APC
Schedule of Equity Method Investments [Line Items]
Repayment of indebtedness received		$ 16,500,000
Diagnostic Medical Group
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments									279,000
Investments in other entities – equity method									2,613,000	2,334,000
Contribution									0
Diagnostic Medical Group | APC
Schedule of Equity Method Investments [Line Items]
Ownership interest												40.00%
Income (loss) from equity method investments									300,000	300,000
Investments in other entities – equity method									2,600,000	2,300,000
Proceeds from equity method investment									0	200,000
Accountable Health Care IPA
Schedule of Equity Method Investments [Line Items]
Ownership interest			25.00%
Accountable Health Care IPA | NMM and APC | Convertible Debt
Schedule of Equity Method Investments [Line Items]
Loan balance converted																									$ 5,000,000.0
Accountable Health Care IPA | APC
Schedule of Equity Method Investments [Line Items]
Ownership interest																									25.00%
Accountable Health Care IPA | APC | Convertible Debt
Schedule of Equity Method Investments [Line Items]
Loan balance converted																									$ 5,000,000.0
Accountable Health Care IPA | NMM
Schedule of Equity Method Investments [Line Items]
Investments in other entities – equity method																									$ 5,000,000.0
531 W. College, LLC – related party
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments									(448,000)
Investments in other entities – equity method									17,200,000	16,698,000
Payments to acquire real estate					$ 33,300,000
Contribution									950,000
531 W. College, LLC – related party | NMM and APC
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments									(400,000)	(200,000)
531 W. College, LLC – related party | APC
Schedule of Equity Method Investments [Line Items]
Ownership interest						25.00%						50.00%											50.00%
Investments in other entities – equity method									17,200,000	16,700,000													$ 16,100,000
Initial capital contributions						$ 8,300,000
Payments to escrow deposit						$ 8,300,000
Contribution									1,000,000.0	700,000
531 W. College, LLC – related party | NMM
Schedule of Equity Method Investments [Line Items]
Amount invested for interest																							$ 8,300,000
Ownership interest						25.00%																	25.00%
Initial capital contributions						$ 8,300,000
Payments to escrow deposit						$ 8,300,000
531 W. College, LLC – related party | 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 – related party | AHMC Healthcare Inc
Schedule of Equity Method Investments [Line Items]
Payments to escrow deposit						$ 16,700,000
MWN, LLC – related party
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments									10,000
Investments in other entities – equity method									0	165,000
Contribution									0
MWN, LLC – related party | NMM
Schedule of Equity Method Investments [Line Items]
Ownership interest												33.30%												33.30%
Initial capital contributions																								$ 3,000
Working capital contribution																					$ 300,000			30,000
MWN, LLC – related party | Pacific6
Schedule of Equity Method Investments [Line Items]
Initial capital contributions																								3,000
Working capital contribution																								30,000
MWN, LLC – related party | HSMSO
Schedule of Equity Method Investments [Line Items]
Initial capital contributions																								3,000
Working capital contribution																								$ 30,000
One MSO, LLC - related party
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments									0
Investments in other entities – equity method									2,395,000	0
Contribution									0
One MSO, LLC - related party | APC
Schedule of Equity Method Investments [Line Items]
Ownership interest												50.00%
Tag-6 Medical Investment Group, LLC - related party
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments									0
Investments in other entities – equity method									4,516,000	0
Contribution									0
Tag-6 Medical Investment Group, LLC - related party | APC
Schedule of Equity Method Investments [Line Items]
Ownership interest												50.00%
Tag-8 Medical Investment Group, LLC - related party
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments									0
Investments in other entities – equity method									2,108,000	$ 0
Contribution									$ 0
Tag-8 Medical Investment Group, LLC - related party | APC
Schedule of Equity Method Investments [Line Items]
Ownership interest																				50.00%