Related-Party Transactions - Additional Information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Apr. 30, 2020	Dec. 31, 2019 USD ($)	Nov. 28, 2018 USD ($) agreement	Jun. 28, 2018 USD ($)	Nov. 16, 2015 USD ($)
Related Party Transaction [Line Items]
Operating lease right-of-use assets	$ 20,219,000		$ 20,219,000			$ 14,248,000
Lease liabilities	20,768,000		20,768,000
Recognized risk pool revenue	5,815,000	$ 15,985,000	17,607,000	$ 26,835,000
NMM | Board Members
Related Party Transaction [Line Items]
Consulting services paid	0	27,000	100,000	100,000
NMM | LMA
Related Party Transaction [Line Items]
Revenue from related parties	4,200,000	8,400,000	5,200,000
APC | PMIOC | Service
Related Party Transaction [Line Items]
Payments to related parties	400,000	1,000,000.0	600,000	1,400,000
APC | DMG | Service
Related Party Transaction [Line Items]
Payments to related parties	900,000	2,600,000	1,800,000	3,800,000
Universal Care, Inc.
Related Party Transaction [Line Items]
Amount of subordinated note receivable agreement									$ 5,000,000.0
Universal Care Acquisition Partners, LLC
Related Party Transaction [Line Items]
Amount of subordinated note receivable agreement							$ 5,000,000.0	$ 2,500,000
Number of additional subordinated note receivable agreements | agreement							2
APC Shareholders | APC | Service
Related Party Transaction [Line Items]
Payments to related parties	9,000,000.0	7,100,000	16,300,000	16,400,000
Advance Diagnostic Surgery Center | APC | Service
Related Party Transaction [Line Items]
Payments to related parties	100,000	100,000
APC Shareholders and Officers | APC
Related Party Transaction [Line Items]
Payments to related parties	3,000,000.0	1,900,000	4,800,000	5,100,000
Medical Property Partners | NMM
Related Party Transaction [Line Items]
Payments to related parties	300,000	500,000	300,000	500,000
One MSO, Inc.
Related Party Transaction [Line Items]
Operating lease right-of-use assets	10,600,000		10,600,000
Lease liabilities	10,600,000		10,600,000
One MSO, Inc. | NMM
Related Party Transaction [Line Items]
Payments to related parties	400,000		700,000
Critical Quality Management Corp
Related Party Transaction [Line Items]
Payments to related parties	100,000	200,000
Numen LLC
Related Party Transaction [Line Items]
Operating lease right-of-use assets	1,400,000		1,400,000
Lease liabilities	1,400,000		1,400,000
Numen LLC | SCHC
Related Party Transaction [Line Items]
Payments to related parties	100,000	200,000	100,000	200,000
AHMC
Related Party Transaction [Line Items]
Recognized risk pool revenue	10,200,000	$ 21,000,000.0	10,200,000	$ 25,000,000.0
Amount outstanding under agreement	$ 53,700,000		$ 53,700,000			$ 40,400,000
Universal Care, Inc.
Related Party Transaction [Line Items]
Ownership interest									48.90%
LMA | NMM
Related Party Transaction [Line Items]
Ownership interest	25.00%	25.00%	25.00%	25.00%
PMIOC | APC Shareholders | APC | Service
Related Party Transaction [Line Items]
Ownership interest	40.00%	40.00%	40.00%	40.00%
DMG | APC Shareholders | APC | Service
Related Party Transaction [Line Items]
Ownership interest	40.00%	40.00%	40.00%	40.00%
One MSO, Inc. | Dr. Sim And Dr. Lam
Related Party Transaction [Line Items]
Ownership interest	50.00%		50.00%
APC | Universal Care, Inc. | Universal Care Acquisition Partners, LLC
Related Party Transaction [Line Items]
Ownership interest					48.90%