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Related Party Transactions - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 28, 2018	Dec. 31, 2017	Nov. 16, 2015	Sep. 30, 2015
LMA [Member]
Equity Method Investment, Ownership Percentage	25.00%		25.00%
Revenue from Related Parties	$ 6,100,000	$ 4,500,000	$ 16,000,000	$ 13,400,000
Service [Member] \| PMIOC [Member]
Equity Method Investment, Ownership Percentage	40.00%		40.00%
Payment Made To Related Party	$ 700,000	600,000	$ 1,900,000	1,700,000
Service [Member] \| AMG, Inc [Member]
Payment Made To Related Party	$ 800,000	600,000	$ 2,600,000	1,900,000
Service [Member] \| DMG [Member]
Equity Method Investment, Ownership Percentage	40.00%		40.00%
Payment Made To Related Party	$ 1,700,000	1,700,000	$ 5,500,000	4,700,000
Rob Mikitarian [Member]
Business Combination, Contingent Consideration, Liability	145,000		145,000			$ 145,000
Rob Mikitarian [Member] \| Notes Receivable [Member]
Debt Instrument, Face Amount								$ 150,000
Debt Instrument, Interest Rate, Effective Percentage								3.00%
Accounts and Other Receivables, Net, Current	150,000		150,000			$ 150,000
Universal Care Inc [Member]
Accounts and Other Receivables, Net, Current							$ 5,000,000
Equity Method Investment, Ownership Percentage							48.90%
Advance Diagnostic Surgery Center [Member] \| Service [Member]
Payment Made To Related Party	76,000	77,000	244,000	174,000
Medical Property Partners [Member]
Payment Made To Related Party	300,000	300,000	800,000	800,000
Medical Investment Group LLC [Member]
Payment Made To Related Party	60,000	90,000	240,000	270,000
APC Shareholders [Member] \| Service [Member]
Payment Made To Related Party	7,300,000	9,200,000	29,200,000	32,200,000
Shareholders And Officers [Member]
Payment Made To Related Party	$ 2,400,000	$ 2,800,000	$ 9,800,000	$ 12,200,000
Universal Care Acquisition Partners, LLC [Member]
Accounts and Other Receivables, Net, Current					$ 2,500,000