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Related Party Transactions - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Nov. 28, 2018
Jun. 28, 2018
Nov. 16, 2015
LMA [Member]          
Equity Method Investment, Ownership Percentage 25.00%        
Revenue from Related Parties $ 3,200,000 $ 4,600,000      
Service [Member] | PMIOC [Member]          
Payment Made To Related Party 700,000 400,000      
Service [Member] | AMG, Inc [Member]          
Payment Made To Related Party 1,300,000 700,000      
Service [Member] | DMG [Member]          
Payment Made To Related Party 2,000,000 1,600,000      
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 92,000 22,000      
Medical Property Partners [Member]          
Payment Made To Related Party 300,000 300,000      
Medical Investment Group LLC [Member]          
Payment Made To Related Party   90,000      
APC Shareholders [Member] | Service [Member]          
Payment Made To Related Party $ 9,300,000 9,200,000      
APC Shareholders [Member] | Service [Member] | PMIOC [Member]          
Equity Method Investment, Ownership Percentage 40.00%        
APC Shareholders [Member] | Service [Member] | DMG [Member]          
Equity Method Investment, Ownership Percentage 40.00%        
Shareholders And Officers [Member]          
Payment Made To Related Party $ 3,300,000 2,300,000      
Universal Care Acquisition Partners, LLC [Member]          
Accounts and Other Receivables, Net, Current     $ 5,000,000 $ 2,500,000  
Critical Quality Management Corp [Member]          
Payment Made To Related Party 100,000 35,000      
Numen LLC [Member]          
Payment Made To Related Party 100,000 100,000      
AHMC [Member]          
Revenue from Related Parties 10,100,000 18,000,000      
Deferred Revenue, Revenue Recognized $ 49,800,000 $ 44,200,000