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Related Party Transactions - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Nov. 16, 2015
Sep. 30, 2015
LMA [Member]        
Equity Method Investment, Ownership Percentage 25.00%      
Revenue from Related Parties $ 17,600,000 $ 17,200,000    
PMIOC [Member]        
Equity Method Investment, Ownership Percentage 40.00%      
DMG [Member]        
Payment Made To Related Party $ 6,100,000 5,300,000    
Service [Member] | PMIOC [Member]        
Payment Made To Related Party 2,300,000 1,800,000    
Service [Member] | AMG, Inc [Member]        
Payment Made To Related Party 2,100,000 2,200,000    
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      
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 250,000 265,000    
Medical Property Partners [Member] | Service [Member]        
Payment Made To Related Party 1,000,000 1,000,000    
Medical Investment Group LLC [Member]        
Payment Made To Related Party 400,000 200,000    
APC Shareholders [Member]        
Payment Made To Related Party 41,500,000 40,700,000    
Shareholders And Officers [Member]        
Payment Made To Related Party $ 14,100,000 $ 14,000,000