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Description of Business - Additional Information (Detail) - USD ($)
1 Months Ended 9 Months Ended 12 Months Ended
Jul. 01, 1999
Nov. 15, 2016
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2011
Sep. 01, 2018
Dec. 31, 2017
Jul. 31, 2016
Jun. 04, 2014
Description Of Business [Line Items]                  
Proceeds from Issuance of Common Stock     $ 200,000 $ 0          
Initial Fixed Term Of Amended and Restated Management and Administrative Services Agreement 30 years                
Apollo Palliative Services LLC [Member]                  
Description Of Business [Line Items]                  
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners           100.00%      
ApolloMed [Member]                  
Description Of Business [Line Items]                  
Equity Method Investment, Ownership Percentage     4.85%       4.95%    
Concourse Diagnostic Surgery Center, LLC [Member]                  
Description Of Business [Line Items]                  
Equity Method Investment, Ownership Percentage         41.59%     43.43%  
Payments to Acquire Equity Method Investments         $ 625,000        
Universal Care Acquisition Partners, LLC [Member]                  
Description Of Business [Line Items]                  
Equity Method Investment, Ownership Percentage                 100.00%
Pacific Ambulatory Surgery Center [Member]                  
Description Of Business [Line Items]                  
Equity Method Investment, Ownership Percentage     40.00%            
International Cancer Center ICC" [Member]                  
Description Of Business [Line Items]                  
Proceeds from Issuance of Common Stock   $ 400,000              
Equity Method Investment, Ownership Percentage   40.00%