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Credit Facility, Bank Loan and Lines of Credit - Additional Information (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 11, 2019
USD ($)
Oct. 03, 2018
USD ($)
Sep. 05, 2018
USD ($)
Mar. 03, 2017
USD ($)
May 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Sep. 10, 2019
USD ($)
Aug. 14, 2019
USD ($)
Aug. 01, 2019
USD ($)
Jul. 29, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 11, 2019
USD ($)
Apr. 17, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 01, 2018
USD ($)
Jun. 14, 2018
USD ($)
Dec. 31, 2010
USD ($)
Debt Instrument [Line Items]                                    
Amount outstanding           $ 250,000,000 $ 250,000,000                      
Credit Agreement                                    
Debt Instrument [Line Items]                                    
Maximum consolidated leverage ratio           0.0375 0.0375                      
Consolidated leverage ratio, annual change           0.0025 0.0025                      
Consolidated leverage ratio           0.0300 0.0300                      
Minimum consolidated interest coverage ratio             0.0325                      
Default amount of debt instrument $ 10,000,000                                  
Interest rate during period           1.02% 0.56%                      
NMM Line of Credit Agreement                                    
Debt Instrument [Line Items]                                    
Default amount of debt instrument           $ 50,000,000 $ 50,000,000                      
Approved use of funds           125,000,000 $ 125,000,000                      
Shareholder approval percentage             50.01%                      
ICC | Bank Loan                                    
Debt Instrument [Line Items]                                    
Face amount of debt                                   $ 4,600,000.0
Interest rate on debt                             5.50%      
Revolver loan                                    
Debt Instrument [Line Items]                                    
Amount outstanding           60,000,000 $ 60,000,000                      
Revolver loan | Credit Agreement                                    
Debt Instrument [Line Items]                                    
Revolving credit facility term 5 years                                  
Maximum loan availability           60,000,000 60,000,000                      
Deferred financing costs $ 6,400,000                                  
Revolver loan | NMM | NMM Business Loan Agreement                                    
Debt Instrument [Line Items]                                    
Letters of credit outstanding           10,200,000 10,200,000                      
Letter of Credit | NMM | NMM Business Loan Agreement                                    
Debt Instrument [Line Items]                                    
Letters of credit outstanding           14,800,000 14,800,000                      
Term loan A                                    
Debt Instrument [Line Items]                                    
Amount outstanding           190,000,000 190,000,000                      
Standby Letters of Credit | APC                                    
Debt Instrument [Line Items]                                    
Maximum loan availability           305,016 $ 305,016                      
Term of facility             1 year                      
Standby Letters of Credit | APC and APC-LSMA                                    
Debt Instrument [Line Items]                                    
Maximum loan availability           $ 3,800,000.0 $ 3,800,000.0                      
Preferred Bank | Line of Credit | NMM | NMM Line of Credit Agreement                                    
Debt Instrument [Line Items]                                    
Maximum loan availability     $ 20,000,000               $ 2,200,000     $ 16,000,000        
interest rate at end of period           5.125% 5.125%               5.625%      
Term of converted loan     5 years                              
Term of facility     5 years                              
Preferred Bank | Line of Credit | NMM | NMM Business Loan Agreement                                    
Debt Instrument [Line Items]                                    
Maximum loan availability                               $ 27,000,000 $ 20,000,000  
interest rate at end of period           5.125% 5.125%               5.625%      
Amount outstanding                       $ 5,000,000            
Preferred Bank | Line of Credit | APC | APC Business Loan Agreement                                    
Debt Instrument [Line Items]                                    
Maximum loan availability               $ 4,105,016   $ 43,800,000     $ 40,000,000       $ 10,000,000  
interest rate at end of period           5.125% 5.125%               5.625%      
Amount drawn during period         $ 39,600,000                          
Amount outstanding           $ 0 $ 0               $ 0      
Amount available           $ 0 $ 0               $ 9,700,000      
Preferred Bank | Standby Letters of Credit | APAACO                                    
Debt Instrument [Line Items]                                    
Maximum loan availability   $ 6,601,612.57   $ 6,699,328.68         $ 14,843,767.57                  
Term of facility   1 year   1 year                            
Period of notification of termination   90 days   90 days                            
Prime Rate | Preferred Bank | Line of Credit | NMM | NMM Line of Credit Agreement                                    
Debt Instrument [Line Items]                                    
Basis spread on variable rate             0.125%                      
Prime Rate | Preferred Bank | Line of Credit | NMM | NMM Business Loan Agreement                                    
Debt Instrument [Line Items]                                    
Basis spread on variable rate             0.125%                      
Prime Rate | Preferred Bank | Line of Credit | APC | APC Business Loan Agreement                                    
Debt Instrument [Line Items]                                    
Basis spread on variable rate             0.125%                      
AP-AMH Medical Corporation | Affiliated Entity                                    
Debt Instrument [Line Items]                                    
Amount of loan 545,000,000                                  
Minimum | Credit Agreement                                    
Debt Instrument [Line Items]                                    
Required annual facility fee             0.20%                      
Minimum | NMM | Credit Agreement                                    
Debt Instrument [Line Items]                                    
Basis spread on variable rate             1.00%                      
Minimum | Standby Letters of Credit | NMM | Credit Agreement                                    
Debt Instrument [Line Items]                                    
Required annual facility fee             2.00%                      
Minimum | London Interbank Offered Rate (LIBOR) | NMM | Credit Agreement                                    
Debt Instrument [Line Items]                                    
Basis spread on variable rate             2.00%                      
Maximum | Credit Agreement                                    
Debt Instrument [Line Items]                                    
Required annual facility fee             0.35%                      
Maximum | NMM | Credit Agreement                                    
Debt Instrument [Line Items]                                    
Basis spread on variable rate             2.00%                      
Maximum | Standby Letters of Credit | NMM | Credit Agreement                                    
Debt Instrument [Line Items]                                    
Required annual facility fee             3.00%                      
Maximum | London Interbank Offered Rate (LIBOR) | NMM | Credit Agreement                                    
Debt Instrument [Line Items]                                    
Basis spread on variable rate             3.00%                      
Line of Credit | Revolver loan | Credit Agreement                                    
Debt Instrument [Line Items]                                    
Maximum loan availability 100,000,000                                  
Line of Credit | Letter of Credit | Credit Agreement                                    
Debt Instrument [Line Items]                                    
Maximum loan availability 25,000,000                                  
Line of Credit | Term loan A | Credit Agreement                                    
Debt Instrument [Line Items]                                    
Maximum loan availability 190,000,000                                  
Payment Period One | Credit Agreement                                    
Debt Instrument [Line Items]                                    
Principal payment on Credit Agreement 2,400,000                                  
Payment Period Two | Credit Agreement                                    
Debt Instrument [Line Items]                                    
Principal payment on Credit Agreement 3,600,000                                  
Payment Period Three | Credit Agreement                                    
Debt Instrument [Line Items]                                    
Principal payment on Credit Agreement $ 4,800,000                                  
Alpha Care Medical Group, Inc. | Standby Letters of Credit | APC and APC-LSMA                                    
Debt Instrument [Line Items]                                    
Term of facility             1 year