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Credit Facility, Bank Loan and Lines of Credit - Additional Information (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2018
Oct. 02, 2018
USD ($)
Sep. 05, 2018
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Sep. 30, 2019
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Sep. 30, 2020
USD ($)
financial_ratio
Sep. 30, 2019
USD ($)
Sep. 30, 2020
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financial_ratio
Sep. 30, 2019
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Dec. 31, 2019
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Sep. 10, 2019
USD ($)
Aug. 14, 2019
USD ($)
Aug. 01, 2019
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Jul. 29, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 11, 2019
USD ($)
Apr. 17, 2019
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Sep. 01, 2018
USD ($)
Jun. 14, 2018
USD ($)
Debt Instrument [Line Items]                                    
Amount outstanding         $ 240,500,000   $ 240,500,000                      
Interest expense         $ 2,466,000 $ 828,000 $ 8,007,000 $ 1,350,000                    
Credit Agreement                                    
Debt Instrument [Line Items]                                    
Number of key financial ratios | financial_ratio         2   2                      
Maximum consolidated leverage ratio (not greater than)         0.0375   0.0375                      
Consolidated leverage ratio, annual decrease         0.0025   0.0025                      
Consolidated leverage ratio minimum         0.0300   0.0300                      
Minimum consolidated interest coverage ratio (not less than)             0.0325                      
Default amount of debt instrument       $ 10,000,000.0   10,000,000.0   $ 10,000,000.0                    
Average effective interest rate             3.79% 1.31%                    
Interest expense         $ 300,000 1,000,000.0 $ 100,000 $ 100,000                    
Credit Agreement | Preferred Bank                                    
Debt Instrument [Line Items]                                    
Amount outstanding         8,200,000   8,200,000                      
Credit Agreement | Minimum                                    
Debt Instrument [Line Items]                                    
Required annual facility fee       0.20%                            
Basis spread on variable rate       1.00%                            
Credit Agreement | Minimum | London Interbank Offered Rate (LIBOR)                                    
Debt Instrument [Line Items]                                    
Basis spread on variable rate       2.00%                            
Credit Agreement | Maximum                                    
Debt Instrument [Line Items]                                    
Required annual facility fee       0.35%                            
Basis spread on variable rate       2.00%                            
Credit Agreement | Maximum | London Interbank Offered Rate (LIBOR)                                    
Debt Instrument [Line Items]                                    
Basis spread on variable rate       3.00%                            
Credit Agreement | First Eight Fiscal Quarters                                    
Debt Instrument [Line Items]                                    
Principal payment on credit agreement       $ 2,400,000                            
Credit Agreement | Following Eight Fiscal Quarters Thereafter                                    
Debt Instrument [Line Items]                                    
Principal payment on credit agreement       3,600,000                            
Credit Agreement | Following Three Fiscal Quarters Thereafter                                    
Debt Instrument [Line Items]                                    
Principal payment on credit agreement       $ 4,800,000                            
NMM Line of Credit Agreement                                    
Debt Instrument [Line Items]                                    
Default amount of debt instrument         50,000,000.0   $ 50,000,000.0                      
Shareholder approval percentage (not less than)             50.01%                      
Approved use of funds (not to exceed)         125,000,000.0   $ 125,000,000.0                      
Revolver Loan                                    
Debt Instrument [Line Items]                                    
Amount outstanding         $ 60,000,000   $ 60,000,000                      
Interest rate         2.77%   2.77%                      
Revolver Loan | Credit Agreement                                    
Debt Instrument [Line Items]                                    
Revolving credit facility term       5 years                            
Amount outstanding       $ 60,000,000.0   60,000,000.0   60,000,000.0                    
Deferred financing costs       6,500,000   6,500,000   6,500,000                    
Revolver Loan | Credit Agreement | Line of Credit                                    
Debt Instrument [Line Items]                                    
Maximum loan availability       100,000,000.0   100,000,000.0   100,000,000.0                    
Letter of Credit | Credit Agreement | Preferred Bank                                    
Debt Instrument [Line Items]                                    
Amount available         $ 10,200,000   $ 10,200,000                      
Letter of Credit | Credit Agreement | Line of Credit                                    
Debt Instrument [Line Items]                                    
Maximum loan availability       25,000,000.0   25,000,000.0   25,000,000.0                    
Term Loan A                                    
Debt Instrument [Line Items]                                    
Amount outstanding         $ 180,500,000   $ 180,500,000                      
Interest rate, 2020 commitments             2.72%                      
Interest rate         2.77%   2.77%                      
Term Loan A | Credit Agreement | Line of Credit                                    
Debt Instrument [Line Items]                                    
Maximum loan availability       $ 190,000,000.0   $ 190,000,000.0   $ 190,000,000.0                    
Standby Letters of Credit                                    
Debt Instrument [Line Items]                                    
Amount outstanding                 $ 8,200,000                  
Standby Letters of Credit | APC                                    
Debt Instrument [Line Items]                                    
Maximum loan availability         $ 300,000   $ 300,000                      
Term of facility             1 year                      
Standby Letters of Credit | APAACO | Preferred Bank                                    
Debt Instrument [Line Items]                                    
Maximum loan availability   $ 6,600,000                 $ 14,800,000              
Term of facility   1 year                                
Period of notification of termination   90 days                                
Line of credit, amount terminated         6,600,000   $ 6,600,000                      
Standby Letters of Credit | Alpha Care Medical Group, Inc.                                    
Debt Instrument [Line Items]                                    
Term of facility             1 year                      
Standby Letters of Credit | Alpha Care Medical Group, Inc. | Preferred Bank                                    
Debt Instrument [Line Items]                                    
Maximum loan availability         $ 3,800,000   $ 3,800,000                      
Term of facility             1 year                      
Standby Letters of Credit | Credit Agreement | Minimum                                    
Debt Instrument [Line Items]                                    
Required annual facility fee             2.00%                      
Standby Letters of Credit | Credit Agreement | Maximum                                    
Debt Instrument [Line Items]                                    
Required annual facility fee             3.00%                      
Line of Credit | NMM Line of Credit Agreement | NMM | Preferred Bank                                    
Debt Instrument [Line Items]                                    
Maximum loan availability     $ 20,000,000.0                   $ 2,200,000     $ 16,000,000.0    
Interest rate         3.375%   3.375%   4.875%                  
Term of converted loan     5 years                              
Term of facility     5 years                              
Line of Credit | NMM Line of Credit Agreement | NMM | Prime Rate | Preferred Bank                                    
Debt Instrument [Line Items]                                    
Basis spread on variable rate             0.125%                      
Line of Credit | NMM Business Loan Agreement | NMM | Preferred Bank                                    
Debt Instrument [Line Items]                                    
Maximum loan availability                                 $ 27,000,000.0 $ 20,000,000.0
Amount outstanding                           $ 5,000,000.0        
Interest rate 5.625%                                  
Line of Credit | NMM Business Loan Agreement | NMM | Prime Rate | Preferred Bank                                    
Debt Instrument [Line Items]                                    
Basis spread on variable rate 0.125%                                  
Line of Credit | APC Business Loan Agreement | APC | Preferred Bank                                    
Debt Instrument [Line Items]                                    
Maximum loan availability                   $ 4,100,000   $ 43,800,000     $ 40,000,000.0 $ 40,000,000.0   $ 10,000,000.0
Interest rate         3.375%   3.375%   4.875%                  
Amount available         $ 0   $ 0   $ 0                  
Line of Credit | APC Business Loan Agreement | APC | Prime Rate | Preferred Bank                                    
Debt Instrument [Line Items]                                    
Basis spread on variable rate             0.125%