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Credit Facility, Bank Loan and Lines of Credit - Additional Information (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Dec. 31, 2018
Oct. 02, 2018
USD ($)
Sep. 05, 2018
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Sep. 30, 2019
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Jun. 30, 2020
USD ($)
financial_ratio
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
financial_ratio
Jun. 30, 2019
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Dec. 31, 2019
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Sep. 10, 2019
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Aug. 14, 2019
USD ($)
Aug. 01, 2019
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Jul. 29, 2019
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Jun. 11, 2019
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Apr. 17, 2019
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Sep. 01, 2018
USD ($)
Jun. 14, 2018
USD ($)
Debt Instrument [Line Items]                                  
Amount outstanding         $ 245,250,000   $ 245,250,000                    
Interest expense         2,673,000 $ 311,000 5,541,000 $ 522,000                  
Loan proceeds         $ 230,455,000   $ 230,455,000                    
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                          
Average effective interest rate             3.93% 4.71%                  
Interest expense         $ 300,000 700,000 $ 0 $ 0                  
Credit Agreement | Preferred Bank                                  
Debt Instrument [Line Items]                                  
Amount outstanding         14,800,000   $ 14,800,000                    
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 at end of period         3.24%   3.24%                    
Revolver Loan | Credit Agreement                                  
Debt Instrument [Line Items]                                  
Revolving credit facility term       5 years                          
Amount outstanding       $ 60,000,000.0                          
Deferred financing costs       6,500,000                          
Revolver Loan | Credit Agreement | Line of Credit                                  
Debt Instrument [Line Items]                                  
Maximum loan availability       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                          
Term loan A                                  
Debt Instrument [Line Items]                                  
Amount outstanding         $ 185,250,000   $ 185,250,000                    
interest rate at end of period         3.57%   3.57%                    
Term loan A | Credit Agreement | Line of Credit                                  
Debt Instrument [Line Items]                                  
Maximum loan availability       $ 190,000,000.0                          
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                              
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 at end of period         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   $ 5,000,000.0                  
interest rate at end of period 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     $ 10,000,000.0
interest rate at end of period         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%