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Significant Accounting Policies - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 10, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Jan. 01, 2019
Accounting Policies [Abstract]              
Unpaid obligations record as restricted assets   $ 2,000 $ 0 $ 2,000 $ 0 $ 5,000  
Minimum protective endowment held in an interest-bearing account   $ 500,000 $ 500,000 $ 500,000 $ 500,000    
Authorized shares of common stock   32,000,000   32,000,000   32,000,000  
Common stock, par value (in dollars per share)   $ 0.01   $ 0.01   $ 0.01  
Issued shares of common stock   21,948,563   21,948,563   21,743,498  
Outstanding shares of common stock   21,948,563   21,948,563   21,743,498  
Authorized shares of preferred stock   8,000,000   8,000,000   8,000,000  
Issued shares of preferred stock   0   0   0  
Outstanding shares of preferred stock   0   0   0  
Dividends paid per share (in dollars per share) $ 0.50            
Amount of antidilutive securities excluded from computation of earnings per share (in shares)   0 0 29,000 0    
Accumulated other comprehensive income net of tax   $ 449,000   $ 449,000   $ 32,000  
Tax from unrealized gains and losses on marketable securities       156,000   10,000  
Reclassifications from AOCI   0   0      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Lease liability   113,832,000   113,832,000      
Right-of-use asset   97,484,000   97,484,000      
Other Assets              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Tuition receivable, noncurrent   $ 1,200,000   $ 1,200,000   $ 1,100,000  
Accounting Standards Update 2016-02              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Lease liability             $ 123,000,000
Right-of-use asset             $ 107,000,000