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Shareholders' Equity - Additional Information (Detail)
 3 Months Ended 9 Months Ended
Aug. 27, 2020
USD ($)
Memberofboardofdirector
$ / shares
shares
Sep. 30, 2020
USD ($)
Stockholder
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
Stockholder
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
Equity [Line Items]            
Shares repurchased | shares   396        
Dividend & distribution payable, per share | $ / shares   $ 0.25 $ 0.25 $ 0.25 $ 0.25  
Accrued distributions | $   $ 600,000   $ 600,000   $ 300,000
Maximum            
Equity [Line Items]            
Accrued preferred distributions | $   $ 100,000   $ 100,000    
Series A Preferred Interest            
Equity [Line Items]            
Preferred shares issued | shares 4,000          
Shares issued, price per share | $ / shares $ 1,000          
Preferred shares issued | $ $ 4,000,000          
Preferred shareholders entitled to appoint number of additional members to board of directors | Memberofboardofdirector 2          
Class A Common Shares            
Equity [Line Items]            
Shares repurchased | shares     0 5,120 27,028  
Number of shareholders | Stockholder   190   190    
Class B Common Shares            
Equity [Line Items]            
Shares repurchased | shares   0 0 0 0  
Number of shareholders | Stockholder   4   4    
Additional Paid-in Capital            
Equity [Line Items]            
Offset treasury shares due to redomestication | $   $ 4,126,000 $ 0 $ 4,126,000 $ 0