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Real Estate and Other Investments - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
investment
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]    
Maximum amount of investment in long-term notes payable $ 4,304 $ 26,635
Number of real estate investment held for sale | investment 1  
Real estate investments held-for-sale $ 3,364  
Maximum | Investments in Joint Ventures    
Debt Instrument [Line Items]    
Percent of fair value (less than 3%) 20.00%  
Maximum | Investments in Joint Ventures | Assets Held    
Debt Instrument [Line Items]    
Percent of fair value (less than 3%) 10.00%  
Maximum | Investments in Joint Ventures | Total Assets    
Debt Instrument [Line Items]    
Percent of fair value (less than 3%) 3.00%