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Real Estate and Other Investments - Additional Information (Detail)
Jun. 30, 2019
USD ($)
investment
Dec. 31, 2018
USD ($)
Real Estate [Abstract]    
Maximum amount of investment in long-term notes payable $ 7,195,000 $ 26,635,000
Number of real estate investment held for sale | investment 2  
Real estate investments held-for-sale $ 22,842,000