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Investments in Real Estate - Additional Information (Detail)
$ in Thousands
1 Months Ended 3 Months Ended
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Property
Dec. 31, 2018
USD ($)
Real Estate Properties [Line Items]      
Investments in real estate, net, Book Value   $ 106,996 $ 107,824
Investments in real estate   116,738 116,592
Mortgages loans or other debt held by third parties   40,534 40,724
Mortgages loans held by consolidated securitizations   80,562 80,562
Investments in real estate, held for sale   7,448 4,918
Retail real estate properties      
Real Estate Properties [Line Items]      
Investments in real estate   $ 49,108 49,088
Number of real estate properties disposed | Property   1  
Commercial mortgage loans | Subsequent Event      
Real Estate Properties [Line Items]      
Investments in real estate, net, Book Value $ 7,448    
Carrying Value, Transfer of commercial real estate loan to real estate owned $ 7,448    
Land      
Real Estate Properties [Line Items]      
Investments in real estate, net, Book Value   $ 36,905 36,905
Building and Building Improvements      
Real Estate Properties [Line Items]      
Investments in real estate, net, Book Value   $ 79,833 $ 79,687