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Investments in Real Estate - Additional Information (Detail)
$ in Thousands
1 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Property
Dec. 31, 2018
USD ($)
Real Estate Properties [Line Items]      
Investments in real estate, net, Book Value $ 113,605 $ 113,605 $ 107,824
Investments in real estate 124,327 124,327 116,592
Mortgages loans or other debt held by third parties 40,351 40,351 40,724
Mortgages loans held by consolidated securitizations 96,168 96,168 80,562
Retail real estate properties      
Real Estate Properties [Line Items]      
Investments in real estate 56,556 $ 56,556 49,088
Number of real estate properties disposed | Property   2  
Commercial Mortgage Loans      
Real Estate Properties [Line Items]      
Investments in real estate, net, Book Value 7,448 $ 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 41,119 41,119 36,905
Building and Building Improvements      
Real Estate Properties [Line Items]      
Investments in real estate, net, Book Value $ 83,208 $ 83,208 $ 79,687