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Summary of Investments in Real Estate (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Real Estate Properties [Line Items]    
Land $ 211,959 $ 209,111
Building 1,409,776 1,384,810
Furniture, fixtures and equipment 83,034 66,502
Total investment in real estate 1,704,769 1,660,423
Accumulated depreciation (136,488) (112,270)
Investments in real estate, net $ 1,568,281 $ 1,548,153
Building    
Real Estate Properties [Line Items]    
Depreciable Lives 40 years  
Furniture, fixtures and equipment | Minimum    
Real Estate Properties [Line Items]    
Depreciable Lives 5 years  
Furniture, fixtures and equipment | Maximum    
Real Estate Properties [Line Items]    
Depreciable Lives 10 years