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Summary of Investments in Real Estate (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Real Estate Properties [Line Items]    
Land $ 178,566 $ 165,120
Building 1,139,176 1,066,611
Furniture, fixtures and equipment 22,831 17,625
Total investment in real estate 1,340,573 1,249,356
Accumulated depreciation (66,853) (51,511)
Investments in real estate, net $ 1,273,720 $ 1,197,845
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