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Summary of Significant Accounting Policies - Estimated Useful Lives (Details)
3 Months Ended
Mar. 31, 2019
Building | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful life (in years) 30 years
Building | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful life (in years) 50 years
Land improvements | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful life (in years) 9 years
Land improvements | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful life (in years) 15 years
Furniture and fixtures | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful life (in years) 5 years
Furniture and fixtures | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful life (in years) 14 years