Summary of Significant Accounting Policies - Summary of Estimated Useful Lives (Details)	12 Months Ended
	Dec. 31, 2017
Building | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	25 years
Building | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	40 years
Building Improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years
Building Improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	25 years
Integral Equipment, Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years