Summary of Significant Accounting Policies - Summary of Estimated Useful Lives (Details)	6 Months Ended
	Jun. 30, 2018
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	25 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	40 years
Building Improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	10 years
Building Improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	25 years
Integral Equipment, Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years