Summary of Significant Accounting Policies - Property and Investment in Unconsolidated Joint Ventures (Details)	12 Months Ended
	Dec. 31, 2019
Investment in unconsolidated joint ventures
Threshold ownership percentage above which to use equity method of accounting only if no controlling financial interest	50.00%
Buildings and improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets (in years)	5 years
Buildings and improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets (in years)	40 years
Tenant improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets (in years)	5 years
Tenant improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets (in years)	7 years
Equipment and furnishings | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets (in years)	5 years
Equipment and furnishings | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets (in years)	7 years