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Summary of Significant Accounting Policies - Property and Investment in Unconsolidated Joint Ventures (Details) | 12 Months Ended
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Dec. 31, 2017
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

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