Investment in Unconsolidated Joint Ventures (AMCO 120 WT Holdings, LLC) (Details) - AMCO 120 WT Holdings, LLC ft² in Thousands, $ in Thousands	Dec. 31, 2017 USD ($) ft² apartment_unit
Schedule of Equity Method Investments [Line Items]
Ownership interest percentage	20.00%
Number of apartment units \| apartment_unit	330
Cash balance of joint venture \| $	$ 1
Office Space
Schedule of Equity Method Investments [Line Items]
Square footage of real estate property (square feet)	30
Retail Space
Schedule of Equity Method Investments [Line Items]
Square footage of real estate property (square feet)	10
AMLI Residential
Schedule of Equity Method Investments [Line Items]
Ownership interest percentage	80.00%

Equity method investments summarized financial information cash.

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- Definition

Area of a real estate property.

+ References

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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The number of units in a real estate property owned as of the balance sheet date.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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