Investments in Unconsolidated Joint Ventures - Narrative (Details) ft² in Millions	12 Months Ended
Dec. 31, 2015 USD ($) ft² jointventure office_properties office_buildings	Dec. 31, 2014 USD ($)
Schedule of Equity Method Investments [Line Items]
Non-cash impairment charge to write off investment in unconsolidated joint venture \| $	$ 0	$ 900,000
Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Number of joint ventures \| jointventure	3
Rentable square feet held by unconsolidated joint ventures (in square feet) \| ft²	0.8
Unconsolidated joint venture ownership interest percentage	5.00%
Unconsolidated Properties, Excluding City Square Sports Club in Phoenix, Arizona [Member]
Schedule of Equity Method Investments [Line Items]
Number of office properties \| office_properties	2
Number of office buildings held by unconsolidated joint ventures \| office_buildings	4

The number of joint venture as of the balance sheet date.

No definition available.

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- Definition

Number of Real Estate Buildings

+ References

No definition available.

+ Details

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- Definition

This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 35
-Paragraph 32
-URI http://asc.fasb.org/extlink&oid=35687916&loc=d3e32787-111569

+ Details

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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=6382943&loc=d3e33918-111571

+ Details

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- Definition

Net rentable area for properties owned.

+ References

No definition available.

+ Details

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- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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- Details

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- Details

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