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Related Party Transactions - Related Party Revenue (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) ft² property	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) ft² property	Sep. 30, 2014 USD ($)
Related Party Transaction [Line Items]
Area of real estate property (in sqft) | ft²	10,100,000		10,100,000
Sponsors | Supervisory Fee Revenue
Related Party Transaction [Line Items]
Revenue from related parties	$ 500	$ 500	$ 1,400	$ 1,600
Sponsors | Property Management Fee Revenue
Related Party Transaction [Line Items]
Revenue from related parties	100	100	200	300
Sponsors | Leased space rental
Related Party Transaction [Line Items]
Revenue from related parties	$ 60	$ 200	$ 20	$ 100
Area of real estate property (in sqft) | ft²	3,074		3,074
Number of properties (in properties) | property	1		1
Undivided Interest
Related Party Transaction [Line Items]
Area of real estate property (in sqft) | ft²	647		647

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- Definition

Area of a real estate property.

+ References

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- Definition

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

+ References

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- Definition

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+ References

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 225



-SubTopic 10



-Section S99



-Paragraph 2



-Subparagraph (SX 210.5-03.1(e))



-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Related Parties



-URI http://asc.fasb.org/extlink&oid=16382449



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 946



-SubTopic 225



-Section S99



-Paragraph 1



-Subparagraph (SX 210.6-07.1(c))



-URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999

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