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Related Party Transactions - Related Party Revenue (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) ft²	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Sponsors [Member] | Family Office Services [Member]
Related Party Transaction [Line Items]
Revenue from related parties	$ 200,000	$ 100,000	$ 1,100,000
Number of square feet of shared office space company is reimbursed for | ft²	647
Number of square feet of leased space for which company receives market rental rate | ft²	3,074
Third party management and other fees [Member] | Sponsors [Member] | Supervisory Fee Revenue [Member]
Related Party Transaction [Line Items]
Revenue from related parties	$ 1,800,000	2,000,000	2,800,000
Third party management and other fees [Member] | Sponsors [Member] | Property Management Fee Revenue [Member]
Related Party Transaction [Line Items]
Revenue from related parties	300,000	400,000	1,600,000
Third party management and other fees [Member] | Equity Method Investee [Member] | Supervisory Fee Revenue [Member]
Related Party Transaction [Line Items]
Revenue from related parties	0	0	600,000
Third party management and other fees [Member] | Equity Method Investee [Member] | Property Management Fee Revenue [Member]
Related Party Transaction [Line Items]
Revenue from related parties	0	0	100,000
Other income and fees [Member] | Sponsors [Member] | Profit Share [Member]
Related Party Transaction [Line Items]
Revenue from related parties	0	0	3,300,000
Other income and fees [Member] | Sponsors [Member] | Other Fees and Disbursements from Non-Controlled Affiliates [Member]
Related Party Transaction [Line Items]
Revenue from related parties	0	0	20,000
Other income and fees [Member] | Equity Method Investee [Member] | Profit Share [Member]
Related Party Transaction [Line Items]
Revenue from related parties	0	0	400,000
Other income and fees [Member] | Equity Method Investee [Member] | Other Fees and Disbursements from Non-Controlled Affiliates [Member]
Related Party Transaction [Line Items]
Revenue from related parties	0	0	1,100,000
Other income and fees [Member] | Equity Method Investee [Member] | Other Fees Reimbursed on the Equity Method for Offering Costs Related to Offering [Member]
Related Party Transaction [Line Items]
Revenue from related parties	$ 0	$ 0	$ 1,100,000

X

- Definition

Number Of Square Feet Of Leased Space For Which Company Receives Market Rental Rate

+ References

No definition available.

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- Definition

Number of square feet of shared office space company is reimbursed for

+ References

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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

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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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