Real Estate Fund Investments - Summary of Ownership Interest in Fund VIII and Underlying Investments in Fund VIII (Details)	3 Months Ended
Mar. 31, 2016
Investment Holdings [Line Items]
Mezzanine Loans, Interest Rate	4.68%
Mortgage Loan \| 700 Eighth Avenue [Member]
Investment Holdings [Line Items]
Mezzanine Loans, Ownership	1.70%
Mezzanine Loans, Interest Rate	6.40%
Mezzanine Loans, Initial Maturity	Dec. 31, 2016
Property Fund VIII \| 26 Broadway [Member]
Investment Holdings [Line Items]
Mezzanine Loans, Ownership	1.70%
Mezzanine Loans, Interest Rate	8.30%
Mezzanine Loans, Initial Maturity	Jan. 31, 2022
Property Fund VIII \| 1440 Broadway [Member]
Investment Holdings [Line Items]
Mezzanine Loans, Ownership	1.70%
Mezzanine Loans, Interest Rate	6.40%
Mezzanine Loans, Initial Maturity	Oct. 31, 2019

Mezzanine loan ownership percentage.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

+ 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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