Real Estate Fund Investments - Summary of Ownership Interests in Alternative Investment Funds and Funds Underlying Investments (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Investment Holdings [Line Items]
Mezzanine Loans, Interest Rate	4.68%
Mezzanine loans	$ 167,614	$ 45,947
Preferred Equity Investments		94,224
Investment , total	$ 167,614	140,171
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
Mezzanine loans	$ 80,317
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
Mezzanine loans	$ 46,678	45,947
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 loans	$ 40,619
PGRESS Funds
Investment Holdings [Line Items]
Preferred Equity Investments		94,224
PGRESS Funds \| 470 Vanderbilt Avenue [Member]
Investment Holdings [Line Items]
Preferred Equity Investments		35,039
PGRESS Funds \| 2 Herald Square [Member]
Investment Holdings [Line Items]
Preferred Equity Investments		18,107
PGRESS Funds \| One Court Square [Member]
Investment Holdings [Line Items]
Preferred Equity Investments		$ 41,078

Mezzanine loan ownership percentage.

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Preferred equity investments of the fund.

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Fair value of investments in certain entities that calculate net asset value per share, including, but not limited to, by unit, membership interest, or other ownership interest. Investments include, but are not limited to, investments in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 6A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=SL6742756-110258

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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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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(a))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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