Subsequent Events - Additional Information (Details)	Jul. 17, 2017 USD ($)	Jul. 16, 2017 Fund	Jun. 30, 2017 ft²	Jun. 20, 2017 ft²
Subsequent Event [Line Items]
Area of office and retail properties | ft²			11,800,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Percentage of ownership interest in new joint venture	36.60%
Fund VII and Fund VII H [Member]
Subsequent Event [Line Items]
Percentage interest in fund			7.20%
50 Beale Street [Member]
Subsequent Event [Line Items]
Property funds, ownership percentage			3.10%
50 Beale Street [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Number of unconsolidated real estate funds | Fund		2
Property funds, ownership percentage	31.10%
Percentage of interest directly acquired in property	13.20%
Percentage of remaining interest acquired in property by new joint venture	49.00%
Value of property acquired | $	$ 517,500,000
Value of debt assumed with acquisition | $	$ 228,000,000
Debt, fixed interest rate	3.65%
Maturity date of debt	2021-10
50 Beale Street [Member] | Fund VII and Fund VII H [Member]
Subsequent Event [Line Items]
Property ownership, percentage			42.80%
Area of office and retail properties | ft²				661,000
50 Beale Street [Member] | Fund VII and Fund VII H [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Percentage interest sold	62.20%
50 Beale Street [Member] | Third Party Investors [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Property funds, remaining ownership percentage		57.20%