Real Estate Fund Investments - Summary of Property Funds Ownership Interests in These Funds and Funds Ownership Interest in Underlying Properties (Parenthetical) (Details) - One Market Plaza [Member]	12 Months Ended
	Dec. 31, 2015
Investment Holdings [Line Items]
Ownership interest rate of property	49.00%
Other Investors [Member]
Investment Holdings [Line Items]
Ownership interest rate of property	49.00%