Real Estate Fund Investments - Schedule of Financial Information for Fund Investment (Parenthetical) (Details) - Unconsolidated Real Estate Funds [Member] - Property Fund VII [Member] - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Investment Holdings [Line Items]
Real estate investments	$ 158,822	$ 165,556
50 Beale Street [Member]
Investment Holdings [Line Items]
Real estate investments	$ 122,677	$ 123,105