Investments in Unconsolidated Real Estate Funds - Schedule of Financial Information for Fund Investment (Details) - Unconsolidated Real Estate Funds [Member] - Property Fund VII [Member] - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investment Holdings [Line Items]
Real estate investments	$ 31,126	$ 32,943
Cash and cash equivalents	1,022	138
Total assets	32,148	33,081
Other liabilities	1,145	1,058
Total liabilities	1,145	1,058
Equity	31,003	32,023
Total liabilities and partners’ deficit	$ 32,148	$ 33,081