Variable Interest Entities ("VIEs") - Summary of Investments in Unconsolidated Real Estate Funds (Details) $ in Thousands	Sep. 30, 2016 USD ($)
Variable Interest Entity [Line Items]
Investments in unconsolidated real estate funds	$ 25,521
Investment [Member]
Variable Interest Entity [Line Items]
Investments in unconsolidated real estate funds	25,521
Asset Management Fees and Other Receivables [Member]
Variable Interest Entity [Line Items]
Investments in unconsolidated real estate funds	1,231
Maximum Risk Of Loss [Member]
Variable Interest Entity [Line Items]
Investments in unconsolidated real estate funds	$ 26,752