Variable Interest Entities ("VIEs") - Summary of Investments in Unconsolidated Real Estate Funds (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Variable Interest Entity [Line Items]
Investments in unconsolidated real estate funds	$ 28,173
Investment [Member]
Variable Interest Entity [Line Items]
Investments in unconsolidated real estate funds	28,173
Asset Management Fees and Other Receivables [Member]
Variable Interest Entity [Line Items]
Investments in unconsolidated real estate funds	1,680
Maximum Risk of Loss [Member]
Variable Interest Entity [Line Items]
Investments in unconsolidated real estate funds	$ 29,853