Real Estate Fund Investments - Summary of Investment in Unconsolidated Real Estate Fund and Income from Fund Investments (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)
Our Share of Investments:
Investments in unconsolidated real estate funds	$ 25,798	$ 25,798
Income (loss) from unconsolidated real estate funds	(960)	(1,286)
Net investment loss [Member]
Our Share of Investments:
Income (loss) from unconsolidated real estate funds	(69)	(607)
Net unrealized losses [Member]
Our Share of Investments:
Income (loss) from unconsolidated real estate funds	(2,807)	(2,578)
Carried interest [Member]
Our Share of Investments:
Income (loss) from unconsolidated real estate funds	1,916	1,899
Property Funds [Member]
Our Share of Investments:
Investments in unconsolidated real estate funds	22,874	22,874
Alternative Investment Fund [Member]
Our Share of Investments:
Investments in unconsolidated real estate funds	$ 2,924	$ 2,924