Real Estate and Real Estate-Related Investments (Details)	6 Months Ended
	Jun. 30, 2016 real_estate_investment
Real Estate Properties [Line Items]
Number of real estate assets consolidated	8
Gardens Medical Pavilion, South Florida
Real Estate Properties [Line Items]
Ownership Interest (as a percent)	80.90%
Courtyard Kauai at Coconut Beach Hotel
Real Estate Properties [Line Items]
Ownership Interest (as a percent)	80.00%
River Club and the Townhomes at River Club, Athens, Georgia
Real Estate Properties [Line Items]
Ownership Interest (as a percent)	85.00%
Lakes of Margate, Margate, Florida
Real Estate Properties [Line Items]
Ownership Interest (as a percent)	92.50%
Arbors Harbor Town, Memphis, Tennessee
Real Estate Properties [Line Items]
Ownership Interest (as a percent)	94.00%
22 Exchange, Akron, Ohio
Real Estate Properties [Line Items]
Ownership Interest (as a percent)	90.00%
Parkside Apartments, Sugarland, Texas
Real Estate Properties [Line Items]
Ownership Interest (as a percent)	90.00%
Lakewood Flats [Member]
Real Estate Properties [Line Items]
Ownership Interest (as a percent)	100.00%