COMMITMENTS AND CONTINGENCIES (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) lease option Fund	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Loss Contingencies [Line Items]
Rent expense, net of subleases	$ 2,200,000	$ 1,900,000	$ 1,400,000
Management fee expense	1,200,000
Unfunded capital commitments	$ 5,100,000
Unfunded capital commitments, number | Fund	5
Unfunded capital commitments, period	2 years
Other commitment	$ 183,000
RRE Opportunity REIT [Member]
Loss Contingencies [Line Items]
Cumulative funded equity in fund	2,000,000
Apartment REIT III [Member]
Loss Contingencies [Line Items]
Cumulative funded equity in fund	$ 200,000
Investment commitment (in hundredths)	1.00%
Equity raised in fund	$ 100,000,000
Original maximum investment commitment	2,000,000
Pearlmark Real Estate Partners [Member]
Loss Contingencies [Line Items]
Equity raised in fund	8,000,000
Original maximum investment commitment	$ 6,000,000.0
Internal rate of return	10.00%
Resource Securities [Member]
Loss Contingencies [Line Items]
Minimum net capital required	$ 259,000	100,000
Net capital	1,000,000	1,400,000
Minimum requirement of net capital exceeded by	$ 780,000	$ 1,300,000
New York Lease Property [Member]
Loss Contingencies [Line Items]
Potential extended additional term	5 years
Philadelphia Lease Property [Member]
Loss Contingencies [Line Items]
Potential extended additional term	5 years
Number of operating leases | lease	1
Number of options to extend lease term | option	1
Maximum [Member]
Loss Contingencies [Line Items]
Clawback liability, percentage	75.00%