Principal Activity and Significant Accounting Policies - Consolidated VIEs (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
ASSETS
Real estate investments	$ 594,509	$ 532,263
Cash and cash equivalents	6,461	643	$ 13,849
Restricted deposits and funded reserves	6,115	6,732
Receivables	3,428	2,953
Prepaid expenses	844	1,581
Financing and lease costs, less accumulated amortization of $17 in 2015	4,621	3,761
Intangible assets, less accumulated amortization of $694 in 2015	18,184	9,222
Total Assets	645,756	567,021
LIABILITIES
Mortgage notes payable	383,292	324,886
Special assessments payable	1,659	934
Tenant security deposits payable	3,763	3,113
Unfavorable leases, less accumulated amortization of $42 in 2015	2,253	806
Accounts payable-trade	819	1,486
Accrued expenses and other liabilities	6,631	5,471
Total Liabilities	$ 405,329	$ 361,387