Business Combinations and Acquisitions - Schedule of Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
BUSINESS COMBINATIONS AND ACQUISITIONS
Land, building, tenant improvements and FF&E	$ 71,493	$ 132,990
Acquired lease intangible assets	12,735
Acquired lease intangible liabilities	(1,642)
Mortgages notes payable assumed	(719)	(2,637)
Other liabilities	(1,329)	(1,361)
Net assets acquired	80,538	128,992
Equity/limited partnership unit consideration	(11,228)	(17,461)
New loans	(45,830)	(67,477)
Net cash consideration	$ 23,480	$ 44,054
Price per limited partnership unit issued for acquisition, price one	$ 15.00	$ 14.00	$ 14.00
Price per limited partnership unit issued for acquisition, price two	$ 15.50	$ 15.00