Segments - Reconciliation of Net Operating Income to Net Income (Detail) (USD $)	8 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting [Abstract]
Net operating income		$ 46,903,000	$ 42,074,000	$ 40,832,000
Depreciation and amortization		(17,569,000)	(14,898,000)	(12,909,000)
General and administrative expenses		(7,711,000)	(6,937,000)	(3,232,000)
Acquisition, development and other pursuit costs		(229,000)
Impairment charges		(15,000)	(580,000)
Interest expense		(10,648,000)	(12,303,000)	(16,561,000)
Loss on extinguishment of debt			(2,387,000)
Gain on real estate dispositions and acquisitions		2,211,000	9,460,000
Other (expense) income		(113,000)	297,000	777,000
Income tax provision		(70,000)	(273,000)	0	0
Results from discontinued operations				(10,000)
Net income	$ 12,433,000	$ 12,759,000	$ 14,453,000	$ 8,897,000