Segments - Reconciliation of Net Operating Income to Net Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting [Abstract]
Net operating income	$ 16,488	$ 11,883	$ 44,291	$ 34,218
Depreciation and amortization	(6,317)	(4,567)	(16,991)	(12,593)
General and administrative expenses	(1,873)	(1,741)	(6,297)	(5,768)
Acquisition, development and other pursuit costs	(288)	(174)	(1,050)	(174)
Impairment charges		(15)	(23)	(15)
Interest expense	(3,518)	(2,734)	(9,922)	(7,977)
Loss on extinguishment of debt	(3)		(410)
Gain on real estate dispositions			13,407
Other income (loss)	(34)	59	(182)	(23)
Income tax benefit (provision)	(118)	43	(83)	(135)
Net income	$ 4,337	$ 2,754	$ 22,740	$ 7,533