Segments - Reconciliation of Net Operating Income to Net Income (Detail) - USD ($) $ in Thousands	3 Months Ended								8 Months Ended	12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net operating income	$ 15,819	$ 16,488	$ 15,101	$ 12,702	$ 12,685	$ 11,883	$ 11,212	$ 11,123		$ 26,584	$ 21,379	$ 19,659
Depreciation and amortization										(23,153)	(17,569)	(14,898)
General and administrative expenses										(8,397)	(7,711)	(6,937)
Acquisition, development and other pursuit costs										(1,935)	(229)
Impairment charges										(41)	(15)	(580)
Interest Income										126
Interest expense										(13,333)	(10,648)	(12,303)
Loss on extinguishment of debt										(512)		(2,387)
Gain on real estate dispositions and acquisitions										18,394	2,211	9,460
Other (expense) income										(110)	(113)	297
Income tax provision										34	(70)	(273)
Net income									$ 12,433	31,183	12,759	14,453
Operating Segments
Net operating income										$ 60,110	$ 46,903	$ 42,074