Segments - Reconciliation of Net Operating Income to Net Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting [Abstract]
Net operating income	$ 11,212	$ 10,372	$ 22,335	$ 19,827
Depreciation and amortization	(4,057)	(4,020)	(8,026)	(7,179)
General and administrative expenses	(1,981)	(2,857)	(4,027)	(3,574)
Impairment charges		(533)		(533)
Interest expense	(2,678)	(3,289)	(5,243)	(7,204)
Loss on extinguishment of debt		(1,125)		(1,125)
Gain on acquisitions		9,460		9,460
Other (loss) income	(194)	185	(82)	452
Income tax (provision) benefit	(29)	211	(178)	211
Net income	$ 2,273	$ 8,404	$ 4,779	$ 10,335