Pro Forma Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Business Acquisition [Line Items]
Revenues	$ 27,722		$ 21,301
Net income	$ 140	[1]	$ (150)	[1]

[1] Pro forma results for the three months ended March 31, 2013 were adjusted to exclude non-recurring acquisition costs of approximately $47,000 related to the 2013 acquisition. The pro forma results for the three months ended March 31, 2012 were adjusted to include these costs relating to the 2013 acquisitions. A portion of the 2012 acquisitions were funded by proceeds from the offering of 8.125% Series B Cumulative Redeemable Preferred Stock ("Series B preferred stock") that closed in January 2012. However, pro forma net income for the three months ended March 31, 2012 is not adjusted for this funding as the assumed Series B preferred stock quarterly dividends of approximately $1.9 million are not included in the determination of net income (included only as a reduction of net income (loss) attributable to the common stockholders).