Discontinued Operations - Discontinued Operations Include Revenue and Expenses of Previously Owned Facilities (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Discontinued Operations And Disposal Groups [Abstract]
Revenues		$ 411		$ 1,238
Gain (loss) on sale		2,054		2,054
Income		$ 2,374	$ (2)	$ 3,018
Earnings per share/unit - diluted		$ 0.02		$ 0.02