Discontinued Operations and Assets Held For Sale - Schedule of Earnings (Loss) from Discontinued Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Discontinued Operations and Disposal Groups [Abstract]
Revenues from rental properties		$ 5	$ 5	$ 166
Impairments	$ (839)	(2,760)	(1,577)	(4,574)
Other operating income	428	1,039	1,172	1,588
(Loss) from operating activities	(411)	(1,716)	(400)	(2,820)
(Loss) gains from dispositions of real estate	(21)	228	(178)	352
(Loss) from discontinued operations	$ (432)	$ (1,488)	$ (578)	$ (2,468)