Earnings per Unit ("EPU") - Computation of Basic and Diluted EPU (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Numerator:
Loss from Continuing Operations	$ (2,144)	$ (12,708)	$ (634)	$ (17,549)
Gain on Sale of Real Estate	0	0	262	0
Preferred Unit Distributions	(2,277)	(4,798)	(6,114)	(9,560)
Redemption of Preferred Units	(3,546)	0	(3,546)	0
Loss from Continuing Operations Available to Unitholders	(7,967)	(17,506)	(10,032)	(27,109)
Income from Discontinued Operations	13,537	2,364	10,637	8,309
Income from Discontinued Operations Allocable to Participating Securities	(42)	0	(78)	0
Income from Discontinued Operations Attributable to Unitholders	13,495	2,364	10,559	8,309
Net Income (Loss) Available	5,570	(15,142)	605	(18,800)
Net Income Allocable to Participating Securities	(42)	0	(78)	0
Net Income (Loss) Available to Unitholders	$ 5,528	$ (15,142)	$ 527	$ (18,800)
Denominator:
Weighted Average Units - Basic and Diluted	112,808	93,106	109,163	92,458
Basic and Diluted EPU:
Loss from Continuing Operations Available to Unitholders	$ (0.07)	$ (0.19)	$ (0.09)	$ (0.29)
Income from Discontinued Operations Attributable to Unitholders	$ 0.12	$ 0.03	$ 0.10	$ 0.09
Net Income (Loss) Available to Unitholders	$ 0.05	$ (0.16)	$ 0.01	$ (0.20)