Reconciliation of Basic and Diluted Earnings (Loss) Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Income (loss) from continuing operations	$ (60,338)	$ (3,570)	$ (145,679)	$ (107,234)
(Income) loss allocated to preferred shares	(5,589)	(3,419)	(10,807)	(6,829)
(Income) loss allocated to noncontrolling interests	50	38	77	93
Income (loss) from continuing operations allocable to common shares	(65,877)	(6,951)	(156,409)	(113,970)
Income (loss) from discontinued operations	0	0	0	0
Net income (loss) allocable to common shares	$ (65,877)	$ (6,951)	$ (156,409)	$ (113,970)
Weighted-average shares outstanding-Basic	69,757,807	49,902,247	65,086,432	47,026,586
Dilutive securities under the treasury stock method	0	0	0	0
Weighted-average shares outstanding-Diluted	69,757,807	49,902,247	65,086,432	47,026,586
Earnings (loss) per share-Basic:
Continuing operations	$ (0.94)	$ (0.14)	$ (2.40)	$ (2.42)
Discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Total earnings (loss) per share-Basic	$ (0.94)	$ (0.14)	$ (2.40)	$ (2.42)
Earnings (loss) per share-Diluted:
Continuing operations	$ (0.94)	$ (0.14)	$ (2.40)	$ (2.42)
Discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Total earnings (loss) per share-Diluted	$ (0.94)	$ (0.14)	$ (2.40)	$ (2.42)