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, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net income (loss)	$ (19,010)	$ (60,338)	$ (26,433)	$ (145,679)
(Income) loss allocated to preferred shares	(7,415)	(5,589)	(13,221)	(10,807)
(Income) loss allocated to noncontrolling interests	775	50	(583)	77
Net income (loss) allocable to common shares	$ (25,650)	$ (65,877)	$ (40,237)	$ (156,409)
Weighted-average shares outstanding-Basic	81,778,947	69,757,807	80,636,895	65,086,432
Dilutive securities under the treasury stock method	0	0	0	0
Weighted-average shares outstanding-Diluted	81,778,947	69,757,807	80,636,895	65,086,432
Earnings (loss) per share-Basic:
Earnings (loss) per share-Basic	$ (0.31)	$ (0.94)	$ (0.50)	$ (2.40)
Earnings (loss) per share-Diluted:
Earnings (loss) per share-Diluted	$ (0.31)	$ (0.94)	$ (0.50)	$ (2.40)