Reconciliation of Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net income (loss)	$ 26,405	$ 26,441	$ 15,902	$ 26,707
(Income) loss allocated to preferred shares	(8,615)	(8,221)	(17,135)	(16,080)
(Income) loss allocated to noncontrolling interests	(25,370)	736	(24,191)	1,232
Net income (loss) allocable to common shares	(7,580)	18,956	(25,424)	11,859
Plus: Impact of assumed conversions		617
Net income (loss) allocable to common shares plus assumed conversions	$ (7,580)	$ 19,573	$ (25,424)	$ 11,859
Weighted-average shares outstanding-Basic	91,190,583	82,150,475	91,104,314	82,115,941
Dilutive securities		7,117,987		2,018,099
Weighted-average shares outstanding—Diluted	91,190,583	89,268,462	91,104,314	84,134,040
Earnings (loss) per share-Basic:
Earnings (loss) per share-Basic	$ (0.08)	$ 0.23	$ (0.28)	$ 0.14
Earnings (loss) per share-Diluted:
Earnings (loss) per share-Diluted	$ (0.08)	$ 0.22	$ (0.28)	$ 0.14