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Reconciliation of Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net income (loss)	$ 19,521	$ 30,790	$ 23,766	$ 30,744
(Income) loss allocated to non-controlling interests	(782)	(1,803)	(950)	(1,832)
Net income (loss) allocable to common shares	$ 18,739	$ 28,987	$ 22,816	$ 28,912
Weighted-average shares outstanding—Basic	68,832,855	47,183,804	68,810,131	47,138,573
Weighted-average shares outstanding—Diluted	68,943,869	47,229,736	69,007,862	47,159,220
Basic	$ 0.27	$ 0.61	$ 0.33	$ 0.61
Diluted	$ 0.27	$ 0.61	$ 0.33	$ 0.61

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