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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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income (loss)	$ 3,545	$ 19,521	$ 7,045	$ 23,766
(Income) loss allocated to noncontrolling interests	(36)	(782)	(124)	(950)
Net income (loss) allocable to common shares	$ 3,509	$ 18,739	$ 6,921	$ 22,816
Weighted-average shares outstanding—Basic	86,644,716	68,832,855	85,978,431	68,810,131
Weighted-average shares outstanding—Diluted	86,908,978	68,943,869	86,208,502	69,007,862
Earnings (loss) per share—Basic	$ 0.04	$ 0.27	$ 0.08	$ 0.33
Earnings (loss) per share—Diluted	$ 0.04	$ 0.27	$ 0.08	$ 0.33

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