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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, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income	$ 14,856	$ 2,566	$ 3,545	$ 3,500	$ 17,422	$ 7,045
(Income) loss allocated to noncontrolling interests	(147)		(36)		(173)	(124)
Net income allocable to common shares	$ 14,709		$ 3,509		$ 17,249	$ 6,921
Weighted-average shares outstanding—Basic	89,513,105		86,644,716		89,252,724	85,978,431
Weighted-average shares outstanding—Diluted	90,019,909		86,908,978		89,902,637	86,208,502
Earnings per share—Basic	$ 0.16		$ 0.04		$ 0.19	$ 0.08
Earnings per share—Diluted	$ 0.16		$ 0.04		$ 0.19	$ 0.08

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