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Reconciliation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 3,500	$ 4,245
(Income) loss allocated to non-controlling interests	(88)	(168)
Net income allocable to common shares	$ 3,412	$ 4,077
Weighted-average shares outstanding—Basic	85,303,010	68,787,155
Weighted-average shares outstanding—Diluted	85,535,089	68,958,786
Basic	$ 0.04	$ 0.06
Diluted	$ 0.04	$ 0.06

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