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Reconciliation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income	$ 4,912	$ 14,856	$ 2,566	$ 4,836	$ 3,545	$ 3,500	$ 22,334	$ 11,881
Income allocated to noncontrolling interest	(49)			(49)			(222)	(173)
Net income allocable to common shares	$ 4,863			$ 4,787			$ 22,112	$ 11,708
Weighted-average shares outstanding—Basic	90,027,540			87,702,078			89,513,834	86,559,294
Weighted-average shares outstanding—Diluted	90,691,368			88,046,311			90,234,840	86,818,337
Earnings per share—Basic	$ 0.05			$ 0.05			$ 0.25	$ 0.14
Earnings per share—Diluted	$ 0.05			$ 0.05			$ 0.25	$ 0.13

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