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Reconciliation of Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income (loss)	$ 4,836	$ 1,156	$ 11,881	$ 24,922
(Income) loss allocated to noncontrolling interests	(49)	(59)	(173)	(1,009)
Net income (loss) allocable to common shares	$ 4,787	$ 1,097	$ 11,708	$ 23,913
Weighted-average shares outstanding—Basic	87,702,078	71,972,394	86,559,294	69,875,802
Weighted-average shares outstanding—Diluted	88,046,311	72,144,544	86,818,337	70,105,571
Earnings (loss) per share—Basic	$ 0.05	$ 0.02	$ 0.14	$ 0.34
Earnings (loss) per share—Diluted	$ 0.05	$ 0.02	$ 0.13	$ 0.34

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