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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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income (loss)	$ 1,156	$ 2,407	$ 24,922	$ 33,151
(Income) loss allocated to non-controlling interests	(59)	(140)	(1,009)	(1,972)
Net income (loss) allocable to common shares	$ 1,097	$ 2,267	$ 23,913	$ 31,179
Weighted-average shares outstanding—Basic	71,972,394	47,215,918	69,875,802	47,164,543
Weighted-average shares outstanding—Diluted	72,144,544	47,314,629	70,105,571	47,190,139
Basic	$ 0.02	$ 0.05	$ 0.34	$ 0.66
Diluted	$ 0.02	$ 0.05	$ 0.34	$ 0.66

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