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Earnings (Loss) per share - Schedule 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
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss) from continuing operations	$ 4,462	$ (10,761)	$ 1,549	$ (28,869)
Net loss from discontinued operations	0	(3,334)	(21,124)	(18,360)
Net income (loss)	$ 4,462	$ (14,095)	$ (19,575)	$ (47,229)
Weighted average number of shares outstanding:
Basic and diluted (in shares)	78,199,579	55,390,247	73,941,595	54,665,776
Basic and diluted earnings (loss) per share:
Continuing operations (in usd per share)	$ 0.06	$ (0.19)	$ 0.02	$ (0.53)
Discontinued operations (in usd per share)	0.00	(0.06)	(0.29)	(0.34)
Total net income (loss), basic (in usd per share)	$ 0.06	$ (0.25)	$ (0.26)	$ (0.86)

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