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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		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income (loss) from continuing operations		$ 2,645	$ (8,276)	$ (2,913)	$ (18,108)
Net loss from discontinued operations			(12,133)	(21,124)	(15,026)
Net income (loss)		$ 2,645	$ (20,409)	$ (24,037)	$ (33,134)
Weighted average number of shares outstanding, Basic (in shares)		75,282,042	54,778,046	71,318,930	54,297,536
Weighted average number of shares outstanding, Diluted (in shares)		78,196,959	54,778,046	71,318,930	54,297,536
Basic earnings (loss) per share:
Continuing operations	[1]	$ 0.04	$ (0.15)	$ (0.04)	$ (0.33)
Discontinued operations	[1]		(0.22)	(0.30)	(0.28)
Net income (loss)	[1]	0.04	(0.37)	(0.34)	(0.61)
Diluted earnings (loss) per share:
Continuing operations	[1]	0.03	(0.15)	(0.04)	(0.33)
Discontinued operations	[1]		(0.22)	(0.30)	(0.28)
Net income (loss)	[1]	$ 0.03	$ (0.37)	$ (0.34)	$ (0.61)
[1] Earnings (loss) per share tables may contain summation differences due to rounding.

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