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Discontinued operations - Disposal of Discontinued Activity (Parenthetical) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Loss From Discontinued Operations Net Of Tax [Abstract]    
Loss from operations of discontinued operations, income taxes $ 0 $ 0
Loss on disposal of discontinued operation, income taxes $ 0 $ 0