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Financial Risk Management Objectives - Summary of Capital Management (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure Of Objectives Policies And Processes For Managing Capital [Abstract]        
Interest-bearing loans and borrowings $ 41,151 $ 28,225    
Trade and other payables 28,850 30,023    
Less: cash and cash equivalents (46,093) (48,231) $ (51,303) $ (68,863)
Net debt 23,908 10,017    
Total equity 222,826 197,175 $ 193,275 $ 219,931
Capital and net debt $ 246,734 $ 207,192    
Gearing ratio 9.70% 4.80%