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Financial Risk Management Objectives - Summary of Capital Management (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Objectives Policies And Processes For Managing Capital [Abstract]        
Interest-bearing loans and borrowings $ 24,814 $ 41,151    
Trade and other payables 21,127 28,850    
Less: cash and cash equivalents (60,778) (46,093) $ (48,231) $ (51,303)
Net debt (14,837) 23,908    
Total equity 221,816 222,826 $ 197,175 $ 193,275
Capital and net debt $ 206,979 $ 246,734    
Gearing ratio (7.20%) 9.70%