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Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Oct. 31, 2017
Dec. 31, 2017
Disclosure Of Classes Of Share Capital [Line Items]    
Dividend per share paid $ 0.1  
Treasury shares excluded from payment of dividends 11,100  
Dividends paid $ 1,382  
Bottom of range [Member]    
Disclosure Of Classes Of Share Capital [Line Items]    
Intended percentage of net post-tax audited consolidated profits attributable to shareholders to pay for cash dividends   25.00%