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Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Classes Of Share Capital [Line Items]    
Dividend per share distributed to owners $ 0.08 $ 0.1
Dividends distributed $ 1,106 $ 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%