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Trade and Other Receivables - Movement in the Loss Allowance on Trade Receivables (Detail) - Trade receivables [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial assets [Line Items]    
Beginning balance $ 1,657 $ 3,456
Charge for the year 72 726
Write-off (1) (2,292)
Unused amounts reversed (194) (156)
Currency translation adjustment 19 (74)
Reclassification (3) (3)
Ending balance $ 1,550 $ 1,657