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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, 2020
Dec. 31, 2019
Disclosure of financial assets [Line Items]    
Beginning balance $ 1,550 $ 1,657
Charge for the year 227 72
Write-off (339) (1)
Unused amounts reversed (147) (194)
Currency translation adjustment 102 19
Reclassification 21 (3)
Ending balance $ 1,414 $ 1,550