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Trade and Other Receivables - Aging Analysis of Trade Receivables (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of financial assets [Line Items] |  |
Expected loss rate | 1.69% | 2.05%
Gross carrying amount - trade receivables | $ 83,485 | $ 75,627
Loss allowances | 1,414 | 1,550
Trade receivable, net | $ 82,071 | $ 74,077
Current [Member] |  |
Disclosure of financial assets [Line Items] |  |
Expected loss rate | 0.16% | 0.14%
Gross carrying amount - trade receivables | $ 69,336 | $ 59,867
Loss allowances | 112 | 86
Trade receivable, net | $ 69,224 | $ 59,781
Past due [Member] | Less than 30 days [Member] |  |
Disclosure of financial assets [Line Items] |  |
Expected loss rate | 1.23% | 0.76%
Gross carrying amount - trade receivables | $ 9,557 | $ 9,979
Loss allowances | 118 | 76
Trade receivable, net | $ 9,439 | $ 9,903
Past due [Member] | 31-60 days [Member] |  |
Disclosure of financial assets [Line Items] |  |
Expected loss rate | 2.80% | 3.75%
Gross carrying amount - trade receivables | $ 2,751 | $ 3,759
Loss allowances | 77 | 141
Trade receivable, net | $ 2,674 | $ 3,618
Past due [Member] | 61-90 days [Member] |  |
Disclosure of financial assets [Line Items] |  |
Expected loss rate | 6.92% | 9.52%
Gross carrying amount - trade receivables | $ 159 | $ 294
Loss allowances | 11 | 28
Trade receivable, net | $ 148 | $ 266
Past due [Member] | 91-120 days [Member] |  |
Disclosure of financial assets [Line Items] |  |
Expected loss rate | 15.91% | 23.89%
Gross carrying amount - trade receivables | $ 44 | $ 180
Loss allowances | 7 | 43
Trade receivable, net | $ 37 | $ 137
Past due [Member] | Greater than 120 days [Member] |  |
Disclosure of financial assets [Line Items] |  |
Expected loss rate | 66.48% | 75.97%
Gross carrying amount - trade receivables | $ 1,638 | $ 1,548
Loss allowances | 1,089 | 1,176
Trade receivable, net | $ 549 | $ 372

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