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Other Income/Expenses and Adjustments - Summary of Depreciation, Amortization and Lease Expense Included in Consolidated Income Statements (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Other Operating Income Expense [Line Items]      
Amortization of prepaid land lease payments $ 35 $ 57 $ 59
Depreciation – investment property 35 24  
Minimum lease payments recognised as an operating lease expense 35 57  
Depreciation, amortization and lease expense 6,230 6,377 6,569
Included in cost of sales [Member]      
Disclosure Of Other Operating Income Expense [Line Items]      
Depreciation – tangible assets 4,148 4,633 4,720
Amortization – intangible assets 9 7 5
Included in selling expenses [Member]      
Disclosure Of Other Operating Income Expense [Line Items]      
Depreciation – tangible assets 132 178 167
Included in general and administrative expenses [Member]      
Disclosure Of Other Operating Income Expense [Line Items]      
Depreciation – tangible assets 657 616 695
Amortization – intangible assets 40 39 31
Amortization of prepaid land lease payments 35 57 59
Depreciation – investment property 35 24 16
Minimum lease payments recognised as an operating lease expense $ 1,174 $ 823 $ 876