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Income and Expenses Items - Summary of Depreciation, Amortization and Lease Expense Included in Consolidated Income Statements (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Other Operating Income Expense [Line Items]      
Amortization of prepaid land lease payments $ 38 $ 35 $ 57
Depreciation – investment property 35 35  
Operating lease expenses 38 35  
Depreciation, amortization and lease expense 5,418 5,465 6,377
Included in cost of sales [Member]      
Disclosure Of Other Operating Income Expense [Line Items]      
Depreciation – tangible assets 4,162 4,148 4,633
Amortization – intangible assets 9 9 7
Operating lease expenses 16 15  
Included in general and administrative expenses [Member]      
Disclosure Of Other Operating Income Expense [Line Items]      
Depreciation – tangible assets 598 657 616
Amortization – intangible assets 34 40 39
Amortization of prepaid land lease payments 38 35 57
Depreciation – investment property 35 35 24
Operating lease expenses 200 201 823
Included in selling expenses [Member]      
Disclosure Of Other Operating Income Expense [Line Items]      
Depreciation – tangible assets 141 132 $ 178
Amortization – intangible assets 1    
Operating lease expenses $ 184 $ 193