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Income and Expenses Items - Summary of Employee Benefits Expenses (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Other Operating Income Expense [Line Items]      
Total employee benefits expenses $ 30,137 $ 30,793 $ 30,072
Included in cost of sales [Member]      
Disclosure Of Other Operating Income Expense [Line Items]      
Wages and salaries 14,429 13,674 13,474
Labor and health insurance costs 126 162 168
Pension costs 994 890 869
Other employment benefits 816 892 817
Included in selling expenses [Member]      
Disclosure Of Other Operating Income Expense [Line Items]      
Wages and salaries 3,495 3,685 3,641
Labor and health insurance costs 12 14 14
Pension costs 330 324 325
Other employment benefits 50 68 64
Included in general and administrative expenses [Member]      
Disclosure Of Other Operating Income Expense [Line Items]      
Wages and salaries 8,117 8,818 8,364
Labor and health insurance costs 85 224 219
Pension costs 757 671 656
Director fees 640 1,046 1,119
Other employment benefits $ 286 $ 325 $ 342