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Other Income/Expenses and Adjustments - Summary of Other Operating Income (Detail)
$ in Thousands, ฿ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
THB (฿)
Dec. 31, 2015
USD ($)
Analysis Of Income And Expense [Abstract]        
Gain on disposal of property, plant, and equipment $ 99 $ 100   $ 41
Gain on disposal of investment property   4,466 ฿ 157 32
Reversal of allowance for related parties   1   16
Gain on disposal of assets classified as held for sale 4,525      
Reversal of allowance for investment properties       12
Gain on sales of scrap copper   569   607
Other operating income - others 460 305   432
Total other operating income $ 5,084 $ 5,441   $ 1,140