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Income and Expenses Items - Summary of Other Operating Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Analysis Of Income And Expense [Abstract]      
Gain on disposal of property, plant, and equipment $ 88 $ 93 $ 99
Reversal of allowance for trade receivable 122    
Gain on disposal of assets classified as held for sale     4,525
Reversal of allowance for foreseeable loss   507  
Other operating income – others 175 205 460
Total other operating income $ 385 $ 805 $ 5,084