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Trade Receivables, Net - Summary of Trade Receivables, Net (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Disclosure of financial assets [Line Items]      
Trade receivables $ 91,207,576 $ 3,248,133 $ 76,918,783
At FVTOCI 626,413 22,308 2,029,690
Total trade receivable 91,833,989 3,270,441 78,948,473
Cost [member]      
Disclosure of financial assets [Line Items]      
Trade receivables 91,304,934 3,251,600 77,055,280
Allowance for doubtful debts [member]      
Disclosure of financial assets [Line Items]      
Trade receivables $ 97,358 $ 3,467 $ 136,497