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Trade Receivables, Net - Summary of Trade Receivables, Net (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Disclosure of financial assets [Line Items]      
Trade receivables $ 109,369,478 $ 3,942,673 $ 91,207,576
At FVTOCI 6,092,462 219,627 626,413
Total trade receivable 115,462,210 4,162,300 91,833,989
Cost [member]      
Disclosure of financial assets [Line Items]      
Trade receivables 109,473,101 3,946,399 91,304,934
Allowance for doubtful debts [member]      
Disclosure of financial assets [Line Items]      
Trade receivables $ 103,353 $ 3,726 $ 97,358