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Financial Instruments - Summary of Categories of Financial Instruments (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2020 TWD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 TWD ($)
Disclosure of detailed information about financial instruments [line items]
Mandatorily at FVTPL	$ 6,135,793	$ 218,511	$ 5,288,996
Measured at amortized cost (Note 1)	147,521,583	5,253,618	139,668,804
Trade receivables, net	91,833,989	3,270,441	78,948,473
Held for trading	1,537,208	54,744	973,571
Financial liabilities for hedging	11,188,244	398,442	3,233,301
Measured at amortized cost (Note 2)	304,737,749	10,852,485	310,187,110
Financial assets at fair value through other comprehensive income, category [member]
Disclosure of detailed information about financial instruments [line items]
Equity instruments	728,398	25,940	755,903
Debt instruments	1,012,736	36,066	1,014,872
Trade receivables, net	$ 626,413	$ 22,308	$ 2,029,690

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Financial liabilities designated as hedging instruments at fair value through profit or loss

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- Definition

The amount of current debt instruments issued. [Refer: Debt instruments issued]

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The amount of current financial assets mandatorily measured at fair value through profit or loss in accordance with IFRS 9. [Refer: Financial assets at fair value through profit or loss, mandatorily measured at fair value]

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- Definition

The amount of current financial liabilities at fair value through profit or loss that meet the definition of held for trading. [Refer: Current financial liabilities at fair value through profit or loss]

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The amount of current investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: Investments in equity instruments designated at fair value through other comprehensive income]

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The amount of current trade receivables. [Refer: Trade receivables]

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The amount of financial assets at amortised cost. The amortised cost is the amount at which financial assets are measured at initial recognition minus principal repayments, plus or minus the cumulative amortisation using the effective interest method of any difference between that initial amount and the maturity amount, and adjusted for any impairment. [Refer: Financial assets]

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