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Effects on initial application of IFRS 9 - Summary of Carrying Amount of Financial Assets Transferred (Parenthetical) (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Jan. 01, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Disclosure of financial assets [Line Items]            
Financial assets at amortized cost $ 254,801   $ 237,420      
Retained earnings 5,401,569 $ 192,364 4,651,215      
Deferred tax liabilities $ 310,427 $ 11,055 $ 309,129 $ 308,759   $ 174,293
Increase (decrease) due to changes in accounting policy required by IFRSs [member]            
Disclosure of financial assets [Line Items]            
Retained earnings         $ (1,940)  
IAS 39 [member]            
Disclosure of financial assets [Line Items]            
Other financial assets         70,241  
IFRS 9 [member]            
Disclosure of financial assets [Line Items]            
Financial assets at amortized cost         70,241  
IFRS 9 [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]            
Disclosure of financial assets [Line Items]            
Retained earnings         29,077  
Other equity interest         42,165  
Financial assets at fair value through other comprehensive income, category [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]            
Disclosure of financial assets [Line Items]            
Retained earnings         28,584  
Other equity interest         42,165  
Deferred tax liabilities         8,636  
Financial assets at fair value through other comprehensive income, category [member] | IAS 39 [member]            
Disclosure of financial assets [Line Items]            
Available-for-sale financial assets         9,950  
Financial assets at fair value through other comprehensive income, category [member] | IFRS 9 [member]            
Disclosure of financial assets [Line Items]            
Available-for-sale financial assets         89,335  
Financial assets at fair value through profit or loss, category [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]            
Disclosure of financial assets [Line Items]            
Retained earnings         493  
Financial assets at fair value through profit or loss, category [member] | IAS 39 [member]            
Disclosure of financial assets [Line Items]            
Available-for-sale financial assets         10,940  
Financial assets at fair value through profit or loss, category [member] | IFRS 9 [member]            
Disclosure of financial assets [Line Items]            
Available-for-sale financial assets         $ 11,433