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Effects on Initial Application of IFRS 9 and Information for the Year Ended December 31, 2017 in Conformity With IAS 39 - Summary of Carrying Amount of Financial Assets Transferred (Parenthetical) (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Jan. 01, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Disclosure of financial assets [Line Items]          
Financial assets at amortized cost $ 237,420   $ 268,271    
Retained earnings 4,651,215 $ 155,507 3,602,663    
Deferred tax liabilities $ 309,129 $ 10,335 $ 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