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Financial Instruments at Fair Value Through Profit or Loss - Summary of Financial Instruments at Fair Value Through Profit or Loss (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL $ 5,288,996 $ 176,830 $ 7,898,458
Current 4,127,566 137,999 7,262,227
Non-current 1,161,430 38,831 636,231
Financial liabilities held for trading 973,571 32,550 36,655
Private-placement convertible bonds [member] | Hybrid financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL     100,496
Quoted ordinary shares [member] | Non derivative financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 3,460,123 115,685 5,151,255
Open-end mutual funds [member] | Non derivative financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 662,290 22,143 581,800
Forward Exchange Contract [member] | Derivative financial instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 104,308 3,487 32,070
Financial liabilities held for trading 110,990 3,711 7,597
Swap contracts [member] | Derivative financial instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 56,561 1,891 1,557,714
Financial liabilities held for trading 862,581 28,839 29,058
Call option [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 24,556 821  
Call option [member] | Derivative financial instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 24,556 821  
Unquoted preferred shares [member] | Non derivative financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 377,440 12,619 275,000
Private-placement funds [member] | Non derivative financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL $ 603,718 $ 20,184 $ 200,123