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Trade Receivables, Net - Transfer of Financial Asset (Detail)
€ in Thousands, $ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2019
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
EUR (€)
Receivables Factoring Proceeds [Member] | BNP Paribas [Member]            
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]            
Assets that entity continues to recognise           € 16,691
Receivables Factoring Proceeds [Member] | HSBC [Member]            
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]            
Assets that entity continues to recognise           6,773
Receivables Factoring Proceeds [Member] | Citi Bank Taiwan Limited [Member]            
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]            
Assets that entity continues to recognise | $         $ 94,471  
Receivables Factoring Proceeds [Member] | Standard Chartered Bank [Member]            
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]            
Assets that entity continues to recognise | $         $ 53,800  
Receivables Factoring Proceeds [Member] | First Commercial Bank [Member]            
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]            
Assets that entity continues to recognise | $ $ 6,879     $ 7,567    
Reclassified to Other Receivables [Member] | BNP Paribas [Member]            
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]            
Transferred to other receivables           15,315
Reclassified to Other Receivables [Member] | HSBC [Member]            
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]            
Transferred to other receivables           € 6,456
Advances Received But Unused [Member] | BNP Paribas [Member]            
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]            
Advances received     € 14,481      
Advances Received But Unused [Member] | HSBC [Member]            
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]            
Advances received     5,779      
Advances Received Used [Member] | BNP Paribas [Member]            
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]            
Advances received     1,376      
Advances Received Used [Member] | HSBC [Member]            
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]            
Advances received     € 317      
Advances Received Used [Member] | Citi Bank Taiwan Limited [Member]            
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]            
Advances received | $   $ 94,471        
Advances Received Used [Member] | Standard Chartered Bank [Member]            
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]            
Advances received | $   $ 53,800        
Advances Received Used [Member] | First Commercial Bank [Member]            
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]            
Advances received | $ $ 6,879     $ 7,567    
Interest Rate On Advances Received Against Trade Receivables Sold [Member] | BNP Paribas [Member]            
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]            
Interest rates on advances received 0.80% 0.80% 0.80%      
Interest Rate On Advances Received Against Trade Receivables Sold [Member] | HSBC [Member]            
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]            
Interest rates on advances received 1.45% 1.45% 1.45%      
Interest Rate On Advances Received Against Trade Receivables Sold [Member] | Citi Bank Taiwan Limited [Member] | Maximum [Member]            
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]            
Interest rates on advances received 0.95% 0.95% 0.95%      
Interest Rate On Advances Received Against Trade Receivables Sold [Member] | Citi Bank Taiwan Limited [Member] | Minimum [Member]            
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]            
Interest rates on advances received 0.84% 0.84% 0.84%      
Interest Rate On Advances Received Against Trade Receivables Sold [Member] | Standard Chartered Bank [Member]            
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]            
Interest rates on advances received 0.91% 0.91% 0.91%      
Interest Rate On Advances Received Against Trade Receivables Sold [Member] | First Commercial Bank [Member]            
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]            
Interest rates on advances received 1.95% 1.95% 1.95% 2.20%