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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 - Aging of Accounts Receivable which are Past Due But Not Impaired (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 that are either past due or impaired [line items]          
Accounts and notes receivable $ 4,453,669 $ 148,902 $ 4,747,288    
Accounts receivable [member]          
Disclosure of financial assets that are either past due or impaired [line items]          
Accounts and notes receivable 4,454,255   4,747,834 $ 4,013,705  
Financial assets past due but not impaired [member] | Accounts receivable [member]          
Disclosure of financial assets that are either past due or impaired [line items]          
Accounts and notes receivable         $ 15,872
Within 1 month [member] | Accounts receivable [member]          
Disclosure of financial assets that are either past due or impaired [line items]          
Accounts and notes receivable 13,733   18,807    
Within 1 month [member] | Financial assets past due but not impaired [member] | Accounts receivable [member]          
Disclosure of financial assets that are either past due or impaired [line items]          
Accounts and notes receivable         10,482
1 - 2 months [member] | Accounts receivable [member]          
Disclosure of financial assets that are either past due or impaired [line items]          
Accounts and notes receivable $ 441   131,787    
1 - 2 months [member] | Financial assets past due but not impaired [member] | Accounts receivable [member]          
Disclosure of financial assets that are either past due or impaired [line items]          
Accounts and notes receivable         477
2 - 3 months [member] | Accounts receivable [member]          
Disclosure of financial assets that are either past due or impaired [line items]          
Accounts and notes receivable     1,436    
2 - 3 months [member] | Financial assets past due but not impaired [member] | Accounts receivable [member]          
Disclosure of financial assets that are either past due or impaired [line items]          
Accounts and notes receivable         426
3 - 4 months [member] | Accounts receivable [member]          
Disclosure of financial assets that are either past due or impaired [line items]          
Accounts and notes receivable     180    
3 - 4 months [member] | Financial assets past due but not impaired [member] | Accounts receivable [member]          
Disclosure of financial assets that are either past due or impaired [line items]          
Accounts and notes receivable         1,431
Over 4 months [member] | Accounts receivable [member]          
Disclosure of financial assets that are either past due or impaired [line items]          
Accounts and notes receivable     $ 324    
Over 4 months [member] | Financial assets past due but not impaired [member] | Accounts receivable [member]          
Disclosure of financial assets that are either past due or impaired [line items]          
Accounts and notes receivable         $ 3,056