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Financial Risk Management and Fair Values of Financial Instruments - Summary of Movements in Relation to Loss Allowance for Contract Assets, Accounts Receivable and Other Receivables (Detail) - TWD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [Line Items]    
Financial assets beginning balance $ 9,932,223  
Financial assets ending balance 9,642,833 $ 9,932,223
Contract assets [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Financial assets beginning balance (135)  
Provision for impairment loss 0 (20)
Reversal of impairment loss 21  
Financial assets ending balance (114) (135)
Contract assets [member] | IFRS 9 [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Financial assets beginning balance   (115)
Adjustments for applying new standards   (115)
Accounts and notes receivable including related parties [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Financial assets beginning balance (2,141)  
Provision for impairment loss 0 (322)
Reversal of impairment loss 790  
Financial assets ending balance (1,351) (2,141)
Accounts and notes receivable including related parties [member] | IFRS 9 [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Financial assets beginning balance   (1,819)
Adjustments for applying new standards   (1,819)
Other receivable including related parties [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Financial assets beginning balance (13)  
Provision for impairment loss (5) (7)
Reversal of impairment loss 0 1
Financial assets ending balance $ (18) (13)
Other receivable including related parties [member] | IFRS 9 [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Financial assets beginning balance   (7)
Adjustments for applying new standards   $ (7)