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Effects on Initial Application of IFRS 15 and Information for the Year Ended December 31, 2017 in Conformity With IAS 18 - Additional Information (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2018
TWD ($)
Disclosure of initial application of standards or interpretations [line items]            
Retained earnings $ 4,651,215   $ 3,602,663   $ 155,507  
Inventories 1,767,642   1,778,835   59,099  
Contract assets 377,869   299,835     $ 254,997
Provision for sales allowance 1,998   29,352   67  
Deferred tax assets 194,552   226,716 $ 212,372 6,505  
Deferred tax liabilities 309,129   308,759 174,293 $ 10,335  
Revenue 20,337,881 $ 679,969 18,480,027 17,940,855    
Cost of revenue 16,411,742 548,704 15,050,032 14,703,729    
Income tax expense 513,679 $ 17,174 456,618 $ 550,487    
Contract liabilities $ 1,231   1,432     1,152
Increase (decrease) due to application of IFRS 15 [member]            
Disclosure of initial application of standards or interpretations [line items]            
Retained earnings           (8,693)
Inventories     (237,271)      
Contract assets     300,376      
Provision for sales allowance     32,627     70,156
Deferred tax assets     81     (626)
Deferred tax liabilities           8,067
Revenue     300,376      
Cost of revenue     237,271      
Expected credit loss     135      
Foreign exchange loss     406      
Income tax expense     (81)      
Contract liabilities     $ 1,432      
Increase (decrease) due to application of IFRS 15 [member] | Customized products [member]            
Disclosure of initial application of standards or interpretations [line items]            
Retained earnings           46,607
Inventories           (208,505)
Contract assets           $ 255,112