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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 - Additional Information (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Jan. 01, 2018
TWD ($)
Disclosure of initial application of standards or interpretations [line items]          
Contract assets   $ 377,869   $ 299,835 $ 254,997
Retained earnings   4,651,215 $ 155,507 3,602,663  
Deferred tax assets $ 212,372 $ 194,552 $ 6,505 $ 226,716  
VIGOUR TECHNOLOGY Corporation [member]          
Disclosure of initial application of standards or interpretations [line items]          
Impairment loss of investments $ 41,336        
Increase (decrease) due to changes in accounting policy required by IFRSs [member]          
Disclosure of initial application of standards or interpretations [line items]          
Contract assets         (115)
Accounts receivable         (1,819)
Other receivables         (5)
Other receivables-related parties         (2)
Retained earnings         (1,940)
Deferred tax assets         $ 1