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Trade Receivables, Net - Summary of Movement of Allowance for Doubtful Trade Receivables (Detail) - Trade receivables [member]
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Disclosure of financial assets [Line Items]        
Beginning balance $ 155,389 $ 5,195 $ 64,901 $ 53,709
Impairment losses recognized       13,629
Net remeasurement of loss allowance (38,277) (1,280) 150,128  
Reclassification to loss allowance of other receivables (5,877) (196)    
Acquisition through business combinations 25,553 855 3,482  
Amounts written off     (60,109) (34)
Effect of foreign currency exchange differences (291) (10) (3,013) (2,403)
Ending balance $ 136,497 $ 4,564 155,389 64,901
Impaired individually [member]        
Disclosure of financial assets [Line Items]        
Beginning balance     25,130 16,453
Impairment losses recognized       9,527
Effect of foreign currency exchange differences       (850)
Ending balance       25,130
Impaired collectively [member]        
Disclosure of financial assets [Line Items]        
Beginning balance     $ 39,771 37,256
Impairment losses recognized       4,102
Amounts written off       (34)
Effect of foreign currency exchange differences       (1,553)
Ending balance       $ 39,771