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Trade Receivables, Net - Summary of Movement of Allowance for Doubtful Trade Receivables (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Disclosure of financial assets [Line Items]        
Impairment losses recognized $ (3,267) $ (100,000)    
Trade receivables [member]        
Disclosure of financial assets [Line Items]        
Beginning balance 2,120 64,901 $ 53,709 $ 82,906
Impairment losses recognized     13,629 (28,022)
Amounts written off (1,964) (60,109) (34)  
Effect of foreign currency exchange differences (98) (3,013) (2,403) (1,175)
Ending balance $ 5,077 155,389 64,901 53,709
Trade receivables [member] | Impaired individually [member]        
Disclosure of financial assets [Line Items]        
Beginning balance   25,130 16,453 39,046
Impairment losses recognized     9,527 (21,501)
Effect of foreign currency exchange differences     (850) (1,092)
Ending balance     25,130 16,453
Trade receivables [member] | Impaired collectively [member]        
Disclosure of financial assets [Line Items]        
Beginning balance   $ 39,771 37,256 43,860
Impairment losses recognized     4,102 (6,521)
Amounts written off     (34)  
Effect of foreign currency exchange differences     (1,553) (83)
Ending balance     $ 39,771 $ 37,256