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Trade Receivables, Net - Summary of Movements of Loss Allowance of Trade Receivables (Detail) - Trade receivables [member]
$ 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]        
Beginning balance $ 2,120 $ 64,901 $ 53,709 $ 82,906
Net remeasurement of loss allowance 4,905 150,128    
Acquisition through business combinations 114 3,482    
Amounts written off (1,964) (60,109) (34)  
Effects of foreign currency exchange differences (98) (3,013) (2,403) (1,175)
Ending balance $ 5,077 $ 155,389 $ 64,901 $ 53,709