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Other equity interest - Summary of Other Equity Interest (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Disclosure of Other Equity Interest [Line Items]        
Ending balance $ 19,802 $ 705    
Financial statements translation differences of foreign operations [member]        
Disclosure of Other Equity Interest [Line Items]        
Beginning balance (89,682)   $ 14,516 $ 65,593
Adjust Balance on Other Equity Interest       65,593
Currency translation differences - The company 28,352   (104,198) (51,077)
Ending balance (61,330)   (89,682) 14,516
Unrealized gain (loss) on valuation of financial assets at fair value through other comprehensive income [member]        
Disclosure of Other Equity Interest [Line Items]        
Beginning balance 66,386   106,898  
Effect on initial application of IFRS 9       42,843
Adjust Balance on Other Equity Interest       42,843
Evaluation adjustment - The Company 140,199   (52,549) 85,022
Evaluation adjustment - Associates 22,925   5,093 (2,438)
Evaluation adjustment related tax - The Company (34,794)   7,016 (18,529)
Disposal of investment accounted for using equity method     (72)  
Ending balance 194,716   66,386 106,898
Unrealized gain on valuation of available -for-sale financial assets [member]        
Disclosure of Other Equity Interest [Line Items]        
Beginning balance       678
Effect on initial application of IFRS 9       (678)
Unearned employee awards [member]        
Disclosure of Other Equity Interest [Line Items]        
Beginning balance     (1,701) (54,570)
Effect on initial application of IFRS 9       0
Adjust Balance on Other Equity Interest       (54,570)
Employee restricted shares - The company     1,701 52,869
Ending balance       (1,701)
Other reserves [member]        
Disclosure of Other Equity Interest [Line Items]        
Beginning balance (23,296)   119,713 11,701
Effect on initial application of IFRS 9       42,165
Adjust Balance on Other Equity Interest       53,866
Currency translation differences - The company 28,352   (104,198) (51,077)
Employee restricted shares - The company 140,199   1,701 52,869
Evaluation adjustment - The Company     (52,549) 85,022
Evaluation adjustment - Associates 22,925   5,093 (2,438)
Evaluation adjustment related tax - The Company (34,794)   7,016 (18,529)
Disposal of investment accounted for using equity method     (72)  
Ending balance $ 133,386   $ (23,296) $ 119,713