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Other reserve - Summary of Other Reserve (Detail)
$ 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 Other Reserve [Line Items]        
Employee restricted shares - The company     $ (1,701)  
Disposal of investment in associates $ 973,609 $ 32,551   $ 16,929
Foreign currency translation reserve [member]        
Disclosure of Other Reserve [Line Items]        
Beginning balance 14,516   65,593 10,600
Adjust Balance on Other Reserve     65,593  
Currency translation differences - The company (104,198)   (51,077) (232,652)
Currency translation differences - Disposal of a subsidiary       287,645
Ending balance (89,682)   14,516 65,593
Amounts recognized in other comprehensive income (loss) and accumulated in equity relating to non-current assets held for sale [member]        
Disclosure of Other Reserve [Line Items]        
Beginning balance       287,645
Currency translation differences - Disposal of a subsidiary       (287,645)
Unrealized gain (loss) on valuation of financial assets at fair value through other comprehensive income [member]        
Disclosure of Other Reserve [Line Items]        
Beginning balance 106,898    
Effect on initial application of IFRS 9     42,843  
Adjust Balance on Other Reserve     42,843  
Evaluation adjustment - The Company (52,549)   85,022  
Evaluation adjustment - Associates 5,093   (2,438)  
Evaluation adjustment related tax - The Company 7,016   (18,529)  
Disposal of investment in associates (72)      
Ending balance 66,386   106,898
Unrealized gain on valuation of available -for-sale financial assets [member]        
Disclosure of Other Reserve [Line Items]        
Beginning balance     678  
Effect on initial application of IFRS 9     (678)  
Evaluation adjustment - Associates       678
Ending balance       678
Unearned employee awards [member]        
Disclosure of Other Reserve [Line Items]        
Beginning balance (1,701)   (54,570) (200,204)
Effect on initial application of IFRS 9     0  
Adjust Balance on Other Reserve     (54,570)  
Employee restricted shares - The company 1,701   52,869 145,634
Ending balance     (1,701) (54,570)
Other reserves [member]        
Disclosure of Other Reserve [Line Items]        
Beginning balance 119,713   11,701 98,041
Effect on initial application of IFRS 9     42,165  
Adjust Balance on Other Reserve     53,866  
Currency translation differences - The company (104,198)   (51,077) (232,652)
Employee restricted shares - The company 1,701   52,869 145,634
Evaluation adjustment - The Company (52,549)   85,022  
Evaluation adjustment - Associates 5,093   (2,438) 678
Evaluation adjustment related tax - The Company 7,016   (18,529)  
Disposal of investment in associates (72)      
Ending balance $ (23,296)   $ 119,713 $ 11,701