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Investments accounted for using equity method - Summarized Financial Information for Investment in Material Associates (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2020
USD ($)
Disclosure of associates [line items]          
Current assets $ 12,356,103   $ 11,762,346   $ 440,032
Non-current assets 22,724,711   22,543,541   809,285
Current liabilities (5,725,631)   (5,018,861)   (203,904)
Non-current liabilities (8,639,344)   (9,756,441)   $ (307,669)
Carrying amount 3,271,677   3,392,910    
Revenue 23,011,381 $ 819,493 20,337,881 $ 18,480,027  
Other comprehensive (loss) income, net of income tax 115,308 4,107 (127,266) (32,829)  
Total comprehensive income for the year, net of income tax 2,494,286 $ 88,828 2,381,308 1,292,995  
Unimos Shanghai [member]          
Disclosure of associates [line items]          
Current assets 2,438,725   3,042,377    
Non-current assets 3,905,089   3,499,819    
Current liabilities (618,949)   (459,502)    
Non-current liabilities (248,583)   (448,929)    
Total net assets 5,476,282   5,633,765    
Share in associate's net assets 2,465,651   2,536,558    
Depreciable assets 533,139   584,441    
Goodwill 22,118   22,118    
Carrying amount 3,020,908   3,143,117    
Revenue 1,739,880   1,584,648 1,334,196  
Profit (loss) for the year from continuing operations (246,220)   (352,008) (629,303)  
Other comprehensive (loss) income, net of income tax 0        
Total comprehensive income for the year, net of income tax (246,220)   (352,008) (629,303)  
Dividends received from the associate 0        
Individually Immaterial Associates [member]          
Disclosure of associates [line items]          
Carrying amount 250,769   249,793    
Profit (loss) for the year from continuing operations 14,833   63,838 41,933  
Other comprehensive (loss) income, net of income tax 23,143   5,732 (2,687)  
Total comprehensive income for the year, net of income tax $ 37,976   $ 69,570 $ 39,246