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Other equity interest - Summary of Other Equity Interest (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Disclosure of Other Equity Interest [Line Items]        
Beginning balance $ 133,386      
Ending balance 221,840 $ 7,997 $ 133,386  
Financial statements translation differences of foreign operations [member]        
Disclosure of Other Equity Interest [Line Items]        
Beginning balance (61,330)   (89,682) $ 14,516
Currency translation differences - The company (24,695)   28,352 (104,198)
Ending balance (86,025)   (61,330) (89,682)
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 194,716   66,386 106,898
Evaluation adjustment - The Company 122,514   140,199 (52,549)
Evaluation adjustment - Associates 21,094   22,925 5,093
Evaluation adjustment related tax - The Company (30,459)   (34,794) 7,016
Disposal of investment accounted for using equity method       (72)
Ending balance 307,865   194,716 66,386
Unearned employee awards [member]        
Disclosure of Other Equity Interest [Line Items]        
Beginning balance       (1,701)
Employee restricted shares - The company       1,701
Other equity interest [member]        
Disclosure of Other Equity Interest [Line Items]        
Beginning balance 133,386   (23,296) 119,713
Currency translation differences - The company (24,695)   28,352 (104,198)
Employee restricted shares - The company       1,701
Evaluation adjustment - The Company 122,514   140,199 (52,549)
Evaluation adjustment - Associates 21,094   22,925 5,093
Evaluation adjustment related tax - The Company (30,459)   (34,794) 7,016
Disposal of investment accounted for using equity method       (72)
Ending balance $ 221,840   $ 133,386 $ (23,296)