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Operating Segments Information - Summary of Geographical Information (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2021
USD ($)
Disclosure of geographical areas [line items]          
Operating revenue $ 569,997,133 $ 20,547,842 $ 476,978,710 $ 413,182,184  
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets 352,603,791   337,483,610   $ 12,711,023
United States [Member]          
Disclosure of geographical areas [line items]          
Operating revenue 353,500,361 12,743,344 297,117,001 245,521,027  
Taiwan [member]          
Disclosure of geographical areas [line items]          
Operating revenue 94,598,067 3,410,168 64,829,301 51,244,470  
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets 252,525,376   239,353,978   9,103,294
Asia [Member]          
Disclosure of geographical areas [line items]          
Operating revenue 62,523,167 2,253,900 74,447,091 75,938,364  
Europe [Member]          
Disclosure of geographical areas [line items]          
Operating revenue 57,910,641 2,087,622 39,477,306 38,613,132  
Other geographical areas [member]          
Disclosure of geographical areas [line items]          
Operating revenue 1,464,897 $ 52,808 1,108,011 $ 1,865,191  
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets 34,702,992   31,875,938   1,251,009
China [member]          
Disclosure of geographical areas [line items]          
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets $ 65,375,423   $ 66,253,694   $ 2,356,720