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Operating Segments Information - Summary of Geographical Information (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2022
USD ($)
Disclosure of geographical areas [line items]          
Operating revenue $ 670,872,643 $ 21,831,196 $ 569,997,133 $ 476,978,710  
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets 377,857,333   352,603,791   $ 12,296,041
United States [Member]          
Disclosure of geographical areas [line items]          
Operating revenue 446,484,639 14,529,276 353,500,361 297,117,001  
Taiwan [member]          
Disclosure of geographical areas [line items]          
Operating revenue 83,655,142 2,722,263 94,598,067 64,829,301  
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets 268,036,245   252,525,376   8,722,299
Asia [Member]          
Disclosure of geographical areas [line items]          
Operating revenue 75,991,902 2,472,890 62,523,167 74,447,091  
Europe [Member]          
Disclosure of geographical areas [line items]          
Operating revenue 63,542,468 2,067,767 57,910,641 39,477,306  
Other geographical areas [member]          
Disclosure of geographical areas [line items]          
Operating revenue 1,198,492 $ 39,001 1,464,897 $ 1,108,011  
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets 40,537,349   34,702,992   1,319,146
China [member]          
Disclosure of geographical areas [line items]          
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets $ 69,283,739   $ 65,375,423   $ 2,254,596