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Operating Segments Information - Summary of Geographical Information (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2024
USD ($)
Disclosure of geographical areas [line items]          
Operating revenue $ 595,409,585 $ 18,158,267 $ 581,914,471 $ 670,872,643  
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets 416,919,169   369,608,094   $ 12,714,827
United States [Member]          
Disclosure of geographical areas [line items]          
Operating revenue 358,708,176 10,939,560 370,306,818 446,484,639  
Taiwan [member]          
Disclosure of geographical areas [line items]          
Operating revenue 89,274,839 2,722,624 70,492,517 83,655,142  
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets 291,081,213   258,813,497   8,877,134
Asia [Member]          
Disclosure of geographical areas [line items]          
Operating revenue 82,989,985 2,530,954 75,316,422 75,991,902  
Europe [Member]          
Disclosure of geographical areas [line items]          
Operating revenue 63,429,243 1,934,408 65,026,966 63,542,468  
China [member]          
Disclosure of geographical areas [line items]          
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets 70,968,611   66,660,391   2,164,337
Other geographical areas [member]          
Disclosure of geographical areas [line items]          
Operating revenue 1,007,342 $ 30,721 771,748 $ 1,198,492  
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets $ 54,869,345   $ 44,134,206   $ 1,673,356