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Operating Segments Information - Summary of Geographical Information (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2019
USD ($)
Disclosure of geographical areas [line items]          
Operating revenue $ 413,182,184 $ 13,814,182 $ 371,092,421 $ 290,441,208  
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets 334,926,069   314,689,000   $ 11,197,796
United States [Member]          
Disclosure of geographical areas [line items]          
Operating revenue 245,521,027 8,208,660 230,791,164 196,462,345  
Taiwan [member]          
Disclosure of geographical areas [line items]          
Operating revenue 51,244,470 1,713,289 45,630,792 35,413,647  
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets 239,532,971   229,944,505   8,008,458
Asia [Member]          
Disclosure of geographical areas [line items]          
Operating revenue 75,938,364 2,538,896 56,031,108 30,201,332  
Europe [Member]          
Disclosure of geographical areas [line items]          
Operating revenue 38,613,132 1,290,977 36,844,258 26,445,240  
Other geographical areas [member]          
Disclosure of geographical areas [line items]          
Operating revenue 1,865,191 $ 62,360 1,795,099 $ 1,918,644  
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets 26,645,450   25,686,256   890,854
China [member]          
Disclosure of geographical areas [line items]          
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets $ 68,747,648   $ 59,058,239   $ 2,298,484