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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

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