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Operating Segments Information - Summary of Geographical Information (Detail) $ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2018 TWD ($)
Disclosure of geographical areas [line items] |  |  |  |  |
Operating revenue | $ 12,123,242 | $ 371,092,421 | $ 290,441,208 | $ 274,884,107 |
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets | 10,280,594 |  | 163,752,501 |  | $ 314,689,000
United States [Member] |  |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |  |
Operating revenue | 7,539,731 | 230,791,164 | 196,462,345 | 180,745,837 |
Taiwan [member] |  |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |  |
Operating revenue | 1,490,715 | 45,630,792 | 35,413,647 | 38,868,679 |
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets | 7,512,071 |  | 93,350,839 |  | 229,944,505
Asia [Member] |  |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |  |
Operating revenue | 1,830,484 | 56,031,108 | 30,201,332 | 29,896,304 |
Europe [Member] |  |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |  |
Operating revenue | 1,203,668 | 36,844,258 | 26,445,240 | 23,275,732 |
Other geographical areas [member] |  |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |  |
Operating revenue | 58,644 | $ 1,795,099 | 1,918,644 | $ 2,097,555 |
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets | 839,146 |  | 25,025,498 |  | 25,686,256
China [member] |  |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |  |
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets | $ 1,929,377 |  | $ 45,376,164 |  | $ 59,058,239

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