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Segment Information - Additional Information (Detail) $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($)
Disclosure of operating segments [Line Items] |  |  |
Long-lived assets | $ 371,568 | $ 12,536 | $ 365,295
Information about major customers | Company did not have any single customer whose revenue exceeded 10% of the total revenues |  |
Overseas [Member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Long-lived assets | $ 4,445 |  | $ 3,947

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