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Financial Instruments - Additional Information (Detail) - TWD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items] |  |  |
Increase decrease in fixed income investment fair value | $ (3,143.6) | $ (3,517.4) | $ (2,697.8)
Percentage of accounts receivable from ten largest customers | 79.00% | 79.00% |
Expected credit loss decrease increase | $ 1.1 | $ 0.6 | $ (1.1)
Level 3 [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Discount for lack of marketability percentage | 10.00% | 10.00% |
Decrease in fair value due to lack of marketability increase by 1% | $ (39.0) | $ (34.8) |
Percentage increase in the discount for lack of marketability | 1.00% | 1.00% |
Equity Price Risk [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Assumed change in risk | (10.00%) | (10.00%) | (10.00%)
Assumed change in risk, monetary effect | $ (446.5) | $ (401.9) | $ (427.1)
Currency Risk [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Assumed change in risk | (10.00%) | (10.00%) | (10.00%)
Assumed change in risk, monetary effect | $ (897.7) | $ (2,137.3) | $ (506.4)
Currency Risk [member] | Other comprehensive income [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Assumed change in risk, monetary effect |  | $ (107.7) | $ (315.6)
Interest rate risk [member] | Fixed Income Securities [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Assumed change in risk | 1.00% | 1.00% | 1.00%
Assumed change in risk, monetary effect | $ (3,143.6) | $ (3,516.6) | $ (2,450.0)
Decrease in net income |  | $ (0.8) | $ (247.8)

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