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Financial Instruments - Additional Information (Detail) - TWD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items] |  |  |
Percentage of accounts receivable from ten largest customers | 79.00% | 70.00% |
Expected credit loss decreases | $ (1.1) |  |
Level 3 [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Discount for lack of marketability percentage | 10.00% |  |
Decrease in fair value due to lack of marketability increase by 1% | $ (31.4) |  |
Percentage increase in the discount for lack of marketability | 1.00% |  |
Level 3 [member] | Discount rate [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Description of discount rates applied to cash flow projections | 10.00% |  |
Level 3 [member] | Discount for lack of marketability [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Description of discount rates applied to cash flow projections | 10.00% |  |
Level 3 [member] | Discount for lack of control [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Description of discount rates applied to cash flow projections | 10.00% |  |
Equity Price Risk [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Assumed change in risk | (10.00%) |  |
Assumed change in risk, monetary effect | $ (427.1) | $ (703.0) | $ (685.1)
Currency Risk [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Assumed change in risk | (10.00%) |  |
Assumed change in risk, monetary effect | $ (506.4) | (867.9) | (111.3)
Currency Risk [member] | Other comprehensive income [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Assumed change in risk, monetary effect | $ (315.6) | (265.9) |
Interest rate risk [member] | Available-for-sale Fixed Income Securities [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Assumed change in risk | 1.00% |  |
Assumed change in risk, monetary effect | $ (2,450.0) | $ (2,119.7) | $ (1,600.9)
Decrease in net income | $ (247.8) |  |

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