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Hedging Derivative Financial Instruments - Summary of Outstanding Forward Exchange Contracts (Detail) - Sell NT$/Buy EUR [member] € in Millions, $ in Millions | 12 Months Ended |  |
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Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2017 EUR (€) | Dec. 31, 2016 EUR (€)
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Maturity Date |  | 2017-01 |  |
Bottom of range [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Maturity Date | 2018-01 |  |  |
Top of range [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Maturity Date | 2018-02 |  |  |
Hedging instruments [member] | Bottom of range [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Maturity Date | 2018-02 |  |  |
Hedging instruments [member] | Top of range [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Maturity Date | 2018-05 |  |  |
Sell [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Contract Amount | $ | $ 6,002.8 | $ 5,393.3 |  |
Sell [member] | Hedging instruments [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Contract Amount | $ | $ 2,649.1 |  |  |
Buy [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Contract Amount | € |  |  | € 169.0 | € 159.4
Buy [member] | Hedging instruments [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Contract Amount | € |  |  | € 75.0 |

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