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Hedging Financial Instruments - Summary of Outstanding Forward Exchange Contracts (Detail) - Hedging instruments [member] € in Millions, $ in Millions | 12 Months Ended |  |
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Dec. 31, 2017 TWD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 EUR (€)
Financial liabilities- current |  |  |
Financial liabilities current |  | $ 155.8 |
Sell NT$/Buy EUR [member] | Bottom of range [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Maturity Date | 2018-02 |  |
Sell NT$/Buy EUR [member] | Top of range [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Maturity Date | 2018-05 |  |
Sell [member] | Sell NT$/Buy EUR [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Contract Amount | $ 2,649.1 |  |
Buy [member] | Sell NT$/Buy EUR [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Contract Amount | € |  |  | € 75.0
Cash flow hedges [member] | Forward exchange contracts [member] |  |  |
Financial assets- current |  |  |
Financial assets current |  | 23.5 |
Financial liabilities- current |  |  |
Financial liabilities current |  | 1.9 |
Fair value hedges [member] | Interest rate futures contracts [member] |  |  |
Financial liabilities- current |  |  |
Financial liabilities current |  | $ 153.9 |

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