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Financial Assets and Liabilities at Fair Value through Profit or Loss - Outstanding Forward Exchange Contracts for which Hedge Accounting Treatment is not Applied (Detail) € in Millions, ¥ in Millions, ¥ in Millions, £ in Millions, $ in Millions, $ in Millions | 12 Months Ended |  |
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Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 JPY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 GBP (£) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 EUR (€) | Dec. 31, 2016 JPY (¥) | Dec. 31, 2016 CNY (¥)
Sell NT$/Buy EUR [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Maturity Date |  | 2017-01 |  |  |  |  |  |  |  |  |
Sell NT$/Buy EUR [member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Maturity Date | 2018-01 |  |  |  |  |  |  |  |  |  |
Sell NT$/Buy EUR [member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Maturity Date | 2018-02 |  |  |  |  |  |  |  |  |  |
Sell NT$/Buy EUR [member] | Sell [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Contract Amount | $ | $ 6,002.8 | $ 5,393.3 |  |  |  |  |  |  |  |  |
Sell NT$/Buy EUR [member] | Buy [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Contract Amount | € |  |  |  | € 169.0 |  |  |  |  | € 159.4 |  |
Sell NT$/Buy JPY [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Maturity Date | 2018-02 | 2017-01 |  |  |  |  |  |  |  |  |
Sell NT$/Buy JPY [member] | Sell [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Contract Amount | $ | $ 996.3 | $ 7,314.8 |  |  |  |  |  |  |  |  |
Sell NT$/Buy JPY [member] | Buy [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Contract Amount | ¥ |  |  |  |  | ¥ 3,800.0 |  |  |  |  | ¥ 26,501.8 |
Sell US$/Buy EUR [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Maturity Date |  | 2017-01 |  |  |  |  |  |  |  |  |
Sell US$/Buy EUR [Member] | Sell [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Contract Amount | $ |  |  |  |  |  |  |  | $ 4.2 |  |  |
Sell US$/Buy EUR [Member] | Buy [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Contract Amount | € |  |  |  |  |  |  |  |  | € 4.0 |  |
Sell US$/Buy JPY [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Maturity Date | 2018-01 | 2017-01 |  |  |  |  |  |  |  |  |
Sell US$/Buy JPY [member] | Sell [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Contract Amount | $ |  |  | $ 2.2 |  |  |  |  | 0.4 |  |  |
Sell US$/Buy JPY [member] | Buy [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Contract Amount | ¥ |  |  |  |  | 246.7 |  |  |  |  | ¥ 50.0 |
Sell US$/Buy NT$ [member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Maturity Date | 2018-01 | 2017-01 |  |  |  |  |  |  |  |  |
Sell US$/Buy NT$ [member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Maturity Date | 2018-02 | 2017-02 |  |  |  |  |  |  |  |  |
Sell US$/Buy NT$ [member] | Sell [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Contract Amount | $ |  |  | 1,661.5 |  |  |  |  | 439.0 |  |  |
Sell US$/Buy NT$ [member] | Buy [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Contract Amount | $ | $ 49,673.3 | $ 14,138.2 |  |  |  |  |  |  |  |  |
Sell US$/Buy RMB [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Maturity Date | 2018-01 |  |  |  |  |  |  |  |  |  |
Sell US$/Buy RMB [member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Maturity Date |  | 2017-01 |  |  |  |  |  |  |  |  |
Sell US$/Buy RMB [member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Maturity Date |  | 2017-06 |  |  |  |  |  |  |  |  |
Sell US$/Buy RMB [member] | Sell [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Contract Amount | $ |  |  | $ 558.0 |  |  |  |  | $ 421.8 |  |  |
Sell US$/Buy RMB [member] | Buy [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Contract Amount | ¥ |  |  |  |  |  | ¥ 3,679.6 |  |  |  |  | ¥ 2,908.4
Sell RMB/Buy EUR [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Maturity Date | 2018-01 |  |  |  |  |  |  |  |  |  |
Sell RMB/Buy EUR [member] | Sell [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Contract Amount | ¥ |  |  |  |  |  | 39.0 |  |  |  |  |
Sell RMB/Buy EUR [member] | Buy [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Contract Amount | € |  |  |  | € 5.0 |  |  |  |  |  |  |
Sell RMB/Buy JPY [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Maturity Date | 2018-01 |  |  |  |  |  |  |  |  |  |
Sell RMB/Buy JPY [member] | Sell [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Contract Amount | ¥ |  |  |  |  |  | 409.7 |  |  |  |  |
Sell RMB/Buy JPY [member] | Buy [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Contract Amount | ¥ |  |  |  |  | ¥ 7,062.5 |  |  |  |  |  |
Sell RMB/Buy GBP [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Maturity Date | 2018-01 |  |  |  |  |  |  |  |  |  |
Sell RMB/Buy GBP [member] | Sell [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Contract Amount | ¥ |  |  |  |  |  | ¥ 3.6 |  |  |  |  |
Sell RMB/Buy GBP [member] | Buy [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Contract Amount | £ |  |  |  |  |  |  | £ 0.4 |  |  |  |

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