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Financial Instruments - Summary of Fair Value of Financial Instruments that are Measured at Fair Value on a Recurring Basis (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2018 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
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Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets designated as at FVTPL |  |  | $ 100,496
Financial assets held for trading |  |  | 5,122,571
Financial assets at fair value through profit or loss | $ 258,035 | $ 7,898,458 | 5,223,067
Available-for-sale financial assets |  |  | 1,212,165
Financial assets mandatorily classified as at FVTPL | 258,035 | 7,898,458 |
Financial assets at FVTOCI | 52,183 | 1,597,323 |
Financial liabilities at FVTPL | 1,197 | 36,655 | 677,430
Swap contracts [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets held for trading |  |  | 60,538
Swap contracts [member] | Derivative financial instruments [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 50,889 | 1,557,714 |
Financial liabilities at FVTPL | 949 | 29,058 | 652,107
Forward Exchange Contract [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets held for trading |  |  | 61,325
Forward Exchange Contract [member] | Derivative financial instruments [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 1,048 | 32,070 |
Quoted ordinary shares [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets held for trading |  |  | 4,410,732
Available-for-sale financial assets |  |  | 279,791
Quoted ordinary shares [member] | Non derivative financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 168,287 | 5,151,255 |
Open-end mutual funds [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets held for trading |  |  | 589,976
Available-for-sale financial assets |  |  | 23,825
Open-end mutual funds [member] | Non derivative financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 19,007 | 581,800 |
Unquoted preferred shares [member] | Non derivative financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 8,984 | 275,000 |
Private-placement funds [member] | Non derivative financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 6,537 | 200,123 |
Private-placement convertible bonds [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets designated as at FVTPL |  |  | 100,496
Private-placement convertible bonds [member] | Hybrid financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 3,283 | 100,496 |
Unquoted ordinary shares [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Available-for-sale financial assets |  |  | 662,477
Financial assets at FVTOCI, Investments in equity instruments | 17,665 | 540,730 |
Limited partnership [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Available-for-sale financial assets |  |  | 246,072
Financial assets at FVTOCI, Investments in equity instruments | 1,296 | 39,669 |
Unsecured subordinate corporate bonds [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at FVTOCI, Investments in debt instruments | 33,222 | 1,016,924 |
Forward exchange contracts [member] | Derivative financial instruments [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities at FVTPL | 248 | 7,597 | 25,323
Level 1 of fair value hierarchy [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at fair value through profit or loss |  |  | 5,000,708
Available-for-sale financial assets |  |  | 303,616
Financial assets mandatorily classified as at FVTPL | 187,294 | 5,733,055 |
Level 1 of fair value hierarchy [member] | Quoted ordinary shares [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets held for trading |  |  | 4,410,732
Available-for-sale financial assets |  |  | 279,791
Level 1 of fair value hierarchy [member] | Quoted ordinary shares [member] | Non derivative financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 168,287 | 5,151,255 |
Level 1 of fair value hierarchy [member] | Open-end mutual funds [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets held for trading |  |  | 589,976
Available-for-sale financial assets |  |  | 23,825
Level 1 of fair value hierarchy [member] | Open-end mutual funds [member] | Non derivative financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 19,007 | 581,800 |
Level 2 of fair value hierarchy [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at fair value through profit or loss |  |  | 222,359
Financial assets mandatorily classified as at FVTPL | 55,220 | 1,690,280 |
Financial liabilities at FVTPL | 1,197 | 36,655 | 677,430
Level 2 of fair value hierarchy [Member] | Swap contracts [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets held for trading |  |  | 60,538
Level 2 of fair value hierarchy [Member] | Swap contracts [member] | Derivative financial instruments [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 50,889 | 1,557,714 |
Financial liabilities at FVTPL | 949 | 29,058 | 652,107
Level 2 of fair value hierarchy [Member] | Forward Exchange Contract [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets held for trading |  |  | 61,325
Level 2 of fair value hierarchy [Member] | Forward Exchange Contract [member] | Derivative financial instruments [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 1,048 | 32,070 |
Level 2 of fair value hierarchy [Member] | Private-placement convertible bonds [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets designated as at FVTPL |  |  | 100,496
Level 2 of fair value hierarchy [Member] | Private-placement convertible bonds [member] | Hybrid financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 3,283 | 100,496 |
Level 2 of fair value hierarchy [Member] | Forward exchange contracts [member] | Derivative financial instruments [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities at FVTPL | 248 | 7,597 | 25,323
Level 3 of fair value hierarchy [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Available-for-sale financial assets |  |  | 908,549
Financial assets mandatorily classified as at FVTPL | 15,521 | 475,123 |
Financial assets at FVTOCI | 52,183 | 1,597,323 |
Level 3 of fair value hierarchy [member] | Unquoted preferred shares [member] | Non derivative financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 8,984 | 275,000 |
Level 3 of fair value hierarchy [member] | Private-placement funds [member] | Non derivative financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 6,537 | 200,123 |
Level 3 of fair value hierarchy [member] | Unquoted ordinary shares [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Available-for-sale financial assets |  |  | 662,477
Financial assets at FVTOCI, Investments in equity instruments | 17,665 | 540,730 |
Level 3 of fair value hierarchy [member] | Limited partnership [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Available-for-sale financial assets |  |  | $ 246,072
Financial assets at FVTOCI, Investments in equity instruments | 1,296 | 39,669 |
Level 3 of fair value hierarchy [member] | Unsecured subordinate corporate bonds [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at FVTOCI, Investments in debt instruments | $ 33,222 | $ 1,016,924 |

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