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Effects of initial application of IFRS 15 - Additional Information (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2020 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($) | Jan. 01, 2019 TWD ($) | Dec. 31, 2018 TWD ($) | Jan. 01, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
--- | --- | --- | --- | --- | --- | --- | ---
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |  |
Retained earnings | $ 5,401,569 | $ 192,364 | $ 4,651,215 |  |  |  |
Inventories | 2,102,075 | 74,860 | 1,767,642 |  |  |  |
Contract assets | 389,016 |  | 377,869 | $ 299,835 |  |  |
Provision for sales allowance | 3,463 | 123 | 1,998 |  |  |  |
Deferred tax assets | 185,691 | 6,613 | 194,552 |  | $ 226,716 |  | $ 212,372
Deferred tax liabilities | $ 310,427 | $ 11,055 | $ 309,129 |  | $ 308,759 |  | $ 174,293
Increase (decrease) due to application of IFRS 15 [member] |  |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  | $ (8,693) |
Provision for sales allowance |  |  |  |  |  | 70,156 |
Deferred tax assets |  |  |  |  |  | (626) |
Deferred tax liabilities |  |  |  |  |  | 8,067 |
Increase (decrease) due to application of IFRS 15 [member] | Customized products [member] |  |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  | 46,607 |
Inventories |  |  |  |  |  | (208,505) |
Contract assets |  |  |  |  |  | $ 255,112 |

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