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Business Combinations - Summary of Impact of Acquisitions by Comprehensive Income (Detail) $ in Thousands, $ in Thousands | 2 Months Ended | 8 Months Ended
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Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($)
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |  |  |
Net Profit (loss) | $ (11,995) | $ (401) |  |  | $ (469,598) | $ (15,700) |
Increase (decrease) due to changes in accounting policy [member] |  |  |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |  |  |
Operating revenue | $ 39,080 | $ 1,307 |  |  | $ (1,159) | $ (39) |
Siliconware Precision Industries Co., Ltd. [member] |  |  |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |  |  |
Net Profit (loss) |  |  |  |  |  |  | $ 7,629,382
Siliconware Precision Industries Co., Ltd. [member] | Increase (decrease) due to changes in accounting policy [member] |  |  |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  | 61,247,727
Advanced Microelectronic Products Inc. [member] |  |  |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |  |  |
Net Profit (loss) |  |  | $ (217,163) | $ (7,261) |  |  |
Advanced Microelectronic Products Inc. [member] | Increase (decrease) due to changes in accounting policy [member] |  |  |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |  |  |
Operating revenue |  |  |  | $ 23,545 |  |  | $ 704,243

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