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Business Combinations - Additional Information (Detail) $ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 31, 2019 USD ($) | May 31, 2019 TWD ($) | Apr. 30, 2019 TWD ($) shares | Dec. 31, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($) shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($) | Oct. 01, 2021
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |  |
Significant unobservable inputs discount rate |  |  |  | 31.00% | 31.00% |  |  |  |
Revenue from continuing operations |  |  |  | $ 570,363,380 | $ 20,561,045 | $ 497,146,285 |  | $ 413,782,708 |
Profit from continuing operations |  |  |  | $ 62,277,713 | $ 2,245,051 | 28,833,916 |  | $ 18,030,506 |
Call option on the remaining non-controlling interests |  |  |  | 40.00% | 40.00% |  |  |  |
Gain recognized from remeasuring fair value of equity interest before business combination |  |  | $ 243,057 |  |  |  |  |  |
USIFR [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |  |
Percentage of shareholdings acquired by subsidiary |  |  |  |  |  |  |  |  | 100.00%
Percentage of voting equity interests acquired |  |  |  |  |  |  |  |  | 100.00%
Proceeds From Sale Of Restricted Investments |  |  |  |  |  | 385,735 |  |  |
Proceeds from Decommissioning Trust Fund Assets |  |  |  |  |  | 294,244 |  |  |
Proceed From the issue of Other investment |  |  |  |  |  | 91,491 |  |  |
Top of range [member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |  |
Contingent consideration recognised as of acquisition date |  |  |  |  |  | 42,805 |  |  |
USIFR [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |  |
Consideration paid in cash for shares |  |  |  |  |  | 10,800,558 | $ 368,753 |  |
Arrangement for contingent consideration by making deposit to trust fund |  |  |  |  |  | $ 294,244 | $ 10,122 |  |
UGPL [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |  |
Number of shares issued | shares |  |  |  |  |  | 25,940 |  |  |
FAFG [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |  |
Percentage of shareholdings acquired by subsidiary |  |  |  | 100.00% | 100.00% |  |  |  |
Percentage of Ownership (%) |  |  |  |  |  | 100.00% | 100.00% |  |
Percentage of voting equity interests acquired |  |  |  | 100.00% | 100.00% |  |  |  |
A S E Embedded Electronics Inc [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |  |
Consideration paid in cash for shares |  | $ 1,500,000 | 1,147,595 |  |  |  |  |  |
Gain recognized from remeasuring fair value of equity interest before business combination |  |  | 76,655 |  |  |  |  |  |
Ordinary shares acquired |  |  | $ 150,000 |  |  |  |  |  |
Percentage of Ownership (%) | 100.00% |  |  |  |  |  |  |  |
A S E Embedded Electronics Inc [Member] | TDK Corporation [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |  |
Ordinary shares acquired | $ 6,000 |  |  |  |  |  |  |  |
ASE Test, Inc. [member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |  |
Percentage of ownership interest in joint venture |  |  | 50.97% |  |  |  |  |  |
ASE Test, Inc. [member] | Private Placement [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |  |
Shares subscribed | shares |  |  | 100,000 |  |  |  |  |  |
Consideration paid in cash for shares |  |  | $ 250,000 |  |  |  |  |  |
UGPL [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |  |
Percentage of shareholdings acquired by subsidiary |  |  |  | 60.00% | 60.00% |  |  |  |
Percentage of voting equity interests acquired |  |  |  | 60.00% | 60.00% |  |  |  |

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