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Share-based Payment Arrangements - Summary of Information About ASE Inc. Option Plans (Detail) - The Company Option Plans [member] shares in Thousands | 12 Months Ended
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Dec. 31, 2021 shares $ / shares | Dec. 31, 2020 shares $ / shares | Dec. 31, 2019 shares $ / shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Number of options, beginning balance | shares | 144,767 | 170,786 | 183,814
Number of options, forfeited | shares | (5,907) | (3,949) | (4,214)
Number of options, expired | shares | 0 | (1,006) |
Number of options, exercised | shares | (42,058) | (21,064) | (8,814)
Number of options, Ending balance | shares | 96,802 | 144,767 | 170,786
Number of options, exercisable, end of year | shares | 49,696 | 67,388 | 33,822
Weighted average exercise price, Beginning balance | $ / shares | $ 56.9 | $ 57.0 | $ 58.1
Weighted average exercise price, Options expired | $ / shares | 0 | 40.8 |
Weighted average exercise price, Options forfeited | $ / shares | 52.3 | 58.0 | 61.8
Weighted average exercise price, Options exercised | $ / shares | 61.4 | 49.2 | 48.4
Weighted average exercise price, Ending balance | $ / shares | 53.3 | 56.9 | 57.0
Weighted average exercise price, Options exercisable, end of year | $ / shares | $ 55.5 | $ 61.4 | $ 63.5

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- Definition The number of share options outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_d&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_i&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_vi&doctype=Standard -URIDate 2021-03-24 + Details
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