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Business Combinations - Summary of Net Cash Outflow (Inflow) on Acquisition of Subsidiary (Detail) $ in Thousands, $ in Thousands | 12 Months Ended |
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Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2019 USD ($)
Disclosure of detailed information about business combination [Line Items] |  |  |  |
Less: Cash and cash equivalent acquired |  |  | $ 29,133 |
Net cash outflow (inflow) on acquisition of subsidiaries |  |  | $ 7,046,464 |
Siliconware Precision Industries Co., Ltd. [member] |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |
Total consideration | $ 168,440,585 |  |  |
Less: Payable for consideration representing the ordinary shares originally held by ASE | (53,109,760) |  |  |
Less: Cash and cash equivalent acquired | (20,088,970) |  |  |
Net cash outflow (inflow) on acquisition of subsidiaries | 95,241,855 |  |  |
Advanced Microelectronic Products Inc. [member] |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |
Total consideration | 250,000 |  |  | $ 8,358
Less: Cash and cash equivalent acquired | (349,496) | $ (11,685) |  |
Net cash outflow (inflow) on acquisition of subsidiaries | (99,496) | (3,327) |  |
ASE Embedded Electronics Inc. [member] |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |
Total consideration | 0 |  |  | 0
Less: Cash and cash equivalent acquired | (23,197) | (775) |  |
Net cash outflow (inflow) on acquisition of subsidiaries | (23,197) | (775) |  |
UGPL [Member] |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |
Total consideration | 313,057 |  |  | $ 10,467
Less: Cash and cash equivalent acquired | (108,718) | (3,635) |  |
Net cash outflow (inflow) on acquisition of subsidiaries | $ 204,339 | $ 6,832 |  |

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- Definition The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2019-01-01 -Paragraph B64 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2019-en-r&anchor=para_B64_f&doctype=Appendix&subtype=B -URIDate 2019-03-27 + Details
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- Definition The amount of cash and cash equivalents in subsidiaries or other businesses over which control is obtained or lost. [Refer: Subsidiaries [member]; Cash and cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 40 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_40_c&doctype=Standard -URIDate 2019-03-27 + Details
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