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Share-based Payment Arrangements - Summary of Information About ASE Mauritius Inc. Option Plan (Detail) - ASE Mauritius Inc. option plan [member] shares in Thousands, pure in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Number of options, beginning balance | shares | 28,470 | 28,470 | 28,545
Number of options, forfeited | shares | (250) |  | (75)
Number of options, Expired | (28,220) |  |
Number of options, ending balance | shares |  | 28,470 | 28,470
Number of options, exercisable, end of year | shares |  | 28,470 | 28,470
Weighted average exercise price, Beginning balance | $ 1.7 | $ 1.7 | $ 1.7
Weighted average exercise price, Options forfeited | 1.7 |  | 1.7
Weighted average exercise price, Options expired | $ 1.7 |  |
Weighted average exercise price, Ending balance |  | 1.7 | 1.7
Weighted average exercise price, Options exercisable, end of year |  | $ 1.7 | $ 1.7

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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 2017-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_d&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_i&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_vi&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The number of share options exercisable in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph b -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_vii&doctype=Standard -URIDate 2017-03-09 + Details
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