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Share-based Payment Arrangements - Summary of Information About USIE Option Plans (Detail) - USIE option plans [member] shares in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Number of options, beginning balance | shares | 25,556 | 25,933 | 29,695
Number of options, exercised | shares | (8,845) | (377) | (3,762)
Number of options, Ending balance | shares | 16,711 | 25,556 | 25,933
Number of options, exercisable, end of year | shares | 16,711 | 25,556 | 25,933
Weighted average exercise price, Beginning balance | $ | $ 2.2 | $ 2.2 | $ 2.1
Weighted average exercise price, Options exercised | $ | 2.2 | 1.9 | 2.0
Weighted average exercise price, Ending balance | $ | 2.1 | 2.2 | 2.2
Weighted average exercise price, Options exercisable, end of year | $ | $ 2.1 | $ 2.2 | $ 2.2

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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 2018-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_d&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_b_i&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_b_vi&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 45 -Subparagraph b -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_b_vii&doctype=Standard -URIDate 2018-03-16 + Details
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