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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, 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 | 25,933 | 29,695 | 34,159
Number of options, forfeited | shares |  |  | (84)
Number of options, exercised | shares | (377) | (3,762) | (4,380)
Number of options, ending balance | shares | 25,556 | 25,933 | 29,695
Number of options, exercisable, end of year | shares | 25,556 | 25,933 | 28,106
Weighted average exercise price, Beginning balance | $ | $ 2.2 | $ 2.1 | $ 2.1
Weighted average exercise price, Options forfeited | $ |  |  | 2.8
Weighted average exercise price, Options exercised | $ | 1.9 | 2.0 | 1.9
Weighted average exercise price, Ending balance | $ | 2.2 | 2.2 | 2.1
Weighted average exercise price, Options exercisable, end of year | $ | $ 2.2 | $ 2.2 | $ 2.1

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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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- Definition The number of share options forfeited 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 iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_iii&doctype=Standard -URIDate 2017-03-09 + Details
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