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Equity - Authorized Shares and Common Shares Issued and Fully Paid (Parenthetical) (Detail) - $ / shares | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 08, 2008 | Sep. 07, 2008
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Disclosure Of Classes Of Share Capital [Abstract] |  |  |  |
Common shares par value | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01

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- Definition The nominal value per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_iii&doctype=Standard -URIDate 2017-03-09 + Details
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