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Equity - Summary of Class A Common Shares and Class B Subordinate Voting Shares Issued and Outstanding (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2017 shares | Dec. 31, 2016 shares
Disclosure of classes of share capital [line items] |  |
Options exercised | 2,275,000 | 647,000
Class A Common Shares [member] |  |
Disclosure of classes of share capital [line items] |  |
Beginning balance | 9,353,000 | 9,353,000
Class A share conversion | (1,576,166) |
Ending balance | 7,777,000 | 9,353,000
Class B Subordinate Voting Shares [member] |  |
Disclosure of classes of share capital [line items] |  |
Beginning balance | 567,546,000 | 566,899,000
Class A share conversion | 1,576,166 |
Options exercised | 2,275,000 | 647,000
Acquired and cancelled pursuant to normal course issuer bid (h) | (5,891,000) |
Ending balance | 565,506,000 | 567,546,000

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- Definition The number of share options exercised 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 iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_iv&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_iv&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Number of shares acquired and cancelled pursuant to normal course issuer bid. + References No definition available. + Details
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- Definition Number of shares converted. + References No definition available. + Details
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