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Summary of Shares Outstanding Under Share Based Incentive Plans (Detail) | 12 Months Ended
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Dec. 31, 2019 shares Stock_Unit $ / shares | Dec. 31, 2018 shares Stock_Unit $ / shares
Equity-Settled Plans [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Beginning balance | 93,173 | 195,743
Redeemed |  | (102,570)
Ending balance | 93,173 | 93,173
Restricted Share Units (RSUs) [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Beginning balance | Stock_Unit | 4,055,914 | 2,796,858
Granted | Stock_Unit | 4,187,350 | 2,918,912
Redeemed | Stock_Unit | (1,505,683) | (1,404,284)
Forfeited | Stock_Unit | (399,518) | (255,572)
Ending balance | Stock_Unit | 6,338,063 | 4,055,914
Performance Share Units (PSUs) [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Beginning balance | Stock_Unit | 4,542,990 | 5,726,259
Granted | Stock_Unit | 2,038,900 | 1,292,550
Redeemed | Stock_Unit | (1,322,758) | (2,137,163)
Forfeited | Stock_Unit | (1,923,782) | (338,656)
Ending balance | Stock_Unit | 3,335,350 | 4,542,990
Deferred Share Units (DSUs) [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Beginning balance | 1,053,635 | 953,277
Granted | 738,619 | 474,766
Redeemed |  | (374,408)
Ending balance | 1,792,254 | 1,053,635
Executive Performance Share Units [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Beginning balance | 3,191,067 |
Granted | 4,211,600 | 2,082,800
Forfeited | (25,767) | (50,733)
Ending balance | 7,376,900 | 3,191,067
Weighted Fair Value, Granted | $ / shares | $ 4.11 | $ 6.22
Weighted Fair Value, Forfeited | $ / shares | 6.02 | 6.12
Weighted Fair Value, Ending balance | $ / shares | $ 4.98 | $ 6.14

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- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The number of other equity instruments (ie other than share options) forfeited in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard -URIDate 2019-03-27 + Details
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