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Equity - Summary of Outstanding Units (Detail) pure in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of units outstanding | 7,058 | 7,467
Number of units vested | 5,011 | 4,062
Deferred share unit (DSUs) [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of units outstanding | 2,648 | 2,597
Number of units vested | 2,423 | 2,119
Restricted share units (RSUs) [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of units outstanding | 2,823 | 3,316
Number of units vested | 1,699 | 1,327
Performance share units (PSUs) [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of units outstanding | 1,517 | 1,554
Number of units vested | 869 | 616
Performance deferred share units (PDSUs) [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of units outstanding | 70 |
Number of units vested | 20 |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + Details
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