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Equity - Summary of Outstanding Units (Detail) pure in Thousands	12 Months Ended
	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.

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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
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-URIDate 2017-03-09

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- Definition

The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement.

+ References

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-URIDate 2017-03-09

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