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Equity - Summary of Information Relating to Share Options Outstanding (Detail) pure in Thousands | Dec. 31, 2018 CAD ($) mo | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Outstanding share options | 19,775 | 22,068 | 22,854
Weighted average remaining life of outstanding options | mo | 70 |  |
Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price range | $ 4.15 |  |
Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price range | $ 58.80 |  |
$ 4.15-$12.35 [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Outstanding share options | 6,411 |  |
Weighted average remaining life of outstanding options | mo | 78 |  |
$ 4.15-$12.35 [member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price range | $ 4.15 |  |
$ 4.15-$12.35 [member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price range | $ 12.35 |  |
$12.36-$20.14 [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Outstanding share options | 3,634 |  |
Weighted average remaining life of outstanding options | mo | 71 |  |
$12.36-$20.14 [member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price range | $ 12.36 |  |
$12.36-$20.14 [member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price range | $ 20.14 |  |
$20.15-$26.79 [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Outstanding share options | 2,218 |  |
Weighted average remaining life of outstanding options | mo | 59 |  |
$20.15-$26.79 [member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price range | $ 20.15 |  |
$20.15-$26.79 [member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price range | $ 26.79 |  |
$26.80-$36.85 [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Outstanding share options | 4,386 |  |
Weighted average remaining life of outstanding options | mo | 63 |  |
$26.80-$36.85 [member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price range | $ 26.80 |  |
$26.80-$36.85 [member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price range | $ 36.85 |  |
$36.86-$58.80 [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Outstanding share options | 3,126 |  |
Weighted average remaining life of outstanding options | mo | 68 |  |
$36.86-$58.80 [member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price range | $ 36.86 |  |
$36.86-$58.80 [member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price range | $ 58.80 |  |

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