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Schedule of Issued Capital (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 CAD ($) shares
Disclosure Of Classes Of Share Capital [Abstract] |
Beginning balance, shares | shares | 293,238,858
Issued on redemption of non-management directors' DSUs, shares | shares | 476,978
Options exercised – cash consideration, shares | shares | 66,000
Ending balance, shares | shares | 293,781,836
Beginning balance | $ 2,319,293
Issued on redemption of non-management directors' DSUs | 2,609
Options exercised – cash consideration | 275
– reclassification from contributed surplus | 103
Ending balance | $ 2,322,280

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