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Shareholders' capital - Stock Option Activity (Detail) CAD / shares in Units, CAD in Thousands | 12 Months Ended
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Dec. 31, 2017 CAD CAD / shares shares | Dec. 31, 2017 CAD $ / shares CAD / shares shares | Dec. 31, 2016 CAD CAD / shares shares | Dec. 31, 2016 $ / shares | Dec. 31, 2015 CAD CAD / shares shares
Number of awards |  |  |  |  |
Beginning balance (in shares) | shares | 6,045,014 |  | 7,164,652 |  |
Granted (in shares) | shares | 2,328,343 |  | 2,596,025 |  |
Exercised (in shares) | shares | (1,634,501) |  | (3,715,663) |  |
Ending balance (in shares) | shares | 6,738,856 |  | 6,045,014 |  | 7,164,652
Exercisable (in shares) | shares | 2,448,689 | 2,448,689 |  |  |
Weighted average exercise price |  |  |  |  |
Beginning balance (CAD per share) | CAD / shares | CAD 9.64 |  | CAD 6.92 |  |
Granted (CAD per share) | CAD / shares | 12.82 |  | 10.85 |  |
Exercised (CAD per share) | $ / shares |  | $ 7.81 |  | $ 5.25 |
Ending balance (CAD per share) | CAD / shares | 11.18 |  | CAD 9.64 |  | CAD 6.92
Exercisable (CAD per share) | CAD / shares | CAD 10.03 | $ 10.03 |  |  |
Additional Disclosures |  |  |  |  |
Outstanding shares, weighted average remaining contractual term | 6 years 3 months 25 days |  | 6 years 3 months 7 days |  | 4 years 8 months 25 days
Granted, weighted average remaining contractual term | 8 years |  | 8 years |  |
Exercised shares, weighted average remaining contractual term | 3 years 9 months 4 days |  | 2 years 21 days |  |
Exercisable , weighted average remaining contractual term | 5 years 7 months 10 days |  |  |  |
Beginning balance, aggregate intrinsic value | CAD | CAD 10,595 |  | CAD 28,561 |  |
Granted, aggregate intrinsic value | CAD |  |  | 0 |  |
Exercised, aggregate intrinsic value | CAD | 7,696 |  | 20,790 |  |
Ending balance, aggregate intrinsic value | CAD | 19,380 |  | CAD 10,595 |  | CAD 28,561
Exercisable , aggregate intrinsic value | CAD | CAD 9,473,719 | $ 9,473,719 |  |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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