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Equity - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 CAD shares | Sep. 30, 2017 CAD | Jun. 30, 2017 CAD | Mar. 31, 2017 | Dec. 31, 2016 USD ($) | Jun. 30, 2016 CAD | Oct. 09, 2018 shares | Dec. 31, 2017 CAD Vote / shares shares | Dec. 31, 2016 CAD shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
Share option, granted |  |  |  |  |  |  |  | 2,011,000 | 8,946,000
Weighted average exercise price | CAD |  |  |  |  |  |  |  | CAD 27.79 | CAD 5.48
Average share price | CAD |  |  |  |  |  |  |  | 27.86 | 17.59
Total share option compensation expense | CAD |  |  |  |  |  |  |  | CAD 17,000,000 | 22,000,000
Description of vesting requirements for share-based payment arrangement |  |  |  |  |  |  |  | PSUs granted prior to 2017 vest in a percentage of the original grant varying from 0% to 200% based on our total shareholder return ranking compared to a group of specified companies. PSUs issued in 2017 vest in a percentage from 0% to 200% based on both relative total shareholder return and a calculation based on the change in EBITDA over the vesting period divided by the change in a weighted commodity price index. Once vested, PSUs entitle the holder to a cash payment equal to the weighted average trading price of one Class B subordinate voting share on the Toronto Stock Exchange over either 10 or 20 consecutive trading days prior to vesting, depending on the date issued |
Share based compensation expense | CAD |  |  |  |  |  |  |  | CAD 108,000,000 | 149,000,000
Total liability and intrinsic value for vested Units | CAD | CAD 185,000,000 |  |  |  |  |  |  | CAD 185,000,000 | CAD 128,000,000
Dilutive shares were not included in the diluted earnings per share | shares |  |  |  |  |  |  |  | 4,240,949 | 13,333,164
Dividends declared and paid per share | 0.45 | CAD 0.05 | CAD 0.10 |  | $ 0.05 | CAD 0.05 |  |  |
Top of range [member] | Performance share units (PSUs) [member] |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  | 200.00% | 200.00%
Bottom of range [member] | Performance share units (PSUs) [member] |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  | 0.00% | 0.00%
Class A Common Shares [member] |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
Number of vote per share | Vote / shares |  |  |  |  |  |  |  | 100 |
Class A share conversion | shares |  |  |  |  |  |  |  | (1,576,166) |
Percentage of voting equity interests |  |  | 57.70% | 62.20% |  |  |  |  |
Class B Subordinate Voting Shares [member] |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
Number of vote per share | Vote / shares |  |  |  |  |  |  |  | 1 |
Class A share conversion | shares |  |  |  |  |  |  |  | 1,576,166 |
Share option, granted | shares |  |  |  |  |  |  |  | 28,000,000 |
Share option, available for grant | shares |  |  |  |  |  |  |  | 4,800,000 |
Share option, granted |  |  |  |  |  |  |  | 2,010,520 |
Weighted average exercise price | CAD |  |  |  |  |  |  |  | CAD 27.79 |
Weighted average fair value of share option | CAD | CAD 8.32 |  |  |  |  |  |  | CAD 8.32 | CAD 1.81
Repurchase of voting shares under normal course issuer bid | shares | 5,890,794 |  |  |  |  |  |  |  |
Class B Subordinate Voting Shares [member] | Major ordinary share transactions [member] |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
Purchase of authorized shares under normal course issuer bid | shares |  |  |  |  |  |  | 20,000,000 |  |

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