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Summary of Shares Outstanding Under Share Based Incentive Plans (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) shares Stock_Unit $ / shares | Dec. 31, 2017 USD ($) shares Stock_Unit $ / shares | Dec. 31, 2016 $ / shares
Equity-Settled Plans [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Beginning balance | 195,743 |  |
Redeemed | (102,570) |  |
Ending balance | 93,173 | 195,743 |
Restricted Share Units (RSUs) [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Beginning balance | Stock_Unit | 2,796,858 | 3,129,039 |
Granted | Stock_Unit | 2,918,912 | 1,343,669 |
Redeemed | Stock_Unit | (1,404,284) | (1,404,271) |
Forfeited | Stock_Unit | 255,572 | (271,579) |
Ending balance | Stock_Unit | 4,055,914 | 2,796,858 |
Performance Share Units (PSUs) [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Beginning balance | Stock_Unit | 5,726,259 | 6,493,798 |
Granted | Stock_Unit | 1,292,550 | 828,400 |
Redeemed | Stock_Unit | (2,137,163) | (1,325,692) |
Forfeited | Stock_Unit | 338,656 | (270,247) |
Ending balance | Stock_Unit | 4,542,990 | 5,726,259 |
Share Appreciation Rights [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Beginning balance | Stock_Unit | 136,169 | 253,376 |
Forfeited | Stock_Unit | (136,169) | (117,207) |
Ending balance | 0 | 136,169 |
Weighted Average Exercise Price, Beginning balance | $ | $ 15.22 | $ 15.47 |
Weighted Average Exercise Price, Forfeited | $ |  | 15.75 |
Weighted Average Exercise Price, Ending balance | $ |  | $ 15.22 |
Exercisable, Beginning balance | 136,169 | 253,376 |
Exercisable, Ending balance |  | 136,169 |
Share Appreciation Rights [Member] | Bottom Of Range [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Range of Exercise Price | $ / shares |  | $ 15.22 | $ 15.22
Range of Exercise Price, Forfeited | $ / shares | $ 15.22 | 15.22 |
Share Appreciation Rights [Member] | Top of Range [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Range of Exercise Price | $ / shares |  | 15.22 | $ 15.79
Range of Exercise Price, Forfeited | $ / shares | $ 15.22 | $ 17.38 |
Deferred Share Units (DSUs) [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Beginning balance | 953,277 | 621,821 |
Granted | 474,766 | 331,456 |
Redeemed | (374,408) |  |
Ending balance | 1,053,635 | 953,277 |
Executive Performance Share Units [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Beginning balance | 1,159,000 |  |
Granted | 2,082,800 | 1,159,000 |
Forfeited | (50,733) |  |
Ending balance | 3,191,067 | 1,159,000 |
Weighted Average Exercise Price, Beginning balance | $ | $ 6.00 |  |
Weighted Average Exercise Price, Forfeited | $ | 6.12 |  |
Weighted Average Exercise Price, Ending balance | $ | 6.14 | $ 6.00 |
Weighted Fair Value, Granted | $ | $ 6.22 | $ 6.00 |

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