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Summary of Shares Outstanding Under Share Based Incentive Plans (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) shares Stock_Unit Year $ / shares | Dec. 31, 2016 USD ($) shares Stock_Unit $ / shares | Dec. 31, 2015 $ / shares
Equity-Settled Plans [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Ending balance | shares | 195,743 |  |
Restricted Share Units (RSUs) [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Beginning balance | 3,129,039 | 2,896,818 |
Granted | 1,343,669 | 1,911,200 |
Redeemed | (1,404,271) | (1,311,580) |
Forfeitures | (271,579) | (367,399) |
Ending balance | 2,796,858 | 3,129,039 |
Performance Share Units (PSUs) [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Beginning balance | 6,493,798 | 4,898,455 |
Granted | 828,400 | 3,443,600 |
Redeemed | (1,325,692) | (1,136,720) |
Forfeitures | (270,247) | (711,537) |
Ending balance | 5,726,259 | 6,493,798 |
Share Appreciation Rights [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Beginning balance | 253,376 | 343,132 |
Forfeitures | (117,207) | (89,756) |
Ending balance | 136,169 | 253,376 |
Weighted Average Exercise Price, Beginning balance | $ | $ 15.47 | $ 15.93 |
Weighted Average Exercise Price, Forfeited | $ | 15.75 | 17.22 |
Weighted Average Exercise Price, Ending balance | $ | $ 15.22 | $ 15.47 |
Exercisable, Beginning balance | shares | 253,376 | 343,132 |
Exercisable, Ending balance | shares | 136,169 | 253,376 |
Share Appreciation Rights [Member] | 15.22 - 15.79 Range of Exercise Prices [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Number | shares | 136,169 |  |
Weighted average exercise price | $ | $ 15.22 |  |
Weighted average remaining contractual life | Year | 0.16 |  |
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 | $ 15.22
Range of Exercise Price, Forfeited | $ / shares | 15.22 | 15.22 |
Share Appreciation Rights [Member] | Bottom of Range [Member] | 15.22 - 15.79 Range of Exercise Prices [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Range of Exercise Price | $ / shares | 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 | $ 17.38
Range of Exercise Price, Forfeited | $ / shares | 17.38 | $ 13.26 |
Share Appreciation Rights [Member] | Top of Range [Member] | 15.22 - 15.79 Range of Exercise Prices [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Range of Exercise Price | $ / shares | $ 15.79 |  |
Deferred Share Units (DSUs) [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Beginning balance | shares | 621,821 | 428,028 |
Granted | shares | 331,456 | 193,793 |
Ending balance | shares | 953,277 | 621,821 |
Executive Performance Share Units [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Granted | shares | 1,159,000 |  |
Ending balance | shares | 1,159,000 |  |
Weighted Average Exercise Price, Ending balance | $ | $ 6.00 |  |
Weighted Fair Value, Granted | $ | $ 6.00 |  |

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