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Share-Based Compensation - Summary of Activities Under Share-Based Compensation Plans (Parenthetical) (Detail) - shares | 12 Months Ended |
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Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of Shares, Expected to vest | 1,111,000 |
Market condition awards [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Outstanding SARs |  | 200,000
Exercised SARs | 200,000 |
Market condition awards [Member] | Maximum [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Outstanding SARs | 100,000 |
Exercisable SARs | 100,000 |
Performance condition SARs [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Outstanding SARs | 3,100,000 | 6,200,000
Exercised SARs | 3,000,000 |
Forfeited SARs | 100,000 |
Exercisable SARs | 1,800,000 |
Performance Based Stock Unit Awards [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of Shares, Expected to vest | 261,297 |
Performance Based Stock Unit Awards [Member] | Maximum [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of share based payment awards other than options outstanding and nonvested that can vest maximum | 708,836 | 268,776
Number of share based payment awards other than options that can vest maximum | 440,060 |

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- Definition Share based compensation arrangement by share based payment award equity instruments other than options maximum amount that can vest. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options outstanding and non-vested maximum amount that can vest. + References No definition available. + Details
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