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Share-Based Compensation - Summary of Activity Under Share-Based Compensation Plans (Parenthetical) (Detail) - shares | Jun. 30, 2020 | Dec. 31, 2019
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of Shares, Expected to vest | 2,822,000 |
Market condition awards [Member] | Maximum [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Outstanding SARs | 100,000 | 100,000
Exercisable SARs | 100,000 |
Performance condition SARs [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Outstanding SARs | 2,100,000 | 2,900,000
Exercisable SARs | 2,100,000 |
Performance Based Stock Unit Awards [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares, granted during period | 504,908 |
Number of Shares, Expected to vest |  | 506,200
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 | 980,338 | 475,430

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- Definition Share based compensation arrangement by share based payment award equity instruments other than options expected to vest number. + 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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- Definition The number of exercisable stock appreciation rights (SARs). + References No definition available. + Details
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