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Summary of PSU Activity of the Incentive Plan (Parenthetical) (Detail) - Performance Share Units | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Number of shares granted based on target award performance period | 3 years |
Number of shares granted based on target award percentage |  | 150.00%
Minimum |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Number of shares granted based on target award percentage | 0.00% |
Maximum |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Number of shares granted based on target award percentage | 150.00% |

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- Definition Share based compensation arrangement, by share based payment award, number of shares granted based on target award percentage. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award number of shares granted based on target award performance period. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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