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Stock-based Compensation Plans - Additional Information 1 (Detail) | 12 Months Ended
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Dec. 31, 2019 Award shares | Dec. 31, 2018 | Dec. 31, 2017
Restricted Stock Equity Awards |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Performance Share |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Number of awards available for grant | 3 |  |
Performance Share | Common Stock |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Number of share value each unit represents at grant date | shares | 1 |  |
Performance-based PG-PSUs and RG-PSUs |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Number of awards available for grant | 2 |  |
Performance-based PG-PSUs and RG-PSUs | Minimum |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Potential payout of shares granted | 0.00% |  |
Performance-based PG-PSUs and RG-PSUs | Maximum |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Potential payout of shares granted | 200.00% |  |
Performance Based TSR - PSUs |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Number of awards available for grant | 1 |  |
Performance Based TSR - PSUs | Minimum |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Potential payout of shares granted | 0.00% | 0.00% | 0.00%
Performance Based TSR - PSUs | Maximum |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Potential payout of shares granted | 200.00% | 200.00% | 150.00%

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- Definition Number of shares value each unit represents at grant date. + References No definition available. + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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