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Stock-based Compensation Plans - Additional Information 1 (Detail) | 9 Months Ended |
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Sep. 30, 2018 Award shares | Dec. 31, 2017 shares
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] |  |
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 granted represents | 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% |
Performance Based TSR - PSUs | Maximum |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Potential payout of shares granted | 200.00% |
Stock Appreciation Rights (SARs) |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Number of stock option outstanding | shares | 1,104 | 382,779

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