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Stock-based Compensation Plans - Additional Information 1 (Detail) | 12 Months Ended |
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Dec. 31, 2018 Award shares | Dec. 31, 2017 shares | Dec. 31, 2016 shares | Dec. 31, 2015 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Vesting period | 1 year |  |  |
Restricted Stock Equity Awards |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Vesting period | 3 years | 3 years | 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% | 150.00% | 150.00% |
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 | 1,003,600 | 1,510,977

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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=109197908&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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