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Stock-based Compensation Plans - Additional Information (Detail) - Plans | 9 Months Ended | 12 Months Ended
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Sep. 30, 2017 | Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Active equity-based stock plans | 1 |
Stock Appreciation Rights (SARs) |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Vesting period | 3 years |
Stock Appreciation Rights (SARs) | Maximum |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Expiration term of stock units | 5 years |
Restricted Stock |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Vesting period | 3 years |
Market-based TSR |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Vesting period | 3 years | 3 years
Market-based TSR | Maximum |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Potential payout of shares granted | 150.00% |
Potential payout of shares granted on negative return | 100.00% |
Market-based TSR | Minimum |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Potential payout of shares granted | 0.00% |
Performance-based PGPS/RGPS |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Vesting period | 3 years |
Performance-based PGPS/RGPS | Maximum |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Potential payout of shares granted | 150.00% |
Performance-based PGPS/RGPS | Minimum |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Potential payout of shares granted | 0.00% |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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