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Stock-based Compensation Plans - Additional Information 3 (Detail) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Vesting period |  | 1 year |  |
Accelerated vesting of equity grants | $ 30,800,000 |  | $ 30,800,000 |
Unrecognized compensation related to Awards |  | $ 427,000 |  |
Weighted average period |  | 1 year 8 months 12 days |  |
Performance-based PG-PSUs and RG-PSUs |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Vesting period |  | 3 years |  |
Stock-based compensation expense |  | $ 5,400,000 | 1,800,000 |
Accelerated vesting of equity grants |  |  | 1,500,000 |
Performance Based TSR - PSUs |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Vesting period |  | 3 years |  |
Stock-based compensation expense |  | $ 6,300,000 | 24,800,000 | $ 12,400,000
Accelerated vesting of equity grants |  |  | $ 13,000,000 |
Performance Share |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Vesting period |  | 3 years |  |
Unrecognized compensation related to Awards |  | $ 1,100,000 |  |
Weighted average period |  | 1 year 6 months |  |
Stock Appreciation Rights (SARs) |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense |  | $ 0 |  |
Number of awards exercised | shares |  | 0 | 0 | 0
Outstanding awards exercisable, exercise price | $ / shares |  | 81.74 |  |
Outstanding awards exercisable, aggregate intrinsic value |  | $ 0 |  |
Stock Appreciation Rights (SARs) | Maximum |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Outstanding awards exercisable, weighted average remaining contractual life |  | 1 year |  |

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- Definition Share-based compensation arrangement by share-based payment award, options, outstanding and exercisable, weighted average exercise price. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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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