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Share-Based Compensation - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2013 Employee Stock Option [Member] | Sep. 30, 2013 Restricted Stock Shares [Member] | Jun. 30, 2013 Stock Appreciation Rights (SARs) [Member] | Sep. 30, 2013 Restricted Stock Units to be Settled in Cash [Member] | Sep. 30, 2013 Restricted Stock Units to be Settled in Cash [Member] | Sep. 30, 2013 Non-Employee Directors' Stock Options [Member] | Sep. 30, 2013 Non-Employee Directors' Stock Options [Member] Scenario One [Member] | Sep. 30, 2013 Non-Employee Directors' Stock Options [Member] Scenario Two [Member] | Sep. 30, 2013 2008 Incentive Compensation Plan [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock subject to awards of stock options or stock appreciation rights payable in shares |  |  |  |  |  |  |  |  |  |  | 1.0
Common stock subject to any other form of award |  |  |  |  |  |  |  |  |  |  | 1.67
Common stock available for future share-based awards |  |  |  |  |  |  |  |  |  |  | 10,200,000
Number of shares to reduce shares available to grant by upon vesting of restricted stock units | 4,600,000 | 4,600,000 |  |  |  |  |  |  |  |  |
Estimated pretax compensation expense | $ 8,000,000 | $ 8,000,000 |  |  |  |  |  |  |  |  |
Estimated pretax compensation expenses expiration, years |  | 4 years |  |  |  |  |  |  |  |  |
Employee stock options exercisable in percentage |  |  | 25.00% |  |  |  |  |  |  |  |
Service period in years |  | 4 years | 4 years | 4 years |  |  |  |  |  |  |
Expiration period in years |  |  | 10 years |  | 10 years |  |  | 10 years |  |  |
Vesting period in years |  |  |  |  |  |  |  |  | 3 | 4 |
Restricted stock awards exercisable in percentage |  |  |  | 25.00% |  |  |  |  |  |  |
Long-term incentive, cash-based awards |  | 3 years |  | 3 years | 4 years |  |  |  |  |  |
Restricted stock awards exercisable in percentage |  | 25.00% |  |  |  |  |  |  |  |  |
Fair value of outstanding cash settlement on RSU's |  |  |  |  |  | 6.8 | 6.8 |  |  |  |
Compensation-Stock Compensation and recognized a liability |  |  |  |  |  | 500,000 | 1,200,000 |  |  |  |
Grant date fair value of the performance unit awards granted during the first quarter |  | 2,500,000 |  |  |  |  |  |  |  |  |
Fair value of the liability incurred through | 100,000 | 300,000 |  |  |  |  |  |  |  |  |
SARs to be settled in cash granted |  |  |  |  | 200,000 |  |  |  |  |  |
Grant date fair value of SARs to be settled in cash |  |  |  |  | $ 200,000 |  |  |  |  |  |
SARs vesting rate |  |  |  |  | 25.00% |  |  |  |  |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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