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Share-Based Compensation - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2013
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |
Number of shares to reduce shares available to grant by upon vesting of restricted stock units | 4,500,000 | 4,500,000
Estimated pretax compensation expense | $ 9,000,000 | $ 9,000,000
Estimated pretax compensation expenses expiration, years |  | 4 years
Service period in years |  | 4 years
Long-term incentive, cash-based awards |  | 3 years
Restricted stock awards exercisable in percentage |  | 25.00%
Grant date fair value of the performance unit awards granted during the first quarter |  | 3,800,000
Fair value of the liability incurred through | 100,000 | 200,000
Restricted Stock Units to be Settled in Cash [Member] |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |
Fair value of outstanding cash settlement on RSU's | 7.7 | 7.7
Compensation-Stock Compensation and recognized a liability | 600,000 | 700,000
Stock Appreciation Rights (SARs) [Member] |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |
Expiration period in years | 10 years |
Long-term incentive, cash-based awards | 4 years |
SARs to be settled in cash granted | 200,000 | 200,000
Grant date fair value of SARs to be settled in cash | $ 200,000 | $ 200,000
SARs vesting rate | 25.00% |
Employee Stock Option [Member] |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |
Employee stock options exercisable in percentage |  | 25.00%
Service period in years |  | 4 years
Expiration period in years |  | 10 years
Non-Employee Directors' Stock Options [Member] |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |
Expiration period in years |  | 10 years
Non-Employee Directors' Stock Options [Member] | Scenario One [Member] |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |
Vesting period in years |  | 3
Non-Employee Directors' Stock Options [Member] | Scenario Two [Member] |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |
Vesting period in years |  | 4
Restricted Stock Shares [Member] |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |
Service period in years |  | 4 years
Restricted stock awards exercisable in percentage |  | 25.00%
Long-term incentive, cash-based awards |  | 3 years
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 | 10,200,000

X
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- Definition Fair value of outstanding share-based awards to be settled in cash as of the period end date. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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=6415400&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=6415400&loc=d3e5070-113901 + Details
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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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