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Employee Compensation Plans - Stock Appreciation Rights (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Total Number of OARs outstanding | 1,855,995
Weighted average strike price | $ 25.05
Weighted average remaining contractual life | 2 years 1 month 6 days
Weighted average fair value per share | $ 3.16
January 10, 2008 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of OARs outstanding | 383,645
Strike price | $ 37.78
Remaining contractual life | 9 days
January 12, 2009 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of OARs outstanding | 358,930
Strike price | $ 12.74
Remaining contractual life | 1 year
Fair value per share | $ 5.83
January 19, 2010 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of OARs outstanding | 292,560
Strike price | $ 30.68
Remaining contractual life | 2 years
Fair value per share | $ 1.65
January 13, 2011 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of OARs outstanding | 392,630
Strike price | $ 26.35
Remaining contractual life | 3 years
Fair value per share | $ 2.12
January 19, 2012 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of OARs outstanding | 428,230
Strike price | $ 18.94
Remaining contractual life | 4 years
Fair value per share | $ 5.74

X
- Definition The fair value per share of each stock appreciation rights award outstanding by grant date as of the balance sheet date. + References No definition available. + Details
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Data Type: | num:perShareItemType
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X
- Definition The number of each stock appreciation rights award outstanding as of the balance sheet date. + References No definition available. + Details
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X
- Definition The remaining contractual term of the stock appreciation rights outstanding by grant date as of the balance sheet date. + References No definition available. + Details
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- Definition The strike price of each stock appreciation rights award outstanding. + References No definition available. + Details
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Data Type: | num:perShareItemType
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X
- Definition The total number of stock appreciation rights outstanding as of the balance sheet date. + References No definition available. + Details
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X
- Definition The weighted average fair value per share of the total stock appreciation rights outstanding as of the balance sheet date. + References No definition available. + Details
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X
- Definition The weighted average remaining contractual term of the total stock appreciation rights outstanding as of the balance sheet date. + References No definition available. + Details
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X
- Definition The weighted average strike price of the total stock appreciation rights outstanding as of the balance sheet date. + References No definition available. + Details
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X
- Details
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