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Employee Compensation Plans - Stock Appreciation Rights (Detail) (USD $)	12 Months Ended
	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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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.

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- Definition

The strike price of each stock appreciation rights award outstanding.

+ References

No definition available.

+ Details

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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.

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- 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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