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Assumptions Used to Estimate Fair Value of Stock Options Granted, SARs Granted and Employee Share Purchase Plan Granted to Employees (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Stock options and SARs, Expected volatility, Minimum	39.00%	47.00%	38.00%	47.00%
Stock options and SARs, Expected volatility, Maximum	53.00%	55.00%	54.00%	58.00%
Risk-free interest rate, Minimum	0.10%	0.20%	0.10%	0.10%
Risk-free interest rate, Maximum	2.00%	1.00%	2.50%	1.20%
Expected forfeiture	10.00%	10.00%	10.00%	10.00%
Expected forfeiture (executives)		5.00%	5.00%	5.00%
Contractual term of up to	7 years	7 years	10 years	10 years
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Stock options and SARs, Expected volatility, Minimum	34.00%	47.00%	34.00%	41.00%
Stock options and SARs, Expected volatility, Maximum	52.00%	55.00%	53.00%	61.00%
Risk-free interest rate, Minimum	0.10%	0.20%	0.10%	0.10%
Risk-free interest rate, Maximum	0.20%	1.00%	0.20%	0.60%
Expected forfeiture	0.00%	0.00%	0.00%	0.00%
Contractual term of up to	24 months	24 months	24 months	24 months
Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Suboptimal exercise multiple	2.1	2.1	2.1	2.1
Executives
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Suboptimal exercise multiple		2.4	2.4	2.4

X

- Definition

Share based compensation arrangement by share based payment award fair value assumptions, expected forfeiture.

+ References

No definition available.

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- Definition

Share based compensation arrangement by share based payment award fair value assumptions expected forfeiture for executives.

+ References

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Suboptimal Exercise Factor

+ References

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ 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 (f)(2)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Expected term of share-based compensation awards, 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 S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.D.2)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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- Definition

The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

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- Definition

The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

No definition available.

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- Definition

The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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