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Assumptions Used to Estimate Fair Value of Stock Options and SARs Granted to Employees and Non-employees Directors (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2015 ExecutiveOfficers Employee	Sep. 30, 2014 Employee	Sep. 30, 2015 ExecutiveOfficers Employee	Sep. 30, 2014 ExecutiveOfficers Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Expected volatility, Minimum	35.00%	36.00%	33.00%	36.00%
Expected volatility, Maximum	49.00%	51.00%	49.00%	52.00%
Risk-free interest rate, Minimum	0.30%	0.10%	0.20%	0.10%
Risk-free interest rate, Maximum	2.40%	2.20%	2.40%	2.50%
Contractual term of up to	10 years	7 years	10 years	10 years
Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected forfeiture	10.00%	10.00%	10.00%	10.00%
Suboptimal exercise multiple	2.1	2.1	2.1	2.1
Executives
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected forfeiture	5.00%		5.00%	5.00%
Suboptimal exercise multiple | ExecutiveOfficers	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, Suboptimal Exercise Factor

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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

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.

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- Definition

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

+ References

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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