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Stock-Based Compensation (Detail) - (Table 4) - $ / shares	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%	0.00%
Weighted average fair value	$ 8.70	$ 10.10
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	22.40%	29.00%
Risk free interest rate	0.99%	1.06%
Expected life in years	4 years 1 month	4 years 1 month
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	28.30%	31.80%
Risk free interest rate	1.60%	1.74%
Expected life in years	5 years 1 month	5 years 1 month

X

- Definition

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 820



-SubTopic 10



-Section 50



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Risk-free interest rate assumption used in valuing an instrument.

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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.

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



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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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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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