Schedule Of Estimated Fair Value Of Option Grant Using Black-Scholes Option Pricing Model (Detail)
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12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Schedule of Weighted Average Fair Values of Stock Options [Line Items] | |||
Expected dividend yield | 3.00% | 0.00% | 0.00% |
Expected stock price volatility | 42.20% | 42.10% | 38.80% |
Risk-free interest rate | 1.00% | 2.10% | 2.40% |
Expected life of options | 5 years | 5 years | 5 years |
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- Details
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The range of expected volatilities used and the weighted-average expected volatility for an entity using a valuation technique with different volatilities during the contractual term. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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