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Stock-Based Compensation - Assumptions Used to Determine the Fair Value of the Awards with Market-Based (Detail) (USD $) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested [Roll Forward] |  |  |  |
Expected dividends per share | $ 0.90 | $ 0.80 | $ 0.90 | $ 0.80
Expected volatility, minimum | 41.50% | 36.70% | 41.50% | 36.70%
Expected volatility, maximum | 51.60% | 50.00% | 51.60% | 50.00%
Risk-free interest rate, minimum | 0.00% | 0.10% | 0.00% | 0.10%
Risk-free interest rate, maximum | 2.00% | 1.20% | 2.00% | 1.20%
Estimated cost of capital | 9.30% |  | 9.30% |
Estimated cost of capital, minimum |  | 11.90% |  | 11.90%
Estimated cost of capital, maximum |  | 12.10% |  | 12.10%
Expected life (in years) | 6 years | 6 years | 6 years | 6 years

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- Definition Share based compensation arrangement by share based payment award fair value assumptions estimated cost of capital. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award fair value assumptions estimated cost of capital, maximum. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award fair value assumptions estimated cost of capital, minimum. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award fair value assumptions expected dividend per share. + References No definition available. + Details
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- Details
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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 + Details
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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. + References No definition available. + Details
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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 No definition available. + Details
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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. + Details
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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