Stock-Based Compensation and Stock Awards - Schedule of Assumptions Used in Monte Carlo Simulation (Detail) (Performance Unit Awards [Member], USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Performance Unit Awards [Member]
Share Based Compensation Shares Authorized Under Award Type [Line Items]
Grant date	Oct. 28, 2014	Oct. 28, 2013
Performance period	October 1, 2014 to September 30, 2017	October 1, 2013 to September 30, 2016
Volatility	27.80%	34.40%
Risk-free interest rate	0.8081%	0.569%
Grant date price	$ 91.02	$ 116.83

Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Date Of Grant

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Grant Date Stock Price

+ References

No definition available.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Performance Period

+ References

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- Definition

Share based compensation arrangement by share based payment award fair value assumptions performance shares risk free interest rate.

+ References

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- Definition

The estimated measure of the 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

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)(ii)

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

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