Stock-Based Compensation and Stock Awards - Schedule of Assumptions Used in Monte Carlo Simulation (Detail) - Performance Unit Awards - $ / shares	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility (as a percentage)	34.00%	32.50%
Risk-free interest rate (as a percentage)	1.70%	1.00%
Grant date price (in dollars per share)	$ 41.50	$ 48.45

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

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- Definition

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

+ References

No definition available.

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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=96867065&loc=d3e5070-113901

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- Definition

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.

+ References

No definition available.

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