Stock-Based Compensation - Summary of Assumptions Used in Options (Detail)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock Based Compensation [Line Items]
Weighted average volatility	20.89%	23.56%	23.99%
Minimum
Stock Based Compensation [Line Items]
Expected life (years)	4 years 6 months	4 years 6 months	3 years
Risk-free interest rate	1.19%	1.27%	0.87%
Expected dividend yield	2.29%	2.18%	1.77%
Expected volatility	20.02%	23.44%	23.50%
Maximum
Stock Based Compensation [Line Items]
Expected life (years)	5 years 3 months	5 years 3 months	5 years 3 months
Risk-free interest rate	1.92%	1.58%	1.66%
Expected dividend yield	2.90%	2.45%	2.39%
Expected volatility	23.44%	23.70%	25.32%

Stock based compensation.

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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.

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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.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Weighted average expected volatility rate of share-based compensation awards.

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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 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: 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

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