Stock-Based Incentive Plan - Aggregated Assumptions Used to Estimate Fair Value of Options Granted (Detail)	12 Months Ended
Dec. 31, 2018 $ / shares
Share-based Payment Arrangement [Abstract]
Expected option life in years - weighted average	6 years 7 months 6 days
Risk free interest rate - weighted average	2.80%
Expected dividend yield - weighted average	2.81%
Expected volatility - weighted average	27.15%
Fair value of options	$ 6.46

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- Definition

Rate of weighted-average expected volatility for award under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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=120381028&loc=d3e5070-113901

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

The weighted average 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.

+ References

No definition available.

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- Definition

The weighted average expected term of share-based compensation awards.

+ References

No definition available.

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- Definition

The weighted average 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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