Equity-Based Compensation - Summary of Key Assumptions Used for Fair Value Computation (Detail) - Performance Based Awards	12 Months Ended
Dec. 31, 2018
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Expected holding period	2 years 10 months 8 days
Risk–free rate of return (as a percent)	2.37%
Expected dividend yield (as a percent)	4.61%

Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]

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

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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