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Summary of SARs Activity of the Incentive Plan (Detail) - SARs - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of Shares
Number of Shares, beginning balance	195,000	250,000	337,000
Exercised	(186,000)	(55,000)	(84,000)
Forfeited			(3,000)
Number of Shares, ending balance	9,000	195,000	250,000
SARs exercisable	9,000	195,000	160,000
Weighted Average Exercise Price
Weighted average fair value, Balance at beginning of period	$ 9.35	$ 9.28	$ 9.15
Exercised	9.35	9.02	8.78
Forfeited			9.35
Weighted average fair value, Balance at end of period	$ 9.35	$ 9.35	$ 9.28

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options exercisable number.

+ References

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options exercised in period weighted average grant date fair value.

+ References

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(3)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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-Publisher FASB
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- Definition

Number of non-option equity instruments exercised by participants.

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-SubTopic 10
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-Paragraph 2
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