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Summary of Performance-based Award Activity (Detail) - Performance Shares	3 Months Ended
	Mar. 31, 2019 USD ($) $ / shares shares
Number of shares
Beginning balance | shares	339,287	[1]
Vested | shares	(66,761)	[1]
Cancellations | shares	(22,517)	[1]
Ending balance | shares	250,009	[1]
Total unrecognized compensation expense remaining | $	$ 1,956,000	[1]
Weighted-average years expected to be recognized over	1 year 6 months	[1]
Weighted-average grant date fair value
Beginning balance | $ / shares	$ 14.82
Vested | $ / shares	15.69
Cancellations | $ / shares	15.75
Ending balance | $ / shares	$ 14.50
[1] Represents the target number of shares to be issued for each performance-based award.

X

- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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-Publisher FASB
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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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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.

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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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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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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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