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Summary of Performance-based Award Activity (Detail) - Performance Shares $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($) $ / shares shares
Number of shares
Beginning balance | shares	228,892	[1]
Grants | shares	182,175	[1]
Vested | shares	(58,888)	[1]
Cancellations | shares	(8,397)	[1]
Ending balance | shares	343,782	[1]
Total unrecognized compensation expense remaining | $	$ 3,012	[1]
Weighted-average years expected to be recognized over	1 year 10 months 25 days	[1]
Weighted-average grant date fair value
Beginning balance | $ / shares	$ 16.49
Grants | $ / shares	12.81
Vested | $ / shares	14.84
Cancellations | $ / shares	16.13
Ending balance | $ / shares	$ 14.83
[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.

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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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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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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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