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Summary of Performance-based Award Activity (Detail) - Performance Shares - USD ($)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Number of shares
Beginning balance	[1]	228,892	145,962	66,150
Grants	[1]	182,300	87,000	82,000
Vested	[1]	(58,888)
Cancellations	[1]	(13,017)	(4,070)	(2,188)
Ending balance	[1]	339,287	228,892	145,962
Total unrecognized compensation expense remaining	[1]	$ 2,388,000
Weighted-average grant date fair value
Beginning balance		$ 16.49	$ 15.32	$ 14.84
Grants		12.81	18.45	15.69
Vested		14.84
Cancellations		15.95	16.52	14.94
Ending balance		$ 14.82	$ 16.49	$ 15.32
Weighted-average years expected to be recognized over	[1]	1 year 8 months 12 days
[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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- Definition

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 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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- Definition

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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- 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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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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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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