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Summary of Nonvested Shares (Detail) - Restricted and Unrestricted Stock - $ / shares	3 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Beginning balance	492,523	495,534	719,845	759,285	772,718	587,210
Number of Shares, Granted		43,168	4,185		40,522	297,679
Number of Shares, Vested		(37,958)	(213,781)	(3,685)	(32,771)	(105,582)
Number of Shares, Forfeited	(8,430)	(8,221)	(14,715)	(8,595)	(21,184)	(6,589)
Number of Shares, Ending Balance	484,093	492,523	495,534	747,005	759,285	772,718
Weighted Average Grant-Date Fair Value, Beginning balance	$ 18.22	$ 18.31	$ 17.67	$ 17.72	$ 17.77	$ 17.59
Weighted Average Grant-Date Fair Value, Granted		13.45	18.63		13.34	17.34
Weighted Average Grant-Date Fair Value, Vested		13.88	16.18	17.84	13.35	15.21
Weighted Average Grant-Date Fair Value, Forfeited	18.54	18.64	18.08	17.89	17.77	17.69
Weighted Average Grant-Date Fair Value, Ending balance	$ 18.22	$ 18.22	$ 18.31	$ 17.72	$ 17.72	$ 17.77

X

- Definition

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

+ 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
-Subparagraph (c)(1)(iv)(3)
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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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X

- 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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- Definition

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

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- Definition

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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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