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Summary of Restricted Common Share Awards and RSU of Incentive Plan (Detail) - Restricted Stock and RSUs - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Number of Shares
Number of Shares, beginning balance	326,541	303,819	295,847
Common Share awards, granted	282,735	213,744	233,706
Common Share awards, vested	(164,026)	(174,367)	(175,555)
Common Share awards, forfeited	(38,401)	(16,655)	(50,179)
Number of Shares, ending balance	406,849	326,541	303,819
Weighted Average Grant Date Fair Value Per Share
Weighted average fair value, Balance at beginning of period	$ 9.54	$ 8.22	$ 7.84
Weighted average fair value, granted	12.85	10.39	8.64
Weighted average fair value, vested	9.32	9.27	7.99
Weighted average fair value, forfeited	12.20	9.75	8.45
Weighted average fair value, Balance at end of period	$ 11.68	$ 9.54	$ 8.22

X

- 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)
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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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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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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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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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