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Summary of Non-Vested Shares (Detail) - Common Stock Grants - $ / shares	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Beginning balance	759,285	772,718	587,210	628,231	632,660	391,753	587,210	391,753
Number of Shares, Granted	0	40,522	297,679	0	22,308	254,972
Number of Shares, Vested	(3,685)	(32,771)	(105,582)	(17,591)	(20,313)	(8,800)
Number of Shares, Forfeited	(8,595)	(21,184)	(6,589)	(13,659)	(6,424)	(5,265)
Number of Shares, Ending Balance	747,005	759,285	772,718	596,981	628,231	632,660	747,005	596,981
Weighted Average Grant-Date Fair Value, Beginning balance	$ 17.72	$ 17.77	$ 17.59	$ 17.40	$ 17.41	$ 15.61	$ 17.59	$ 15.61
Weighted Average Grant-Date Fair Value, Granted	0	13.34	17.34	0	23.66	19.97
Weighted Average Grant-Date Fair Value, Vested	17.84	13.35	15.21	13.51	22.82	12.07
Weighted Average Grant-Date Fair Value, Forfeited	17.89	17.77	17.69	17.35	17.25	16.51
Weighted Average Grant-Date Fair Value, Ending balance	$ 17.72	$ 17.72	$ 17.77	$ 17.51	$ 17.40	$ 17.41	$ 17.72	$ 17.51

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
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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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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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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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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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