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Stock Based Compensation - Information with Respect to Unvested Restricted Stock Awards Stock Option and Incentive Plan (Detail) - Restricted Stock [Member] - $ / 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]
Beginning balance, shares	438,226	403,372	396,760	430,400	646,365	632,296
Granted, Number of Restricted Stock Awards	2,680	145,000	45,000	7,244	133,160	40,000
Vested, Number of Restricted Stock Awards	(625)	(104,926)	(31,250)		(84,914)	(21,250)
Forfeited, Number of Restricted Stock Awards	(2,369)	(5,220)	(7,138)	(2,351)	(264,211)	(4,681)
Ending balance, shares	437,912	438,226	403,372	435,293	430,400	646,365
Nonvested, Weighted-Average Grant Date Fair Value, Beginning balance	$ 43.48	$ 42.12	$ 41.71	$ 41.06	$ 34.03	$ 33.33
Granted, Weighted-Average Grant Date Fair Value	54.36	45.59	44.97	41.76	41.30	47.94
Vested, Weighted-Average Grant Date Fair Value	41.02	41.16	40.97		41.58	37.69
Forfeited, Weighted-Average Grant Date Fair Value	45.60	43.75	42.60	41.97	23.81	42.79
Nonvested, Weighted-Average Grant Date Fair Value, Ending balance	$ 43.54	$ 43.48	$ 42.12	$ 41.07	$ 41.06	$ 34.03

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)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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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.

+ References

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-Publisher FASB
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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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X

- 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).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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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.

+ References

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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.

+ References

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-Publisher FASB
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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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- Definition

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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