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Employee Share Plans - Schedule of Restricted Stock Award Activity (Detail) - Restricted Stock Awards [Member] shares in Thousands	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Schedule Of Summary Of Restricted Stock Unit Activity [Line Items]
Outstanding Beginning balance, Number of Shares | shares	632
Granted, Number of Shares | shares	227
Vested, Number of Shares | shares	(282)
Outstanding Ending balance, Number of Shares | shares	577
Outstanding Beginning balance, Weighted Average Grant-Date Fair Value | $ / shares	$ 15.35
Granted, Weighted Average Grant-Date Fair Value | $ / shares	19.78
Vested, Weighted Average Grant-Date Fair Value | $ / shares	13.76
Outstanding Ending balance, Weighted Average Grant-Date Fair Value | $ / shares	$ 17.87

X

- Definition

Schedule Of Summary Of Restricted Stock Unit Activity [Line Items]

+ References

No definition available.

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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).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
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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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
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- 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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-Publisher FASB
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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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-Publisher FASB
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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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