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Employee Share Plans - Roll Forward of RSU Activity (Detail) - Restricted Stock Awards [Member] shares in Thousands	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Schedule Of Summary Of Restricted Stock Unit Activity [Line Items]
Non-vested at December 31, 2017, Number of shares	724
Granted, Number of shares	272
Vested, Number of shares	(364)
Forfeited, Number of shares	0
Non-vested at December 31, 2018, Number of shares	632
Non-vested at December 31, 2017, Weighted Average Grant-Date Fair Value | $ / shares	$ 11.78
Granted, Weighted Average Grant-Date Fair Value | $ / shares	18.77
Vested, Weighted Average Grant-Date Fair Value | $ / shares	11.18
Non-vested at December 31, 2018, Weighted Average Grant-Date Fair Value | $ / shares	$ 15.35

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- Definition

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

+ References

No definition available.

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- 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=109197908&loc=d3e5070-113901

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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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-Publisher FASB
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-Topic 718
-SubTopic 10
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-Paragraph 2
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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
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-Paragraph 2
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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
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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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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- 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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