Employee Share Plans - Stock Award Activity (Detail) shares in Thousands	3 Months Ended
Mar. 31, 2019 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding Beginning balance, Number of Options \| shares	3,622
Exercised / Vested, Number of Options \| shares	(189)
Outstanding Ending balance, Number of Options \| shares	3,433
Exercisable Ending balance, Number of Options \| shares	1,882
Outstanding Beginning balance, Weighted Average Exercise Price Per Share \| $ / shares	$ 11.97
Exercised / Vested, Weighted Average Exercise Price Per Share \| $ / shares	7.40
Outstanding Ending balance, Weighted Average Exercise Price Per Share \| $ / shares	12.22
Exercisable Ending balance, Weighted Average Exercise Price \| $ / shares	$ 9.40
Restricted Stock Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding Beginning balance, Number of Shares \| shares	632
Granted, Number of Shares \| shares	173
Exercised / Vested, Number of Shares \| shares	(63)
Outstanding Ending balance, Number of Shares \| shares	742
Outstanding Beginning balance, Weighted Average Grant-Date Fair Value \| $ / shares	$ 15.35
Granted, Weighted Average Grant-Date Fair Value \| $ / shares	19.82
Exercised / Vested, Weighted Average Grant-Date Fair Value \| $ / shares	14.31
Outstanding Ending balance, Weighted Average Grant-Date Fair Value \| $ / shares	$ 16.48

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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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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- Definition

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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- 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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No definition available.

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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- Definition

Number of options outstanding, including both vested and non-vested options.

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

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No definition available.

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- Definition

Number of share options (or share units) exercised during the current period.

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