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Employee Share Plans - Stock Award Activity (Detail) shares in Thousands	9 Months Ended
	Sep. 30, 2017 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding Beginning balance, Number of Options | shares	4,376
Granted, Number of Options | shares	654
Exercised or released, Number of options | shares	(889)
Expired or canceled, Number of Options | shares	(8)
Outstanding Ending balance, Number of Options | shares	4,133
Exercisable Ending balance, Number of Options | shares	2,292
Outstanding Beginning balance, Weighted Average Exercise Price Per Share | $ / shares	$ 8.02
Granted, Weighted Average Exercise Price Per Share | $ / shares	15.54
Exercised or released, Weighted Average Exercise Price Per Share | $ / shares	7.01
Expired or canceled, Weighted Average Exercise Price Per Share | $ / shares	7.71
Outstanding Ending balance, Weighted Average Exercise Price Per Share | $ / shares	9.43
Exercisable Ending balance, Weighted Average Exercise Price | $ / shares	$ 7.64
Restricted Stock Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding Beginning balance, Number of shares | shares	827
Granted, Number of shares | shares	295
Exercised or released, Number of shares | shares	(395)
Expired or canceled, Number of Shares | shares	(3)
Outstanding Ending balance, Number of shares | shares	724
Outstanding Beginning balance, Weighted Average Grant-Date Fair Value | $ / shares	$ 9.14
Granted, Weighted Average Grant-Date Fair Value | $ / shares	14.90
Exercised or released, Weighted Average Grant Date Fair Value | $ / shares	8.61
Expired or Canceled, Weighted Average Grant-Date Fair Value | $ / shares	8.36
Outstanding Ending balance, Weighted Average Grant-Date Fair Value | $ / shares	$ 11.78

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://www.xbrl.org/2003/role/presentationRef
-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=96867065&loc=d3e5070-113901

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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
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(3)
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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).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (c)(2)(iii)(1)
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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).

+ References

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-Publisher FASB
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-Subparagraph (c)(2)(iii)(1)
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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Subparagraph (c)(2)(i)-(ii)
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X

- 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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-Publisher FASB
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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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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.

+ References

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-Publisher FASB
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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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No definition available.

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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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-Publisher FASB
-Name Accounting Standards Codification
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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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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-Publisher FASB
-Name Accounting Standards Codification
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Gross number of share options (or share units) granted during the period.

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No definition available.

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

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

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

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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No definition available.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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

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-Name Accounting Standards Codification
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