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Summary of Restricted Share Units Granted (Detail) (Restricted Share Units, USD $)

9 Months Ended

Sep. 30, 2013

Restricted Share Units

Number of Restricted Share units

Outstanding number of Shares (Units), beginning balance

1,688,402

Granted, number of Shares (Units)

91,623

Vested, number of shares (Units)

(294,451)

^[1]

Forfeited, number of shares (Units)

(190,665)

Outstanding number of shares (Units), ending balance

1,294,909

Expected to vest, number of shares (Units)

1,165,351

^[2]

Weighted Average Grant Date Fair Value

Outstanding weighted average grant date fair value, beginning balance

$ 13.74

Granted, weighted average grant date fair value

$ 19.52

Vested, weighted average grant date fair value

$ 14.49

^[1]

Forfeited, weighted average grant date fair value

$ 13.62

Outstanding weighted Average Grant Date Fair Value, ending balance

$ 14.00

[1]	Vested RSUs have been net settled upon vesting by issuing 188,966 shares (net of minimum statutory withholding taxes).
[2]	RSUs expected to vest reflect an estimated forfeiture rate.

X

- Definition

As of the balance sheet date, the number of shares expected to be issued in future for awards (other than stock options) expected to vest.

+ References

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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

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-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=6415400&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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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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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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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

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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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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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