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Accounting for Stock- Based Compensation - Additional Information (Detail) (USD $)	6 Months Ended	1 Months Ended					1 Months Ended
	Jun. 30, 2013	May 23, 2013 Performance Based Restricted Stock Units	Mar. 07, 2013 Performance Based Restricted Stock Units	Jun. 30, 2013 Stock Options	Jun. 30, 2013 Restricted Stock Units (RSUs)	Jun. 30, 2013 Performance Options	May 23, 2013 Performance Based Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted		1,687,900	5,846,000				5,598,100
Weighted average grant date fair value of the stock options granted		$ 6.85	$ 2.81				$ 3.05
Unrecognized compensation cost related to non-vested stock options				$ 24,300,000	$ 31,500,000
Weighted average vesting period for unrecognized compensation cost	9 months 18 days
Unrecognized expenses milestones not considered probable of achievement					$ 3,700,000	$ 107,000

X

- Definition

Employee service share based compensation nonvested awards aggregate compensation cost not yet recognized not considered probable of achievement.

+ References

No definition available.

+ Details

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X

- Definition

Unrecognized cost of unvested share-based compensation awards.

+ 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 (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ 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 (d)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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