Stockholders' Equity - Estimated Amount of Total Share-based Compensation Expense (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013
2013	$ 8.4
2014	16.6
2015	11.2
2016	3.4
Total	$ 39.6

Employee service share based compensation non vested awards compensation cost to be recognized in year four.

No definition available.

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- Definition

Employee service share-based compensation non-vested awards compensation cost to be recognized in year one.

+ References

No definition available.

+ Details

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- Definition

Employee service share-based compensation non-vested awards compensation cost to be recognized in year three.

+ References

No definition available.

+ Details

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- Definition

Employee service share-based compensation non-vested awards compensation cost to be recognized in year two.

+ References

No definition available.

+ Details

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- 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

+ Details

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