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Additional Information on Non Vested Restricted Stock (Detail) (Restricted Stock Awards, USD $) In Millions, unless otherwise specified	Dec. 31, 2013 Y
Restricted Stock Awards
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]
Aggregate intrinsic value	$ 35.5
Weighted-average remaining vesting period	1.94
Unrecognized compensation cost	$ 22.5

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- Definition

Share based Compensation Arrangement by Share based Payment Award, Equity Instruments Other than Options, Nonvested, Total Intrinsic Value

+ References

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- Definition

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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

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