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Additional Information with Respect to Non-vested Shares (Detail) (Employee Stock Option, USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 Y
Employee Stock Option |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Aggregate intrinsic value | $ 5
Weighted-average remaining contractual term | 8.90
Weighted-average remaining expected term | 3.90
Weighted-average remaining vesting period | 1 year 9 months 22 days
Unrecognized compensation cost | $ 6.3

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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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