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Share Based Compensation - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended
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Feb. 29, 2016 | Jun. 30, 2016
Stock Option |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total unrecognized compensation cost |  | $ 14.3
Weighted-average period of total unrecognized compensation cost, in years |  | 1 year 6 months
Unvested Shares |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total unrecognized compensation cost |  | $ 10.4
Weighted-average period of total unrecognized compensation cost, in years |  | 1 year 1 month 6 days
Performance Shares Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock issued during period, shares | 87,600 |
Total unrecognized compensation cost |  | $ 10.1
Weighted-average period of total unrecognized compensation cost, in years |  | 1 year 1 month 6 days

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- 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 + Details
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