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Share Based Compensation (Additional Information) (Detail) - USD ($) shares in Millions, $ in Millions | 6 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014
Stock Option |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock options granted (in shares) | 0.4 | 0.5
Total unrecognized compensation cost | $ 13.5 |
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] |  |
Shares granted (in shares) | 0.1 | 0.2
Total unrecognized compensation cost | $ 11.7 |
Weighted-average period of total unrecognized compensation cost, in years | 1 year 1 month 6 days |
Performance Shares |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares granted (in shares) | 0.1 | 0.1
Total unrecognized compensation cost | $ 8.7 |
Weighted-average period of total unrecognized compensation cost, in years | 1 year 1 month 6 days |

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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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- 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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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Net number of share options (or share units) granted during the period. + 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 (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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