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Share Based Compensation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock options granted (in shares) | 0.6 | 0.8
Shares granted (in shares) | 0.2 | 0.2
Period of payment of award | 3 years |
Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Payment of award, percentage | 0.00% |
Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Payment of award, percentage | 200.00% |
Target payout percentage | 100.00% |
Stock Option |  |
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 4 months 24 days |
Unvested Shares |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total unrecognized compensation cost | 13.4 |
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 |
Total unrecognized compensation cost | $ 1.9 |
Weighted-average period of total unrecognized compensation cost, in years | 1 year 2 months 12 days |

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- Definition Share Based Compensation Arrangement by Share Based Payment Award, Target Award + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Target Payout + 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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- 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 Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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 (a)(1) -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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- 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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