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Accounting for Stock- Based Compensation - Additional Information (Detail) (USD $) | 6 Months Ended | 1 Months Ended |  | 1 Months Ended
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Jun. 30, 2013 | May 23, 2013 Performance Based Restricted Stock Units | Mar. 07, 2013 Performance Based Restricted Stock Units | Jun. 30, 2013 Stock Options | Jun. 30, 2013 Restricted Stock Units (RSUs) | Jun. 30, 2013 Performance Options | May 23, 2013 Performance Based Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Options granted |  | 1,687,900 | 5,846,000 |  |  |  | 5,598,100
Weighted average grant date fair value of the stock options granted |  | $ 6.85 | $ 2.81 |  |  |  | $ 3.05
Unrecognized compensation cost related to non-vested stock options |  |  |  | $ 24,300,000 | $ 31,500,000 |  |
Weighted average vesting period for unrecognized compensation cost | 9 months 18 days |  |  |  |  |  |
Unrecognized expenses milestones not considered probable of achievement |  |  |  |  | $ 3,700,000 | $ 107,000 |

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- Definition Employee service share based compensation nonvested awards aggregate compensation cost not yet recognized not considered probable of achievement. + 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 Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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