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Legal and Insurance Matters - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
0 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 0 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 05, 2013
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Dec. 31, 2013
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Dec. 31, 2013
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Jan. 07, 2014
Subsequent Event
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Mar. 04, 2014
Subsequent Event
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Mar. 31, 2013
2010 Derivative Action
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Dec. 31, 2013
2010 Derivative Action
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Dec. 31, 2013
2010 Class Action
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Sep. 30, 2013
2010 Class Action
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Oct. 07, 2013
2013 Shareholder Derivative Actions
LegalMatter
Defendant
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Dec. 31, 2013
2013 Shareholder Derivative Actions
LegalMatter
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Dec. 31, 2013
2013 Shareholder Class Actions
LegalMatter
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| Commitments and Contingencies Disclosure [Line Items] | ||||||||||||
| Compensatory damages awarded | $ 281.6 | $ 163.8 | ||||||||||
| Surety Bonds | 25.0 | 25.0 | ||||||||||
| Available insurance limit | 16.0 | 16.0 | ||||||||||
| Reservation rights | 9.0 | |||||||||||
| Payment to Plaintiff's attorneys | 13.5 | 0.3 | ||||||||||
| Issuance of shares to Plaintiffs attorneys | 0.1 | |||||||||||
| Litigation expense | 7.0 | 2.4 | 1.6 | 7.0 | 16.0 | |||||||
| Accrual for settlement offer | 16.0 | |||||||||||
| Stock to be issued for legal settlement, shares | 0.8 | |||||||||||
| Stock to be issued for legal settlement, value | 13.5 | |||||||||||
| Total value of settlement | $ 27.0 | |||||||||||
| Number of identical shareholder derivative lawsuits asserted | 2 | 3 | 2 | |||||||||
| Number of officers and directors in lawsuit | 10 | |||||||||||