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Accrued Liabilities - Additional Information (Detail) (2010 Class Action Litigation, USD $)
In Millions, unless otherwise specified |
12 Months Ended |
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Dec. 31, 2013
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2010 Class Action Litigation
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| Schedule of Accrued Liabilities [Line Items] | |
| Accrued legal and environmental | $ 27.0 |
| Amount to be settled through the issuance of common stock | $ 13.5 |