Quarterly report pursuant to Section 13 or 15(d)

Income Tax Benefit (Expense) - Additional Information (Detail)

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Income Tax Benefit (Expense) - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Schedule Of Income Taxes [Line Items]  
Income tax (benefit) expense due to election of another acceptable tax method $ (11.1)