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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Discrete Tax Adjustments
Income Tax [Line Items]      
Discrete adjustments to income tax provision     $ 6.9
Valuation allowances $ 9.6 $ 10.2