Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Income Taxes [Line Items]  
Operating loss carry forward period 20 years
Operating loss carry back period 2 years
Federal net operating loss expected to be utilized in year 2012 $ 17.6
Federal net operating loss expected to be utilized in future years $ 9.6