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Income Taxes - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
May 08, 2012
Income Taxes [Line Items]      
Business acquisition, goodwill     $ 151,500,000
Goodwill related to business acquisition deductible for income tax purposes, term   15 years  
Deferred tax liability 700,000 700,000  
Deferred tax expense $ 700,000 $ 673,000