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Income Taxes - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Income Taxes [Line Items]        
Income tax expense $ 2,347,873 $ 1,349,655 $ 3,447,611 $ 1,541,001
Effective income tax rate 38.60% 37.00% 37.90% 37.00%
Federal | Minimum
       
Income Taxes [Line Items]        
Tax years subject to examination     2008  
Federal | Maximum
       
Income Taxes [Line Items]        
Tax years subject to examination     2011  
State | Minimum
       
Income Taxes [Line Items]        
Tax years subject to examination     2008  
State | Maximum
       
Income Taxes [Line Items]        
Tax years subject to examination     2011  
ITALY | Minimum
       
Income Taxes [Line Items]        
Tax years subject to examination     2009  
ITALY | Maximum
       
Income Taxes [Line Items]        
Tax years subject to examination     2011