Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Taxes [Line Items]
Income tax expense	$ 1,036,349	$ 1,794,575	$ 4,483,960	$ 3,335,576
Effective income tax rate	38.60%	37.60%	38.10%	37.40%
Federal | Minimum
Income Taxes [Line Items]
Tax years subject to examination			2009
Federal | Maximum
Income Taxes [Line Items]
Tax years subject to examination			2011
State | Minimum
Income Taxes [Line Items]
Tax years subject to examination			2009
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