Income Taxes - Additional Information (Detail) (USD $)
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3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Income Taxes [Line Items] | ||||
Income tax expense | $ 3,467,219 | $ 2,347,873 | $ 5,371,083 | $ 3,447,611 |
Effective income tax rate | 37.00% | 38.60% | 37.50% | 37.90% |
Federal | Minimum
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Income Taxes [Line Items] | ||||
Tax years subject to examination | 2009 | |||
Federal | Maximum
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Income Taxes [Line Items] | ||||
Tax years subject to examination | 2012 | |||
State | Minimum
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Income Taxes [Line Items] | ||||
Tax years subject to examination | 2009 | |||
State | Maximum
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Income Taxes [Line Items] | ||||
Tax years subject to examination | 2012 | |||
Italy | Minimum
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Income Taxes [Line Items] | ||||
Tax years subject to examination | 2009 | |||
Italy | Maximum
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Income Taxes [Line Items] | ||||
Tax years subject to examination | 2012 |