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Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Mar. 31, 2013	Mar. 31, 2012
Income Taxes [Line Items]
Income tax expense	$ 1,903,864	$ 1,099,738
Effective income tax rate	38.30%	36.50%
Federal \| Minimum
Income Taxes [Line Items]
Tax years subject to examination	2009
Federal \| Maximum
Income Taxes [Line Items]
Tax years subject to examination	2012
State \| Minimum
Income Taxes [Line Items]
Tax years subject to examination	2009
State \| Maximum
Income Taxes [Line Items]
Tax years subject to examination	2012
Italy \| Minimum
Income Taxes [Line Items]
Tax years subject to examination	2009
Italy \| Maximum
Income Taxes [Line Items]
Tax years subject to examination	2012

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

+ References+ Details

- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

+ References+ Details