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Retirement Plan - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Compensation And Retirement Disclosure [Abstract]
Employer contribution for first 3% of employee contributions			100.00%
Employer contribution for next 2% of employee contributions			50.00%
Percentage of first specified employee contributions			3.00%
Percentage of next specified employee contributions			2.00%
Company contribution for retirement plan	$ 26,771	$ 23,926	$ 36,179	$ 35,806

X

- Definition

Percentage of first specified percentage of employee contribution.

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- Definition

Percentage of matching contribution for first specified percentage of employee contribution.

+ References

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- Definition

Percentage of matching contribution for next specified percentage of employee contribution.

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- Definition

Percentage of next specified percentage of employee contribution.

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

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