Line of Credit - Additional Information (Detail) (USD $)	9 Months Ended	1 Months Ended
	Sep. 30, 2013	Oct. 21, 2013 Subsequent Event
Line of Credit Facility [Line Items]
Credit agreement borrowings maximum	$ 35,000,000
Revolving line of credit agreement, expiration date	Jul. 30, 2015
Outstanding borrowings	15,400,000
Interest rate on borrowings	3.24%
Amount reserved for outstanding letters of credit	11,800,000
Net unamortized deferred fees and costs	300,000
Proceeds from loans		19,621,941
Early termination fee		$ 350,000