Bank Lines of Credit - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 112,500
Line of Credit Facility, Interest Rate Description	banks prime rate plus 1%
Line of Credit Facility, Amount Outstanding	$ 112,500	$ 112,500