Background and Basis of Presentation - Additional Information (Detail) (USD $)	1 Months Ended	9 Months Ended		12 Months Ended				1 Months Ended
	Mar. 22, 2013	Sep. 30, 2013 Employee	Sep. 30, 2012	Dec. 31, 2012 Employee	Dec. 31, 2011	Apr. 26, 2013	Oct. 02, 2013 Subsequent event	Aug. 31, 2001 McDonald's Corporation
Organization and Nature of Operations [Line Items]
Terminated relationship period with customers								25 years
Capital contribution made by company	$ 3,150,000	$ 5,000,000				$ 1,850,000	$ 3,500,000
Capital contribution made by company, percentage of voting power	60.00%
Interest in economic returns, percentage	60.00%
Number of employees		4		4
Net cash used in operating activities		$ (816,000)	$ (1,105,000)	$ (1,500,000)	$ (1,900,000)
Minimum period to operate company on basis of sufficient capital resources and liquidity		1 year