Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012
Accounting Policies [Abstract]
Contributions from franchisees to advertising and media funds	$ 0.6	$ 0.5	$ 2.0	$ 1.6