Commitments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012 Person
Commitments and Contingencies Disclosure [Line Items]
Leases of warehouse and retail store space under operating lease, expiring time	2028
Maximum amount that the Company might be obligated to repay in the event franchisees defaulted	$ 114.0
Number of plaintiffs	247
Number of employees opted for lawsuit	20
Maximum percentage of class size expected to represent class members in lawsuit	10.00%
Loss contingency, estimate of probable loss	4.9
Minimum range of possible loss	0
Maximum range of possible loss	11.8
Franchise Loan Program
Commitments and Contingencies Disclosure [Line Items]
Maximum amount that the Company might be obligated to repay in the event franchisees defaulted	89.1
Other Debt Facilities
Commitments and Contingencies Disclosure [Line Items]
Maximum amount that the Company might be obligated to repay in the event franchisees defaulted	24.9
Minimum
Commitments and Contingencies Disclosure [Line Items]
Renewal options of leases for additional periods	1 year
Maximum
Commitments and Contingencies Disclosure [Line Items]
Renewal options of leases for additional periods	15 years
Leases of transportation and computer equipment under operating leases, expiring period	5 years
Advertising and Marketing Programs
Commitments and Contingencies Disclosure [Line Items]
Non-cancelable commitments	24.1
Vehicles
Commitments and Contingencies Disclosure [Line Items]
Non-cancelable commitments	$ 9.8