Commitments and Contingencies - Additional Information (Detail)	3 Months Ended	9 Months Ended	12 Months Ended							12 Months Ended			0 Months Ended	12 Months Ended
	Jun. 30, 2014 store	Sep. 30, 2014	Dec. 31, 2014 USD ($) store	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Apr. 14, 2014 USD ($)	Apr. 12, 2014 USD ($)	Dec. 31, 2014 Marketing and Advertising Expense USD ($)	Oct. 26, 2010 Margaret Korrow	Dec. 31, 2014 Closure of Company Operated Stores USD ($) store	Dec. 31, 2014 Amendment Franchise Loan Facility CAD	Dec. 31, 2014 Minimum	Feb. 27, 2013 Minimum Lomi Price USD ($)	Dec. 31, 2014 Maximum
Commitments and Contingencies Disclosure [Line Items]
Leases of warehouse and retail store space under operating lease, expiring time			2029
Renewal options of leases for additional periods												1 year		20 years
Lease term			15 years
Leases of transportation and computer equipment under operating leases, expiring period														4 years
Rental expense			$ 116,400,000	$ 110,000,000	$ 102,000,000					$ 4,800,000
Number of store closures	44		44							44
Sublease income			3,900,000	2,600,000	3,100,000
Future sublease rental income in one year			4,500,000
Future sublease rental income in two years			3,900,000
Future sublease rental income in three years			3,300,000
Future sublease rental income in four years			3,000,000
Future sublease rental income in five years			2,500,000
Future sublease rental income in five years and thereafter			5,200,000
Loan due In full, term		90 days
Portion that Company might be obligated to repay in the event franchisees defaulted			89,800,000
Fair value of franchise related borrowings			1,400,000
Loan facility maximum commitment amount			175,000,000			175,000,000.0	200,000,000.0
Loan facility maximum Canadian sub facility commitment amount											50,000,000
Accrued regulatory expense			33,600,000
Loss contingency in excess of accrual, range of possible loss, minimum			0
Loss contingency in excess of accrual, range of possible loss, maximum			4,000,000
Minimum range of possible loss			158,000
Maximum range of possible loss			467,000
Statutory penalty damages, per violation (in dollars per violation)									100
Loss contingency, damages sought, value													250,000
Non-cancelable commitments								20,800,000
Non-cancelable commitments due in 2015								18,000,000
Non-cancelable commitments due in 2016								1,700,000
Non-cancelable commitments due in 2017								776,000
Non-cancelable commitments due in 2018								363,000
Maximum 401 (k) plan contribution rates as percentage of employees earnings			100.00%
Employer 401 (k) matching contribution to employee, Maximum			100.00%
Initial employer 401(k) matching contribution to employee			4.00%									2.00%		3.00%
Employer 401 (k) matching contribution to employee, 50% Maximum			50.00%
Compensation expense related to 401(k) savings plan			$ 4,300,000	$ 3,275,000	$ 999,000