Commitments and Contingencies - Narrative (Details)		3 Months Ended	12 Months Ended
	Feb. 27, 2013 USD ($)	Jun. 30, 2014 store	Dec. 31, 2015 USD ($) card	Dec. 31, 2015 CAD card	Dec. 31, 2014 USD ($) store	Dec. 31, 2013 USD ($)	Oct. 26, 2010 $ / violation
Commitments And Contingencies Disclosure [Line Items]
Leases of warehouse and retail store space under operating lease, expiring time			2033	2033
Lease term (in years)			15 years	15 years
Rental expense			$ 116,500,000		$ 116,400,000	$ 110,000,000
Number of store closures | store		44			44
Sublease income			4,600,000		$ 3,900,000	2,600,000
Future sublease rental income in one year			5,100,000
Future sublease rental income in two years			4,500,000
Future sublease rental income in three years			4,000,000
Future sublease rental income in four years			3,100,000
Future sublease rental income in five years			2,000,000
Future sublease rental income in five years and thereafter			$ 3,600,000
Loan due In full, term (in days)			90 days	90 days
Portion that company might be obligated to repay in the event franchisees defaulted			$ 81,000,000
Fair value of franchise related borrowings			863,000
Loan facility maximum commitment amount			175,000,000
Accrued regulatory expense			10,000,000
Minimum range of possible loss			476,000
Maximum range of possible loss			$ 2,537,000
Maximum 401 (k) plan contribution rates as percentage of employees earnings			75.00%	75.00%
Employer 401 (k) matching contribution to employee, maximum (percentage)			100.00%	100.00%
Employer 401 (k) matching contribution to employee, 50% Maximum			50.00%	50.00%
Initial employer 401(k) matching contribution to employee (percentage)			4.00%
Compensation expense related to 401(k) savings plan			$ 4,700,000		4,300,000	$ 3,300,000
Number of open credit cards | card			82,000	82,000
Number of open credit cards with remaining credit available | card			81,800	81,800
Minimum
Commitments And Contingencies Disclosure [Line Items]
Renewal options of leases for additional periods (in years)			1 year	1 year
Loss contingency in excess of accrual, range of possible loss			$ 0
Initial employer 401(k) matching contribution to employee (percentage)			2.00%
Maximum
Commitments And Contingencies Disclosure [Line Items]
Renewal options of leases for additional periods (in years)			20 years	20 years
Loss contingency in excess of accrual, range of possible loss			$ 2,917,500.0000
Initial employer 401(k) matching contribution to employee (percentage)			3.00%
Closure of Company Operated Stores
Commitments And Contingencies Disclosure [Line Items]
Rental expense					$ 4,800,000
Number of store closures | store					44
Amendment | Franchise Loan Facility
Commitments And Contingencies Disclosure [Line Items]
Loan facility maximum Canadian sub facility commitment amount | CAD				CAD 50,000,000
Marketing and Advertising Expense
Commitments And Contingencies Disclosure [Line Items]
Non-cancelable commitments			$ 22,600,000
Non-cancelable commitments due in 2016			6,700,000
Non-cancelable commitments due in 2017			7,200,000
Non-cancelable commitments due in 2018			4,200,000
Non-cancelable commitments due in 2019			2,300,000
Non-cancelable commitments due in 2020			1,600,000
Non-cancelable commitments due thereafter			568,000
Margaret Korrow
Commitments And Contingencies Disclosure [Line Items]
Statutory penalty damages, per violation (in dollars per violation) | $ / violation							100
Lomi Price | Maximum
Commitments And Contingencies Disclosure [Line Items]
Damages sought (not less than)	$ 250,000
Unused Credit Card Lines
Commitments And Contingencies Disclosure [Line Items]
Remaining credit available			$ 378,700,000