Commitments and Contingencies - Narrative (Details)		12 Months Ended
	Dec. 06, 2016 CAD	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 06, 2016 USD ($)	Dec. 05, 2016 USD ($)	Oct. 26, 2010 $ / violation
Commitments And Contingencies Disclosure [Line Items]
Leases of warehouse and retail store space under operating lease, expiring time		2033
Lease term (in years)		15 years
Rental expense		$ 104,300,000	$ 116,200,000	$ 116,500,000
Future sublease rental income in one year		5,000,000
Future sublease rental income in two years		4,200,000
Future sublease rental income in three years		3,100,000
Future sublease rental income in four years		2,400,000
Future sublease rental income in five years		1,600,000
Future sublease rental income in five years and thereafter		$ 1,700,000
Loan facility maximum commitment amount					$ 85,000,000	$ 125,000,000
Loan due In full, term (in days)		90 days
Portion that company might be obligated to repay in the event franchisees defaulted		$ 45,300,000
Fair value of franchise related borrowings		700,000
Accrued regulatory expense		$ 7,300,000	6,000,000
Maximum 401 (k) plan contribution rates as percentage of employees earnings		75.00%
Employer 401 (k) matching contribution to employee, 50% Maximum		50.00%
Initial employer 401(k) matching contribution to employee (percentage)		4.00%
Compensation expense related to 401(k) savings plan		$ 5,700,000	5,400,000	$ 4,700,000
Liability reserve		$ 600,000	500,000
Minimum
Commitments And Contingencies Disclosure [Line Items]
Renewal options of leases for additional periods (in years)		1 year
Loss contingency in excess of accrual, range of possible loss		$ 0
Minimum range of possible loss		$ 500,000
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
Loss contingency in excess of accrual, range of possible loss		$ 1,000,000
Minimum range of possible loss		$ 3,500,000
Initial employer 401(k) matching contribution to employee (percentage)		3.00%
Closure of Company Operated Stores
Commitments And Contingencies Disclosure [Line Items]
Rental expense		$ 13,400,000	11,600,000
Marketing and Advertising Expense
Commitments And Contingencies Disclosure [Line Items]
Non-cancelable commitments		20,300,000
Non-cancelable commitments due in 2016		9,800,000
Non-cancelable commitments due in 2017		7,200,000
Non-cancelable commitments due in 2018		2,700,000
Non-cancelable commitments due in 2019		700,000
Margaret Korrow
Commitments And Contingencies Disclosure [Line Items]
Statutory penalty damages, per violation (in dollars per violation) | $ / violation							100
Unused Credit Card Lines
Commitments And Contingencies Disclosure [Line Items]
Remaining credit available		$ 354,500,000	$ 366,400,000
Canada
Commitments And Contingencies Disclosure [Line Items]
Loan facility maximum Canadian sub facility commitment amount | CAD	CAD 25,000,000