Commitments and Contingencies - Narrative (Details)		12 Months Ended
	Oct. 23, 2018 CAD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Oct. 23, 2018 USD ($)	Oct. 22, 2018 USD ($)
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		$ 112,800,000	$ 104,300,000	$ 116,200,000
Future sublease rental income in one year		4,100,000
Future sublease rental income in two years		3,000,000
Future sublease rental income in three years		2,300,000
Future sublease rental income in four years		1,400,000
Future sublease rental income in five years		1,000,000
Future sublease rental income in five years and thereafter		$ 800,000
Loan due In full, term (in days)		90 days
Portion that company might be obligated to repay in the event franchisees defaulted		$ 39,000,000
Fair value of franchise related borrowings		300,000
Loan facility maximum commitment amount					$ 55,000,000	$ 85,000,000
Accrued regulatory expense		1,400,000	7,300,000
Liability reserve		$ 500,000	600,000
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		$ 2,000,000
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		$ 1,500,000
Minimum range of possible loss		6,000,000
Closure of Company Operated Stores
Commitments And Contingencies Disclosure [Line Items]
Rental expense		2,100,000	13,400,000	$ 11,600,000
Marketing and Advertising Expense
Commitments And Contingencies Disclosure [Line Items]
Non-cancelable commitments		25,500,000
Non-cancelable commitments due in 2019		12,200,000
Non-cancelable commitments due in 2020		9,400,000
Non-cancelable commitments due in 2021		2,900,000
Non-cancelable commitments due in 2022		1,000,000
Unused Credit Card Lines
Commitments And Contingencies Disclosure [Line Items]
Remaining credit available		$ 316,400,000	$ 354,500,000
Canada
Commitments And Contingencies Disclosure [Line Items]
Loan facility maximum Canadian sub facility commitment amount	$ 25,000,000