Leases - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2021 USD ($)	Sep. 26, 2020 USD ($)	Sep. 25, 2021 USD ($)	Sep. 26, 2020 USD ($)	Sep. 25, 2021 USD ($)	Sep. 25, 2021 wash_center	Sep. 25, 2021 maintenance_site	Sep. 25, 2021	Dec. 26, 2020 USD ($)
Lessee, Lease, Description [Line Items]
Sublease revenue	$ 2,000	$ 2,000	$ 5,000	$ 5,000
Number cash wash properties sold						19	3
Net gain on sale			$ 1,000
Operating lease right-of-use assets					$ 905,527				$ 884,927
Finance lease, weighted average remaining lease term	11 years 6 months		11 years 6 months
Operating lease, weighted average remaining lease term	14 years 9 months 18 days		14 years 9 months 18 days
Finance lease, weighted average discount rate, percent								5.33%
Operating lease, weighted average discount rate, percent								4.82%
March 2021 Operating Lease Agreements
Lessee, Lease, Description [Line Items]
Renewal term	20 years		20 years
Operating lease right-of-use assets					62,000
Operating lease liability					$ 59,000
Minimum | March 2021 Operating Lease Agreements
Lessee, Lease, Description [Line Items]
Lease term	15 years		15 years
Maximum | March 2021 Operating Lease Agreements
Lessee, Lease, Description [Line Items]
Lease term	20 years		20 years