Acquisitions - Additional Information (Detail) $ in Thousands	1 Months Ended				12 Months Ended
	Nov. 30, 2019 USD ($)	Sep. 30, 2018 USD ($) Franchised_Stores	Jul. 31, 2018 USD ($) Franchised_Stores	Mar. 31, 2018 USD ($) Franchised_Stores	Dec. 31, 2019 Store	Dec. 31, 2018 USD ($) Store
Business Acquisition [Line Items]
Total consideration amount	$ 9,000
Maryland [Member]
Business Acquisition [Line Items]
Number of franchise stores acquired | Franchised_Stores				11
Total consideration amount				$ 17,000
Fair value inventories acquired				3,500
Fair value property, plant and equipment acquired				200
Fair value intangible asset acquired				4,000
Fair value liability due to unfavorable leases conditions				$ 100
Pennsylvania [Member]
Business Acquisition [Line Items]
Number of franchise stores acquired | Franchised_Stores			16
Total consideration amount			$ 20,500
Fair value inventories acquired			4,200
Fair value property, plant and equipment acquired			500
Fair value intangible asset acquired			3,400
Fair value asset due to favorable leases conditions			$ 500
Minnesota [Member]
Business Acquisition [Line Items]
Number of franchise stores acquired | Franchised_Stores		21
Total consideration amount		$ 26,300
Fair value inventories acquired		7,500
Fair value property, plant and equipment acquired		500
Fair value intangible asset acquired		7,300
Fair value asset due to favorable leases conditions		$ 200
TEXAS [Member]
Business Acquisition [Line Items]
Total consideration amount						$ 4,400
Number of independent stores to be acquired | Store					11	11
Period which control over acquired stores						2 years
Number of assembled workforce | Store						8