Acquisitions - Additional Information (Detail)	1 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) Franchised_Stores	Jul. 31, 2018 USD ($) Franchised_Stores	Sep. 30, 2018 USD ($)	Mar. 31, 2018 USD ($) Franchised_Stores Stores	Sep. 30, 2018 USD ($)	Dec. 31, 2017
Business Acquisition [Line Items]
Reduction in intangible asset amortization expense, non-recurring			$ 2,638,000
Granmark [Member]
Business Acquisition [Line Items]
Business combination, acquisition percentage						85.00%
Business combination, percentage of remaining interest					15.00%
Business combination, period to acquire remaining interest					4 years
Liability recorded for the estimated purchase price of remaining interest to be acquired	$ 3,021,000		$ 3,021,000		$ 3,021,000
Print Appeal Inc [Member]
Business Acquisition [Line Items]
Business combination, acquisition percentage						60.00%
Business combination, percentage of remaining interest					40.00%
Business combination, period to acquire remaining interest					5 years
Estimated purchase price interest					$ 2,312,000
Maryland [Member]
Business Acquisition [Line Items]
Number of franchise stores acquired | Franchised_Stores				11
Total consideration amount				$ 14,000,000
TEXAS [Member]
Business Acquisition [Line Items]
Total consideration amount				$ 6,000,000
Number of independent stores to be acquired | Stores				11
Period which control over acquired stores				1 year
Pennsylvania [Member]
Business Acquisition [Line Items]
Number of franchise stores acquired | Franchised_Stores		16
Total consideration amount		$ 18,800,000
Minnesota, North Dakota and Texas [Member]
Business Acquisition [Line Items]
Number of franchise stores acquired | Franchised_Stores	21
Total consideration amount	$ 22,900,000