Segments - Summary of Company's Goodwill by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Segment Reporting, Other Significant Reconciling Item [Line Items]
Revenue	$ 148,817	$ 121,333
Goodwill, net carrying amount	199,513		$ 199,513
Franchise revenue
Segment Reporting, Other Significant Reconciling Item [Line Items]
Revenue	65,762	54,612
Goodwill, net carrying amount	16,938		16,938
Corporate-owned Stores
Segment Reporting, Other Significant Reconciling Item [Line Items]
Revenue	38,044	32,708
Goodwill, net carrying amount	89,909		89,909
Equipment revenue
Segment Reporting, Other Significant Reconciling Item [Line Items]
Revenue	45,011	$ 34,013
Goodwill, net carrying amount	$ 92,666		$ 92,666