Segments - Summary of Company's Goodwill by Reportable Segment (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Segment Reporting, Other Significant Reconciling Item [Line Items]
Goodwill, net carrying amount	$ 206,752	$ 199,513
Franchise revenue
Segment Reporting, Other Significant Reconciling Item [Line Items]
Goodwill, net carrying amount	16,938	16,938
Corporate-owned Stores
Segment Reporting, Other Significant Reconciling Item [Line Items]
Goodwill, net carrying amount	97,148	89,909
Equipment revenue
Segment Reporting, Other Significant Reconciling Item [Line Items]
Goodwill, net carrying amount	$ 92,666	$ 92,666