Segments - Summary of Company's Goodwill by Reportable Segment (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Segment Reporting, Other Significant Reconciling Item [Line Items]
Goodwill, net carrying amount	$ 191,038	$ 176,981	$ 176,981
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	81,434		67,377
Equipment revenue
Segment Reporting, Other Significant Reconciling Item [Line Items]
Goodwill, net carrying amount	$ 92,666		$ 92,666