Segments - Summary of Company's Assets by Reportable Segment (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]
Total consolidated assets	$ 1,420,232	$ 1,353,416
Operating Segments | Franchise revenue
Segment Reporting, Asset Reconciling Item [Line Items]
Total consolidated assets	189,192	185,899
Operating Segments | Corporate-owned Stores
Segment Reporting, Asset Reconciling Item [Line Items]
Total consolidated assets	390,101	243,221
Operating Segments | Equipment revenue
Segment Reporting, Asset Reconciling Item [Line Items]
Total consolidated assets	195,022	210,462
Unallocated
Segment Reporting, Asset Reconciling Item [Line Items]
Total consolidated assets	$ 645,917	$ 713,834