Segments - Summary of Company's Assets by Reportable Segment (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]
Total consolidated assets	$ 1,523,467	$ 1,353,416
Operating Segments | Franchise revenue
Segment Reporting, Asset Reconciling Item [Line Items]
Total consolidated assets	351,615	319,422
Operating Segments | Corporate-owned Stores
Segment Reporting, Asset Reconciling Item [Line Items]
Total consolidated assets	370,212	243,221
Operating Segments | Equipment revenue
Segment Reporting, Asset Reconciling Item [Line Items]
Total consolidated assets	185,284	210,462
Unallocated
Segment Reporting, Asset Reconciling Item [Line Items]
Total consolidated assets	$ 616,356	$ 580,311