Segments - Summary of Company's Goodwill by Reportable Segment (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated goodwill	$ 227,821	$ 227,821
Franchise revenue
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated goodwill	16,938	16,938
Corporate-owned stores
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated goodwill	118,217	118,217
Equipment revenue
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated goodwill	$ 92,666	$ 92,666

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant