ABG Profit Participation Arrangement - Additional Information (Detail) - USD ($)							1 Months Ended	9 Months Ended
	Jan. 01, 2021	Jul. 01, 2020	Jan. 24, 2020	Jan. 01, 2020	Oct. 01, 2019	Apr. 01, 2019	Jan. 31, 2020	Sep. 30, 2019
Class Of Stock [Line Items]
Obligation to pay the additional consideration								$ (17,019,000)
A And R Profit Participation Agreement [Member]
Class Of Stock [Line Items]
Finance receivables write-offs through impairment of assets							$ 7,011,000
Finance receivable write-off through accumulated deficit							$ 28,900,000
ABG Intermediate Holdings Two LLC [Member] | A And R Profit Participation Agreement [Member]
Class Of Stock [Line Items]
Minimum participation rights with respect to each contract year			$ 10,000,000
ABG Prince Agreement [Member] | Scenario Forecast [Member]
Class Of Stock [Line Items]
Quarterly royalty payment in 2021, until maturity in 2025	$ 375,000
Class 2 Common Stock [Member] | ABG Intermediate Holdings Two LLC [Member] | A And R Profit Participation Agreement [Member]
Class Of Stock [Line Items]
Obligation to pay the additional consideration			$ (83,333,000)
Minimum [Member] | ABG Intermediate Holdings Two LLC [Member] | A And R Profit Participation Agreement [Member]
Class Of Stock [Line Items]
Percentage of participation rights			49.00%
Minimum [Member] | ABG Prince Agreement [Member]
Class Of Stock [Line Items]
Guaranteed minimum royalty payment		$ 500,000		$ 500,000	$ 500,000	$ 500,000