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Subsequent Events - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 27, 2017
Oct. 31, 2020
Sep. 30, 2020
Dec. 31, 2020
Sep. 30, 2020
Sep. 30, 2020
Subsequent Event [Line Items]            
Repayment of term loan $ 231.0         $ 5.0
Starter China Limited            
Subsequent Event [Line Items]            
Sales of equity interest       $ 16.0    
Net proceeds from sales     $ 15.6      
Senior Secured Term Loan            
Subsequent Event [Line Items]            
Repayment of term loan         $ 44.7  
Senior Secured Term Loan | Starter China Limited | Subsequent Event            
Subsequent Event [Line Items]            
Repayment of term loan   $ 11.7