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Fair Value - Additional Information (Detail)
$ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
Seat
Jun. 30, 2020
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of ROU assets $ 0.4 $ 5.0
Fair value of property and equipment $ 0.0 $ 0.0
Exit Of Leased Space [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Number of seats transitioned to at home | Seat 4,200  
Asset impairment charges $ 0.5  
Software [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of property and equipment 0.0  
Software [Member] | Other Segment [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset impairment charges $ 0.3