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Leases - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lease And Rental Expense [Line Items]    
Right-of-use asset $ 47.1 $ 41.4
Lease liability 48.2 $ 42.0
Expected annual subleases income 0.4  
ASU No. 2016-02 [Member]    
Lease And Rental Expense [Line Items]    
Estimated ROU assets and lease liabilities $ 0.6