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Leases - Additional Information (Detail) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Leases [Line Items]    
Lessee, operating leases, option to extend Leases with renewal options allow the Company to extend the lease term typically between 1 to 10 years  
Lessee, operating lease, existence of option to extend [true false] true  
Lessee, operating lease, option to terminate real estate lease agreements include Company options to either extend and/or terminate the lease  
Lessee, operating lease, existence of option to terminate [true false] true  
Weighted average discount rate 2.90% 3.00%
Weighted average remaining lease term 14 years 4 months 24 days 15 years
Operating cash flows used for operating leases $ 11.6 $ 15.4
Tenant Improvements allowance receipts 5.0  
Remaining 2021 lease payment 4.8  
Tenant improvement allowance for 2021 $ 1.3  
Minimum [Member]    
Leases [Line Items]    
Operating leases, options to extend leases term 1 year  
Maximum [Member]    
Leases [Line Items]    
Operating leases, options to extend leases term 10 years