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Leases - Additional Information (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
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  
Leases commenced during the period $ 122.6  
Weighted average discount rate 3.00% 3.80%
Weighted average remaining lease term 15 years 3 months 18 days 5 years 1 month 6 days
Operating cash flows used for operating leases $ 11.8 $ 11.5
Remaining 2020 lease payment 2.5  
2021 lease payment 11.7  
Tenant improvement allowance 8.6  
Tenant improvement allowance for 2021 $ 8.8  
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