Quarterly report pursuant to Section 13 or 15(d)

Leases - Additional Information (Detail)

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Leases - Additional Information (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Lessee, Lease, Description [Line Items]      
Right-of-use assets $ 49,100,000   $ 52,200,000
Total lease liabilities - Operating leases $ 52,008,000   $ 54,000,000.0
Operating Lease, Liability, Statement of Financial Position [Extensible List] Accrued expenses and other liabilities   Accrued expenses and other liabilities
Weighted average remaining lease term 8 years 6 months 25 days   8 years 9 months
Weighted average discount rate (percent) 2.42%   2.43%
Net lease expense $ 2,100,000 $ 2,000,000.0  
Operating lease costs 2,000,000.0 2,000,000.0  
Sublease income 33,000 33,000  
Cash paid for amounts included in the measurement of Company's operating lease liabilities $ 2,000,000.0 $ 2,000,000.0  
Minimum      
Lessee, Lease, Description [Line Items]      
Operating lease remaining term 1 year    
Finance lease remaining term 1 year    
Maximum [Member]      
Lessee, Lease, Description [Line Items]      
Operating lease remaining term 13 years    
Finance lease remaining term 13 years    
Operating lease extension term 5 years    
Finance lease extension term 5 years