Annual report pursuant to Section 13 and 15(d)

Leases - Additional Information (Detail)

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Leases - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Lessee, Lease, Description [Line Items]        
Right-of-use assets $ 46,300 $ 52,200    
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Prepaid expenses and other assets Prepaid expenses and other assets    
Total lease liabilities - Operating leases $ 49,712 $ 54,000    
Operating Lease, Liability, Statement of Financial Position [Extensible List] us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent    
Net rental expenses $ 8,500 $ 8,500 $ 7,900  
Weighted average remaining lease term 7 years 10 months 6 days 8 years 9 months    
Weighted average discount rate (percent) 2.38% 2.43%    
Net lease expense $ 8,500 $ 8,500 7,900  
Operating lease costs 8,100 8,500 8,000  
Cash paid for amounts included in the measurement of Company's operating lease liabilities $ 8,000 $ 7,600 $ 7,200  
ASU 2016-02        
Lessee, Lease, Description [Line Items]        
Right-of-use assets       $ 40,900
Total lease liabilities - Operating leases       $ 40,900
Minimum        
Lessee, Lease, Description [Line Items]        
Operating lease remaining term 1 year      
Finance lease remaining term 1 year      
Maximum        
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