Quarterly report pursuant to Section 13 or 15(d)

Leases - Additional Information (Detail)

v3.21.2
Leases - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Lessee, Lease, Description [Line Items]          
Right-of-use assets $ 48,200   $ 48,200   $ 52,200
Total lease liabilities - Operating leases $ 51,670   $ 51,670   $ 54,000
Operating Lease, Liability, Statement of Financial Position [Extensible List] Accrued expenses and other liabilities   Accrued expenses and other liabilities   Accrued expenses and other liabilities
Weighted average remaining lease term 8 years 3 days   8 years 3 days   8 years 9 months
Weighted average discount rate (percent) 2.38%   2.38%   2.43%
Net lease expense $ 2,300 $ 2,000 $ 6,300 $ 6,100  
Operating lease costs 2,000 2,000 6,100 6,100  
Cash paid for amounts included in the measurement of Company's operating lease liabilities $ 1,900 $ 1,700 $ 6,000 $ 5,600  
Minimum          
Lessee, Lease, Description [Line Items]          
Operating lease remaining term 1 year   1 year    
Finance lease remaining term 1 year   1 year    
Maximum [Member]          
Lessee, Lease, Description [Line Items]          
Operating lease remaining term 13 years   13 years    
Finance lease remaining term 13 years   13 years    
Operating lease extension term 5 years   5 years    
Finance lease extension term 5 years   5 years