Quarterly report pursuant to Section 13 or 15(d)

Leases - Additional Information (Detail)

v3.20.2
Leases - Additional Information (Detail)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2019
USD ($)
lease
Lessee, Lease, Description [Line Items]            
Number of leases | lease           42
Right-of-use assets $ 51,600   $ 51,600   $ 36,500  
Total lease liabilities - Operating leases 54,597   54,597   $ 37,200  
Net lease expense $ 2,000 $ 2,100 $ 6,100 $ 5,900    
Weighted average remaining lease term 9 years 3 days   9 years 3 days   8 years 6 months 25 days  
Weighted average discount rate (percent) 2.43% 3.24% 2.43% 3.24%    
Cash paid for amounts used in the measurement of Company's operating lease liabilities $ 1,600 $ 1,700 $ 5,400 $ 3,400    
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]            
Initial lease terms 2 years   2 years      
Lease renewal term 2 years   2 years      
Maximum            
Lessee, Lease, Description [Line Items]            
Initial lease terms 25 years   25 years      
Lease renewal term 12 years   12 years