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Leases - Components of lease costs and supplemental information related to leases (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Lease Assets and Liabilities          
ROU assets $ 23,560   $ 23,560   $ 19,274
Total lease liabilities 25,092   25,092   $ 20,864
Lease Cost          
Operating lease expense [1] 1,846 $ 1,634 5,541 $ 4,977  
Sublease income 0 0 0 0  
Total lease expense 1,846 1,634 5,541 4,977  
Other Information          
Operating cash outflows from operating leases, net $ 1,882 $ 1,700 $ 5,593 $ 5,364  
Lease Term and Discount Rate          
Weighted average remaining lease term (years) 4 years 2 months 26 days   4 years 2 months 26 days   4 years 3 months 3 days
Weighted average discount rate 2.72%   2.72%   2.41%
[1] Includes short-term leases and variable lease costs, which are immaterial.