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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Lease Assets and Liabilities          
ROU assets $ 23,025   $ 23,025   $ 22,696
Total lease liabilities 25,199   25,199   $ 24,458
Lease Cost          
Operating lease expense [1] 1,832 $ 1,846 5,513 $ 5,541  
Sublease income 0 0 0 0  
Total lease expense 1,832 1,846 5,513 5,541  
Other Information          
Operating cash outflows from operating leases, net $ 1,682 $ 1,882 $ 4,951 $ 5,593  
Lease Term and Discount Rate          
Weighted average remaining lease term (years) 4 years 1 month 13 days   4 years 1 month 13 days   4 years 1 month 13 days
Weighted average discount rate 3.43%   3.43%   2.80%
[1] Includes short-term leases and variable lease costs, which are immaterial.