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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Lease Assets and Liabilities          
ROU assets $ 19,771   $ 19,771   $ 18,522
Total lease liabilities 21,939   21,939   $ 21,392
Lease Cost          
Operating lease expense 1,654 $ 1,628 4,900 $ 5,634  
Sublease income 0 0 0  
Total lease expense 1,654 1,628 4,900 5,634  
Other Information          
Operating cash outflows from operating leases, net $ 1,826 $ 1,640 $ 5,630 $ 6,499  
Lease Term and Discount Rate          
Weighted average remaining lease term (years) 4 years 3 months 14 days   4 years 3 months 14 days   4 years 2 months 4 days
Weighted average discount rate 2.86%   2.86%   3.34%