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Leases - Components of lease costs and supplemental information related to leases (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Lease Assets and Liabilities          
ROU assets $ 17,269   $ 17,269   $ 18,522
Total lease liabilities 19,595   19,595   $ 21,392
Lease Cost          
Operating lease expense 1,623 $ 1,906 3,246 $ 4,006  
Total lease expense 1,623 1,906 3,246 4,006  
Other Information          
Operating cash outflows from operating leases, net $ 1,869 $ 2,113 $ 3,804 $ 4,859  
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 2 months 4 days
Weighted average discount rate 3.24%   3.24%   3.34%