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Leases - Components of lease costs and supplemental information related to leases (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Lease Assets and Liabilities      
ROU assets $ 16,917   $ 18,522
Total lease liabilities 19,484   $ 21,392
Lease Cost      
Operating lease expense 1,623 $ 2,100  
Total lease expense 1,623 2,100  
Other Information      
Operating cash outflows from operating leases, net $ 1,935 $ 2,746  
Lease Term and Discount Rate      
Weighted average remaining lease term (years) 3 years 11 months 26 days   4 years 2 months 4 days
Weighted average discount rate 3.34%   3.34%