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Leases - Components of lease costs and supplemental information related to leases (Detail)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
Lease Assets and Liabilities  
ROU assets $ 19,809
Total lease liabilities 21,450
Lease Cost  
Operating lease expense 2,100 [1]
Sublease income 0
Total lease expense 2,100
Other Information  
Operating cash outflows from operating leases $ 2,746
Lease Term and Discount Rate  
Weighted average remaining lease term (years) 4 years 1 month 2 days
Weighted average discount rate 3.55%
[1] Includes short-term leases and variable lease costs, which are immaterial.