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Leases - Components of lease costs and supplemental information related to leases (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Lease Assets and Liabilities    
ROU assets $ 17,959 $ 17,959
Total lease liabilities 21,157 21,157
Lease Cost    
Operating lease expense 1,906 [1] 4,006 [1]
Sublease income 0 0
Total lease expense 1,906 4,006
Other Information    
Operating cash outflows from operating leases $ 2,113 $ 4,859
Lease Term and Discount Rate    
Weighted average remaining lease term (years) 4 years 1 month 9 days 4 years 1 month 9 days
Weighted average discount rate 3.50% 3.50%
[1] Includes short-term leases and variable lease costs, which are immaterial.