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Future Minimum Lease Payments Required Under These Lease Commitments (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Capital Leased Assets [Line Items]  
Capital Leases 2018 $ 361
Capital Leases 2019 361
Capital Leases 2020 361
Capital Leases 2021 361
Capital Leases 2022 30
Capital Leases Thereafter 0
Capital Leases Total minimum lease payments 1,474
Interest (172)
Present value of net minimum lease payments 1,302
Operating Leases 2018 2,466
Operating Leases 2019 1,364
Operating Leases 2020 688
Operating Leases 2021 439
Operating Leases 2022 254
Operating Leases Thereafter 0
Operating Leases Total minimum lease payments $ 5,211