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Obligations Under Non-Cancelable Operating Leases (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Operating Leased Assets [Line Items]  
Operating Leases, December 31, 2018 $ 3,611
Operating Leases, December 31, 2019 3,383
Operating Leases, December 31, 2020 3,077
Operating Leases, December 31, 2021 2,750
Operating Leases, December 31, 2022 1,464
Thereafter 786
Minimum lease payments $ 15,071