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Summary of Future Minimum Rental Commitments (Detail) $ in Thousands | Dec. 31, 2018 USD ($)
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Operating Lease Liabilities Payments Due [Abstract] |
2019 | $ 3,511
2020 | 2,804
2021 | 2,501
2022 | 2,455
2023 | 1,734
Thereafter | 2,495
Total future lease commitments | $ 15,500

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