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Commitments and Contingencies - Future Minimum Rental Payments Required Under Non-Cancelable Leases (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2017 $ 3,204
2018 1,948
2019 1,196
2020 650
2021 219
Thereafter 0
Total $ 7,217