Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Future Minimum Annual Rental Commitments under Non-Cancelable Operating Leases (Detail)

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Commitments and Contingencies - Future Minimum Annual Rental Commitments under Non-Cancelable Operating Leases (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2018 $ 5,621
2019 4,759
2020 4,244
2021 2,746
2022 2,138
Thereafter 7,743
Total $ 27,251