Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Schedule of Future Minimum Lease Payments Under Operating Leases with Non Cancelable Terms (Detail)

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Commitments and Contingencies - Schedule of Future Minimum Lease Payments Under Operating Leases with Non Cancelable Terms (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2018 $ 6,867
2019 4,742
2020 3,009
2021 1,409
2022 902
Thereafter 1,413
Total $ 18,342