Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Schedule of Future Minimum Lease Payments for Operating Leases (Detail)

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Commitments and Contingencies - Schedule of Future Minimum Lease Payments for Operating Leases (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2018 $ 18,650
2019 16,468
2020 15,423
2021 12,997
2022 9,364
Thereafter 13,995
Operating Leases, Future Minimum Payments Due, Total $ 86,897