Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Schedule of Future Minimum Lease Payment Commitments (Detail)

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Commitments and Contingencies - Schedule of Future Minimum Lease Payment Commitments (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]      
Rental expense $ 3,500 $ 3,900 $ 2,900
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity      
2018 4,141    
2019 2,194    
2020 530    
2021 115    
2022 0    
Total 6,980    
Purchase commitments outstanding $ 178,100