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, 2016
Dec. 31, 2015
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]      
Rental expense $ 3,900 $ 2,900 $ 3,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity      
2017 2,380    
2018 1,872    
2019 1,496    
2020 137    
2021 0    
Total 5,885    
Purchase commitments outstanding $ 98,500