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Commitments and Contingencies - Future Minimum Payments Required under Operating Leases that have Initial or Remaining Non-cancellable Lease Terms in Excess of One Year (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2017 $ 27,864
2018 23,185
2019 19,076
2020 19,208
2021 14,425
Thereafter $ 122,922