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Commitments & Contingencies - Future Purchase Commitments (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2017 $ 36,238
2018 7,791
2019 3,107
2020 1,642
2021 481
Thereafter 5
Unconditional purchase obligations over next six years $ 49,264