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Commitments & Contingencies - Future Purchase Commitments (Detail)
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 $ 33,724,000
2020 10,075,000
2021 5,077,000
2022 2,283,000
Unconditional purchase obligations over next six years $ 51,159,000