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Commitments & Contingencies - Future Purchase Commitments (Detail)
Dec. 31, 2020
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2020 $ 27,591,000
2021 22,324,000
2022 9,658,000
2023 1,572,000
2024 363,000
Unconditional purchase obligations over next six years $ 61,508,000