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Basis of Presentation - Inventory - Additional Information (Detail) - USD ($) | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Inventory [Line Items] |  |
Inventory and other | $ 25,895,000 | $ 22,964,000
Materials and supplies inventory |  |
Inventory [Line Items] |  |
Inventory and other | 9,500,000 | 8,000,000.0
Commodity inventory |  |
Inventory [Line Items] |  |
Inventory and other | $ 836,000 | $ 965,000

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