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Basis of Presentation - Inventory - Additional Information (Detail) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Inventory [Line Items] |  |
Inventory and other | $ 24,488,000 | $ 21,346,000
Materials and supplies inventory |  |
Inventory [Line Items] |  |
Inventory and other | 9,100,000 | 12,100,000
Commodity inventory |  |
Inventory [Line Items] |  |
Inventory and other | $ 1,500,000 | $ 508,000

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