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Inventory - Schedule of Inventories (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Inventory [Line Items] |  |
Inventory, Net, Total | $ 15,381 | $ 19,136
Sand |  |
Inventory [Line Items] |  |
Raw material | 176 | 428
Work in progress | 5,789 | 10,465
Finished goods | 5,475 | 4,400
Spare parts | 3,941 | 3,843
Inventory, Net, Total | $ 15,381 | $ 19,136

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