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Inventory - Schedule of Inventories (Detail) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Inventory [Line Items] |  |
Inventory, Net, Total | $ 20,287 | $ 21,415
Sand |  |
Inventory [Line Items] |  |
Raw material | 899 | 527
Work in progress | 12,309 | 14,173
Finished goods | 4,158 | 4,097
Spare parts | 2,921 | 2,618
Inventory, Net, Total | $ 20,287 | $ 21,415

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