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Inventories - Schedule of Inventories (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Inventory [Line Items] |  |
Total inventory | $ 12,381 | $ 18,575
Sand |  |
Inventory [Line Items] |  |
Raw material | 628 | 1,201
Work in progress | 6,067 | 10,070
Finished goods | 4,769 | 4,648
Spare parts | 917 | 1,356
Total inventory | $ 12,381 | $ 17,275

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