Inventory - Schedule of Inventories (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Inventory [Line Items]
Inventory, Net, Total	$ 17,546	$ 19,136
Sand
Inventory [Line Items]
Raw material	463	428
Work in progress	7,549	10,465
Finished goods	5,703	4,400
Spare parts	3,831	3,843
Inventory, Net, Total	$ 17,546	$ 19,136

Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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