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Inventories - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Inventory [Line Items] |  |  |  |
Inventories wrote down |  |  | $ 8,492 | $ 9,382
Oil and Gas Proppants [Member] | Raw Materials and Material-in-Progress [Member] |  |  |  |
Inventory [Line Items] |  |  |  |
Inventories wrote down | $ 7,700 | $ 9,400 |  |
Oil and Gas Proppants [Member] | Frac Sand [Member] |  |  |  |
Inventory [Line Items] |  |  |  |
Inventories wrote down | $ 800 |  |  |

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