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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017 USD ($) Customer Segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Significant Accounting Policies [Line Items] |  |  |
Number of customers with supply agreement | Customer | 6 |  |
Agreements expiring period | 2019 |  |
Agreements expiring period | 2020 |  |
Railcar revenue recognized | $ 7,702,000 | $ 5,732,000 | $ 3,543,000
Reservation revenue recognized | 30,000,000 | 15,041,000 | 1,000,000
Revenue generated from transportation | 48,066,000 | 480,000 | 2,294,000
Amount related to minimum commitments under customer contracts due or payable | $ 0 | 0 | 0
Accounts receivables due period | 30 days |  |
Accounts receivables, allowance for doubtful accounts |  | 0 |
Deferred revenue balance | $ 0 | 1,615,000 |
Cost of goods sold generated from shipping | 50,313,000 | 1,172,000 | 2,257,000
Inventory write-down | 0 | 0 |
Debt, face amount | 1,372,000 | 1,178,000 |
Amortization of deferred financing cost | 455,000 | 159,000 | 251,000
Accretion expense of debt discount | 0 | 263,000 | 519,000
Tax benefit due to re-measurement of deferred tax assets and liabilities as a result of Tax Reform Act | 8,500,000 |  |
Recognized income tax interest and penalties | 0 |  |
Probable environmental matters | $ 0 | 0 |
Number of operating segment | Segment | 1 |  |
Deferred revenue recognized included in contract liability | $ 1,615,000 |  |
Remaining revenue performance obligation, percentage of revenue expected to be recognized remainder of 2018 | 42.00% |  |
Remaining revenue performance obligation, percentage of revenue expected to be recognized by 2021 | 58.00% |  |
Percentage of revenue from sand sales recognized either upon shipment or delivery | 37.00% |  |
Percentage of revenue from reservation charges recognized when right of use expires | 22.00% |  |
Percentage of revenue from shortfall recognized when right of use expires | 1.00% |  |
Percentage of revenue from railcar rental recognized upon shipment | 5.00% |  |
Percentage of revenue from transportation recognized upon shipment | 35.00% |  |
Revolving Credit Facility |  |  |
Significant Accounting Policies [Line Items] |  |  |
Long-term Line of Credit | $ 0 | 0 |
Unbilled Revenues [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Deferred revenue |  | 0 |
Take-or-pay Contracts [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Revenue recognized for shortfall payments relating to minimum commitments | 1,244,000 | $ 20,902,000 | $ 10,095,000
Legal costs capitalized | 0 |  |
Amortization costs incurred to obtain contract | 0 |  |
Impairment loss incurred to obtain contract | $ 0 |  |

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