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Commitments and Contingencies - Additional Information (Detail) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 01, 2010 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) $ / Ton | Sep. 30, 2017 USD ($) | Jul. 31, 2016 USD ($) | Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Expenses related to operating leases and rental agreements |  | $ 3,965,000 | $ 2,677,000 | $ 10,658,000 | $ 6,744,000 |  |
Capital required as well as future expansion projects |  | 23,000,000 |  | 23,000,000 |  |  |
Restricted cash |  | 0 |  | 0 |  |  | $ 487,000
Permit bond |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Bond, carrying value |  | 1,350,000 |  | 1,350,000 |  |  |
Jackson County, Wisconsin | Performance Bond |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Bond, carrying value |  | 4,400,000 |  | 4,400,000 |  |  |
Monroe County, Wisconsin | Performance Bond |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Bond, carrying value |  | 900,000 |  | 900,000 |  |  |
Pipeline Common Carrier | Performance Bond |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Bond, carrying value |  | 1,943,000 |  | 1,943,000 |  |  |
Restricted cash |  | 0 |  | 0 |  |  | $ 487,000
Consulting Agreement |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Closing fee per acre | $ 1,000 |  |  |  |  |  |
Consulting fees expenses reimbursements and closing cost |  | 0 | 0 | $ 60,000 | 19,000 |  |
Tonnage fees per ton | $ / Ton |  |  |  | 0.5 |  |  |
Tonnage fees incurred |  | $ 225,000 | $ 133,000 | $ 593,000 | $ 362,000 |  |
Consulting Agreement | Minimum |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Tonnage fees |  |  |  |  |  | $ 200,000 |

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