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Commitments and Contingencies - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2010 USD ($) $ / a $ / t | Dec. 31, 2016 USD ($) | Nov. 30, 2016 USD ($) | Mar. 31, 2015 USD ($) | Jul. 31, 2014 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) LetterOfCredit | Dec. 31, 2014 USD ($) | Nov. 01, 2016 Railcar | Oct. 31, 2016 Railcar
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Expenses related to operating leases and rental agreements |  |  |  |  |  | $ 1,765,000 | $ 1,316,000 | $ 5,202,000 | $ 3,124,000 | $ 4,098,000 | $ 2,530,000 |  |
Customers in Conjunction with Bankruptcy Proceedings |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue recognized |  |  |  |  |  |  |  | 4,969,000 |  |  |  |  |
Consulting Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reimbursed out-of-pocket and other expenses | $ 10,000 |  |  |  |  |  |  |  |  |  |  |  |
Closing fee per acre | $ / a | 1 |  |  |  |  |  |  |  |  |  |  |  |
Consulting fees, expenses reimbursements and closing costs |  |  |  |  |  | 0 | 0 | 0 | 841,000 | 841,000 | 206,000 |  |
Tonnage fees per ton | $ / t | 0.50 |  |  |  |  |  |  |  |  |  |  |  |
Tonnage fees incurred |  |  |  |  |  | 71,000 | $ 46,000 | 169,000 | $ 213,000 | 252,000 | $ 332,000 |  |
Consulting Agreement | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Tonnage fees |  |  |  |  |  |  |  | $ 200,000 |  | 200,000 |  |  |
WISCONSIN |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  |  |  |  |  |  |  |  | $ 770,000 |  |  |
Number of letter of credit | LetterOfCredit |  |  |  |  |  |  |  |  |  | 2 |  |  |
Letter of credit |  |  |  | $ 2,132,000 | $ 1,254,000 |  |  |  |  |  |  |  |
Employment Agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements renewal period |  |  |  |  |  |  |  | 1 year |  | 1 year |  |  |
Commitments under employment agreement |  |  |  |  |  | 1,175,000 |  | $ 1,175,000 |  | $ 1,175,000 |  |  |
Agreement expiration date |  |  |  |  |  |  |  | 2017-05 |  | 2017-05 |  |  |
Performance Bond | Jackson County, Wisconsin |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Bond, carrying value |  |  |  |  |  | 4,400,000 |  | $ 4,400,000 |  | $ 4,400,000 |  |  |
Permit bond | Town of Curran, Wisconsin |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Bond, carrying value |  |  |  |  |  | $ 1,000,000 |  | $ 1,000,000 |  | $ 1,000,000 |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of rail cars | Railcar |  |  |  |  |  |  |  |  |  |  |  | 30 | 50
Subsequent Event | Customers in Conjunction with Bankruptcy Proceedings |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured bankruptcy claim granted |  |  | $ 12,000,000 |  |  |  |  |  |  |  |  |  |
Purchase of unsecured bankruptcy claim by third party |  | $ 6,600,000 |  |  |  |  |  |  |  |  |  |  |

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