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Commitments and Contingencies - Additional Information (Detail) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2010 USD ($) $ / a | Dec. 31, 2016 USD ($) | Nov. 30, 2016 USD ($) | Dec. 31, 2017 USD ($) $ / t | Dec. 31, 2016 USD ($) | Jul. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Expenses related to operating leases and rental agreements |  |  |  | $ 10,239,000 | $ 7,065,000 |  | $ 4,098,000
Capital requirements for Oakdale facility as well as future expansion projects |  |  |  | 35,100,000 |  |  |
Restricted cash |  | $ 971,000 |  | 487,000 | 971,000 |  |
Permit bond |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Bond, carrying value |  |  |  | 1,350,000 |  |  |
Jackson County, Wisconsin | Performance Bond |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Bond, carrying value |  |  |  | 4,400,000 |  |  |
Monroe County, Wisconsin | Performance Bond |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Bond, carrying value |  |  |  | 900,000 |  |  |
Pipeline Common Carrier [Member] | Performance Bond |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Bond, carrying value |  |  |  | 1,943,000 |  |  |
Restricted cash |  | 971,000 |  | 487,000 | 971,000 |  |
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 |  |  |  | $ 19,000 | 0 |  | 841,000
Tonnage fees per ton | $ / t |  |  |  | 0.50 |  |  |
Tonnage fees incurred |  |  |  | $ 530,000 | $ 258,000 |  | $ 252,000
Consulting Agreement | Minimum |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Tonnage fees |  |  |  |  |  | $ 200,000 |
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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