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Commitments and Contingencies - Additional Information (Detail) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2010 $ / a | Mar. 31, 2017 USD ($) $ / t | Mar. 31, 2016 USD ($) | Jul. 31, 2016 USD ($) | Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |
Expenses related to operating leases and rental agreements |  | $ 1,975,000 | $ 1,805,000 |  |
Restricted cash |  | 972,000 |  |  | $ 971,000
Consulting Agreement |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Closing fee per acre | $ / a | 1 |  |  |  |
Reimbursed out-of-pocket and other expenses |  | $ 0 | 3,000 |  |
Tonnage fees per ton | $ / t |  | 0.50 |  |  |
Tonnage fees incurred |  | $ 117,000 | $ 45,000 |  |
Consulting Agreement | Minimum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Tonnage fees |  |  |  | $ 200,000 |
Employment Agreements |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Agreements renewal period |  | 1 year |  |  |
Commitments under employment agreement |  | $ 1,250,000 |  |  |
Agreement expiration date |  | 2017-05 |  |  |
Performance Bond | Jackson County, Wisconsin |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Bond, carrying value |  | $ 4,400,000 |  |  |
Performance Bond | Monroe County, Wisconsin |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Bond, carrying value |  | 900,000 |  |  |
Performance Bond | Pipeline Common Carrier [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Bond, carrying value |  | 1,943,000 |  |  |
Restricted cash |  | 972,000 |  |  | $ 971,000
Permit bond |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Bond, carrying value |  | $ 1,350,000 |  |  |

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