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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, 2016 USD ($) $ / t	Jul. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Loss Contingencies [Line Items]
Expenses related to operating leases and rental agreements				$ 7,065,000		$ 4,098,000	$ 2,530,000
Restricted cash		$ 971,000		971,000		0
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		841,000	206,000
Tonnage fees per ton \| $ / t				0.50
Tonnage fees incurred				$ 258,000		$ 252,000	$ 332,000
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		1,175,000		$ 1,175,000
Agreement expiration date				2017-05
Performance Bond \| Jackson County, Wisconsin
Loss Contingencies [Line Items]
Bond, carrying value		4,400,000		$ 4,400,000
Performance Bond \| Monroe County, Wisconsin
Loss Contingencies [Line Items]
Bond, carrying value		900,000		900,000
Performance Bond \| Pipeline Common Carrier [Member]
Loss Contingencies [Line Items]
Bond, carrying value		1,943,000		1,943,000
Restricted cash		971,000		971,000
Permit bond \| Town of Curran, Wisconsin
Loss Contingencies [Line Items]
Bond, carrying value		1,000,000		$ 1,000,000
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