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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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The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action.

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