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Commitments and Contingencies - Narrative (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Expenses related to operating leases and rental agreements	$ 14,421,000	$ 10,239,000	$ 7,065,000
Restricted cash	0	487,000
Permit bond
Loss Contingencies [Line Items]
Bond, carrying value	1,350
Jackson County, Wisconsin | Performance Bond
Loss Contingencies [Line Items]
Bond, carrying value	4,400
Monroe County, Wisconsin | Performance Bond
Loss Contingencies [Line Items]
Bond, carrying value	900
Pipeline Common Carrier | Performance Bond
Loss Contingencies [Line Items]
Bond, carrying value	1,943
Restricted cash	$ 0	$ 487,000

X

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
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