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Overview - Additional Information (Detail) - segment	12 Months Ended
	Dec. 31, 2017	Mar. 01, 2016	Feb. 29, 2016	Jul. 31, 2015	Jul. 30, 2015	May 29, 2015	May 28, 2015
Operating segments	3
Laramie Energy Company
Ownership of Laramie Energy, LLC	42.30%	42.30%	32.40%	32.40%	34.00%	34.00%	33.34%

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

No definition available.

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