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Organization and Business - Additional Information (Detail) $ in Thousands, t in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2017 t
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Current annual nameplate processing capacity		3.3
Anticipated nameplate processing capacity upon completion of expansion		5.5
Correction resulted, increase in net income | $	$ 492

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- Definition

Anticipated nameplate processing capacity upon completion of expansion.

+ References

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- Definition

Current annual nameplate processing capacity.

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- Definition

Resulting effect of restatement to correct an error, after tax effects, on the net income of prior periods for the year in which any adjustments are first made. In statements containing more than one period, discloses the effects for each period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22658-107794

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22663-107794

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22644-107794

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