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Net Income Per Unit - Narrative (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
General partner's ownership interest (as percent)	2.00%	2.00%	2.00%	2.00%
Quarterly distributions of available cash, minimum level (in dollars per share)			0.43125

X

- Definition

Minimum distribution per unit threshold to begin paying incentive distributions to general partner on a percentage scale, based on amounts in excess of distributions to Limited Partnership members or limited partners.

+ References

No definition available.

+ Details

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- References

No definition available.

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X

- Definition

Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

+ Details

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