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Net Income Per Unit - Narrative (Details) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
General partner's ownership interest (as percent)	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.

+ Details

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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://www.xbrl.org/2003/role/presentationRef
-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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