Unrecognized cost of unvested share-based compensation awards.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Total change in each class of partners' capital accounts during the year due to unit-based compensation. All partners include general, limited and preferred partners.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

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- References

No definition available.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- Definition

Net number of non-option equity instruments granted to participants.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of vesting of share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Number of non-employee directors on the entity's board of directors.

+ References

No definition available.

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- Definition

Date the equity-based award vests, in CCYY-MM-DD format.

+ References

No definition available.

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Unit-based Compensation (Details)				12 Months Ended
Unit-based Compensation (Details)	Jan. 14, 2016 independent_directors $ / shares shares	Jan. 08, 2015 independent_directors shares	Jan. 20, 2014 independent_directors shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares
Nonvested Restricted Units Rollforward
Nonvested restricted units, beginning balance				5,208
Restricted units, granted				4,443
Nonvested restricted units, ending balance				9,651	5,208
Nonvested Restricted Units Weighted Average Grant Date Fair Value Rollforward
Weighted average grant date fair value, beginning balance \| $ / shares				$ 34.575
Weighted-average grant date fair value, granted \| $ / shares				40.535
Weighted average grant date fair value, ending balance \| $ / shares				$ 37.319	$ 34.575
Unit-based Compensation (Textual)
Restricted units granted in period				4,443
Number of non-employee directors \| independent_directors		3	3
Weighted-average grant date fair value, granted \| $ / shares				$ 40.535
Unit-based compensation \| $				$ 173,000	$ 68,000
Weighted average period of recognition for unrecognized compensation costs on nonvested units		33.00%
Subsequent Event [Member]
Nonvested Restricted Units Weighted Average Grant Date Fair Value Rollforward
Weighted-average grant date fair value, granted \| $ / shares	$ 45.34
Unit-based Compensation (Textual)
Number of non-employee directors \| independent_directors	3
Weighted-average grant date fair value, granted \| $ / shares	$ 45.34
Weighted average period of recognition for unrecognized compensation costs on nonvested units	33.00%
VLP 2013 Incentive Compensation Plan [Member] \| Stock Compensation Plan [Member]
Unit-based Compensation (Textual)
Number of common units available to be awarded under incentive compensation plans				2,990,349
VLP 2013 Incentive Compensation Plan [Member] \| Restricted Unit [Member]
Nonvested Restricted Units Rollforward
Restricted units, granted		4,443	5,208
Unit-based Compensation (Textual)
Restricted units granted in period		4,443	5,208
Vesting date, restricted units under 2013 ICP				Jan. 20, 2017
Unrecognized unit-based compensation cost related to outstanding unvested units \| $				$ 256,000
Weighted average period of recognition for unrecognized compensation costs on nonvested units				2 years
VLP 2013 Incentive Compensation Plan [Member] \| Restricted Unit [Member] \| Subsequent Event [Member]
Nonvested Restricted Units Rollforward
Restricted units, granted	5,958
Unit-based Compensation (Textual)
Restricted units granted in period	5,958
VLP 2013 Incentive Compensation Plan [Member] \| Restricted Stock - Independent Director [Member]
Nonvested Restricted Units Rollforward
Restricted units, granted		1,481	1,736
Unit-based Compensation (Textual)
Restricted units granted in period		1,481	1,736
VLP 2013 Incentive Compensation Plan [Member] \| Restricted Stock - Independent Director [Member] \| Subsequent Event [Member]
Nonvested Restricted Units Rollforward
Restricted units, granted	1,986
Unit-based Compensation (Textual)
Restricted units granted in period	1,986
VLP 2013 Incentive Compensation Plan [Member] \| Distribution Equivalent Rights (DER) [Member]
Unit-based Compensation (Textual)
Distribution equivalent rights (DERs) granted in period		4,443	5,208
VLP 2013 Incentive Compensation Plan [Member] \| Distribution Equivalent Rights (DER) [Member] \| Subsequent Event [Member]
Unit-based Compensation (Textual)
Distribution equivalent rights (DERs) granted in period	5,958
VLP 2013 Incentive Compensation Plan [Member] \| Distribution Equivalent Rights (DER) - Independent Director [Member]
Unit-based Compensation (Textual)
Distribution equivalent rights (DERs) granted in period		1,481	1,736
VLP 2013 Incentive Compensation Plan [Member] \| Distribution Equivalent Rights (DER) - Independent Director [Member] \| Subsequent Event [Member]
Unit-based Compensation (Textual)
Distribution equivalent rights (DERs) granted in period	1,986