Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

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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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_PartnersCapitalAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Monetary value of the issuance of new units of limited partnership interest in a public offering.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of equity issuable under a continuous offering program.

+ References

No definition available.

+ Details

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Namespace Prefix:	vlp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Continuous Offering Program Remaining Amount of Equity Issuable (ATM Program)

+ References

No definition available.

+ Details

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Namespace Prefix:	vlp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_MajorityShareholderMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=vlp_PublicOfferingMember
Namespace Prefix:
Data Type:	na
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Period Type:

Partners' Capital, ATM Program's Narrative (Details) - USD ($)	6 Months Ended		22 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Sep. 16, 2016
Partners’ capital:
Proceeds from common units issued, gross	$ 5,000	$ 34,253,000
Majority Shareholder [Member]
Partners’ capital:
General partner ownership interest (percent)	2.00%
Public Offering [Member]
Partners’ capital:
Aggregate offering price of common units				$ 350,000,000
Proceeds from common units issued, gross			$ 45,500,000
Equity remaining available for issuance	$ 304,500,000		$ 304,500,000