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

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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

The number of limited partner units outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section F

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

Number of stock or units eligible for distribution to members or limited partners of the limited liability company (LLC) or limited partnership (LP).

No definition available.

Name:	us-gaap_StockOrUnitsAvailableForDistributions
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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The total cash distribution payment made to Series A Preferred unitholders.

No definition available.

Name:	wgp_ConvertiblePreferredUnitsCashDistributions
Namespace Prefix:	wgp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The quarterly cash distribution payment per unit on Series A Preferred units.

No definition available.

Name:	wgp_ConvertiblePreferredUnitsDistributionsPerUnit
Namespace Prefix:	wgp_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Period used to calculate prorated quarterly distribution per unit.

No definition available.

Name:	wgp_NumberOfDaysInProratedPeriod
Namespace Prefix:	wgp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The number of days subsequent to each quarter the Partnership is required to make distributions to unitholders of record on the applicable record date.

No definition available.