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Partners' Capital and Distributions Unit Activity (Details)
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Common Units [Member]    
Capital Unit [Line Items]    
Limited Partners' Capital Account, Units Outstanding 410,943,257us-gaap_PartnersCapitalAccountUnits
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_CapitalUnitsMember		 409,406,482us-gaap_PartnersCapitalAccountUnits
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_CapitalUnitsMember
Issuance of common units under LTIP, net of forfeitures and tax withholding 20,098rgp_StockIssuedDuringPeriodSharesSharebasedCompensationNetofForfeituresNetofTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_CapitalUnitsMember		  
Issuance of common units under the equity distribution agreement 1,516,677us-gaap_StockIssuedDuringPeriodSharesIssuedForCash
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_CapitalUnitsMember		  
Class F Units [Member]    
Capital Unit [Line Items]    
Limited Partners' Capital Account, Units Outstanding 6,274,483us-gaap_PartnersCapitalAccountUnits
/ us-gaap_PartnerCapitalComponentsAxis
= rgp_ClassFUnitsMember		 6,274,483us-gaap_PartnersCapitalAccountUnits
/ us-gaap_PartnerCapitalComponentsAxis
= rgp_ClassFUnitsMember