Fair Value Measures Significant Unobservable Inputs for FV Estimation of Embedded Derivatives (Details)	Sep. 30, 2013
Fair Value Measures [Abstract]
Fair Value, Embedded Derivatives Significant Unobservable Input, Credit Spread	6.39%
Fair Value, Embedded Derivatives Significant Unobservable Input, Volatility	19.96%

The estimated midpoint between the option adjusted spreads (OAS) of the Company's traded bonds and the Company's cost of equity after subtracting the risk free rate.

No definition available.

Name:	rgp_FairValueEmbeddedDerivativesSignificantUnobservableInputCreditSprea
Namespace Prefix:	rgp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant