Fair Value Measures Significant Quantitative Unobservable Inputs for Embedded Derivative Fair Value (Details)	Mar. 31, 2012
Fair Value Measures [Abstract]
Fair Value, Embedded Derivatives Significant Unobservable Input, Credit Sprea	6.89%
Fair Value, Embedded Derivatives Significant Unobservable Input, Volatility	16.06%

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.

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