Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	7 Months Ended	12 Months Ended	5 Months Ended	12 Months Ended
	Dec. 31, 2010 Successor [Member]	Dec. 31, 2011 Successor [Member]	May 25, 2010 Predecessor [Member]	Dec. 31, 2009 Predecessor [Member]
REVENUES:
Gas sales, including related party amounts of $22,715, $3,298, $0, and $0	$ 291,247	$ 455,746	$ 228,097	$ 476,077
NGL sales, including related party amounts of $364,906, $136,960, $0, and $0	238,076	603,219	152,803	239,255
Gathering, transportation and other fees, including related party amounts of $23,716, $14,004, $12,200, and $11,162	178,769	350,745	114,526	270,071
Net realized and unrealized (loss) gain from derivatives	(7,866)	(19,214)	(716)	37,712
Other, including related party amounts of $9,799, $2,725, $0, and $0	16,387	43,402	10,340	20,162
Total revenues	716,613	1,433,898	505,050	1,043,277
OPERATING COSTS AND EXPENSES:
Cost of sales, including related party amounts of $21,957, $12,998, $6,564, and $10,913	504,327	1,012,826	357,778	674,944
Operation and maintenance	77,808	147,643	47,842	117,080
General and administrative, including related party amounts of $16,579, $5,833, $0, and $0	43,739	67,408	37,212	57,863
(Gain) loss on asset sales, net	213	(2,372)	303	(133,282)
Depreciation and amortization	75,967	168,684	41,784	100,098
Total operating costs and expenses	702,054	1,394,189	484,919	816,703
OPERATING INCOME	14,559	39,709	20,131	226,574
Income from unconsolidated affiliates	53,493	119,540	15,872	7,886
Interest expense, net	(48,251)	(102,474)	(34,541)	(77,665)
Loss on debt refinancing, net	(15,748)	0	(1,780)	0
Other income and deductions, net	(8,229)	17,309	(3,897)	(15,132)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(4,176)	74,084	(4,215)	141,663
Income tax expense (benefit)	552	465	404	(1,095)
INCOME (LOSS) FROM CONTINUING OPERATIONS	(4,728)	73,619	(4,619)	142,758
DISCONTINUED OPERATIONS:
Net (loss) income from operations of east Texas assets, including loss on disposal of $55 in 2010	(1,244)	0	(327)	(2,269)
NET INCOME (LOSS)	(5,972)	73,619	(4,946)	140,489
Net income attributable to noncontrolling interest	(156)	(1,177)	(406)	(91)
NET INCOME (LOSS) ATTRIBUTABLE TO REGENCY ENERGY PARTNERS LP	(6,128)	72,442	(5,352)	140,398
Amounts attributable to Series A Preferred Units	4,651	7,982	3,336	3,995
General partner's interest, including IDRs	2,800	7,010	662	5,252
Amount allocated to non-vested common units	0	0	(79)	965
Beneficial conversion feature for Class D common units	0	0	0	820
Limited partners' interest in net income (loss)	(13,579)	57,450	(9,271)	129,366
Basic and diluted income (loss) from continuing operations per unit:
Amount allocated to common units	(12,359)	57,450	(8,966)	131,752
Weighted average number of common units outstanding	130,619,554	145,490,869	92,788,319	80,582,705
Basic income (loss) from continuing operations per common unit	$ (0.09)	$ 0.39	$ (0.10)	$ 1.63
Diluted income (loss) from continuing operations per common unit	$ (0.09)	$ 0.32	$ (0.10)	$ 1.63
Distributions per unit	$ 0.89	$ 1.81	$ 0.89	$ 1.78
Basic and diluted loss on discontinued operations per unit	$ (0.01)	$ 0.00	$ 0.00	$ (0.03)
Basic and diluted net income (loss) per unit:
Amount allocated to common units	(13,579)	57,450	(9,271)	129,366
Basic net income (loss) per common unit	$ (0.10)	$ 0.39	$ (0.10)	$ 1.61
Diluted net income (loss) per common unit	$ (0.10)	$ 0.32	$ (0.10)	$ 1.60
Amount allocated to Class D common units	$ 0	$ 0	$ 0	$ 820
Total number of Class D common units outstanding	0	0	0	7,276,506
Income per Class D common unit due to beneficial conversion feature	$ 0.00	$ 0.00	$ 0.00	$ 0.11
Distributions paid per unit	$ 0.00	$ 0.00	$ 0.00	$ 0.00