Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Share data	3 Months Ended		4 Months Ended	9 Months Ended	4 Months Ended
	Sep. 30, 2011 Successor [Member]	Sep. 30, 2010 Successor [Member]	Sep. 30, 2010 Successor [Member]	Sep. 30, 2011 Successor [Member]	May 25, 2010 Predecessor [Member]
REVENUES:
Gas sales, including related party	$ 118,754	$ 132,130	$ 179,371	$ 361,641	$ 228,097
NGL sales including related party	174,537	91,489	117,529	430,876	152,803
Gathering, transportation and other fees, including related party	91,596	72,184	94,755	255,249	114,526
Net realized and unrealized loss from derivatives	(5,380)	(6,218)	(6,348)	(14,636)	(716)
Other, including related party	10,760	7,303	8,561	30,887	10,340
Total revenues	390,267	296,888	393,868	1,064,017	505,050
OPERATING COSTS AND EXPENSES:
Cost of sales, including related party	279,526	213,032	283,206	755,262	357,778
Operation and maintenance	37,950	34,306	44,708	105,506	47,842
General and administrative, including related party	17,350	18,072	25,176	54,010	37,212
(Gain) loss on asset sales, net	(131)	200	210	50	303
Depreciation and amortization	41,956	32,205	42,750	122,695	41,784
Total operating costs and expenses	376,651	297,815	396,050	1,037,523	484,919
OPERATING INCOME (LOSS):	13,616	(927)	(2,182)	26,494	20,131
Income from unconsolidated affiliates	30,946	21,754	29,875	86,921	15,872
Interest expense, net	(28,852)	(20,379)	(28,460)	(73,548)	(36,321)
Other income and deductions, net	15,050	7,524	4,003	20,105	(3,897)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	30,760	7,972	3,236	59,972	(4,215)
Income tax (benefit) expense	(89)	450	695	(19)	404
INCOME (LOSS) FROM CONTINUING OPERATIONS	30,849	7,522	2,541	59,991	(4,619)
DISCONTINUED OPERATIONS:
Net income (loss) from operations of east Texas assets	0	324	410	0	(327)
NET INCOME (LOSS)	30,849	7,846	2,951	59,991	(4,946)
Net income attributable to noncontrolling interest	(549)	(58)	(87)	(1,073)	(406)
NET INCOME (LOSS) ATTRIBUTABLE TO REGENCY ENERGY PARTNERS LP	30,300	7,788	2,864	58,918	(5,352)
Amounts attributable to Series A Preferred Units	1,997	1,991	2,659	5,985	3,336
General partner's interest, including IDRs	2,060	1,166	1,969	4,902	662
Amount allocated to non-vested common units			0	0	(79)
Limited partners' interest in net income (loss)	26,243	4,631	(1,764)	48,031	(9,271)
Income (loss) from continuing operations per common unit:
Amount allocated to common units	26,243	4,314	(2,165)	48,031	(8,966)
Weighted average number of common units outstanding	145,842,735	128,387,929	125,916,507	142,058,631	92,788,319
Basic income (loss) from continuing operations per common unit	$ 0.18	$ 0.03	$ (0.02)	$ 0.34	$ (0.10)
Diluted income (loss) from continuing operations per common unit	$ 0.09	$ 0.03	$ (0.02)	$ 0.23	$ (0.10)
Distributions per unit	$ 0.455	$ 0.445	$ 0.445	$ 1.35	$ 0.89
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic and Diluted Share	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Basic and diluted net income (loss) per common unit:
Amount allocated to common units	$ 26,243	$ 4,631	$ (1,764)	$ 48,031	$ (9,271)
Basic net income per common unit	$ 0.18	$ 0.04	$ (0.01)	$ 0.34	$ (0.10)
Diluted net income per common unit	$ 0.09	$ 0.04	$ (0.01)	$ 0.23	$ (0.10)