Segment Information (Amounts Related To Balance Sheets For Each Segment) (Details) (USD $) In Thousands, unless otherwise specified			7 Months Ended	12 Months Ended	5 Months Ended	12 Months Ended			7 Months Ended	12 Months Ended	5 Months Ended	12 Months Ended			7 Months Ended	12 Months Ended	5 Months Ended	12 Months Ended			7 Months Ended	12 Months Ended	5 Months Ended	12 Months Ended			7 Months Ended	12 Months Ended	5 Months Ended	12 Months Ended			7 Months Ended	12 Months Ended	5 Months Ended	12 Months Ended			7 Months Ended	12 Months Ended	5 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2010 Successor [Member]	Dec. 31, 2011 Successor [Member]	May 25, 2010 Predecessor [Member]	Dec. 31, 2009 Predecessor [Member]	Dec. 31, 2011 Gathering And Processing [Member]	Dec. 31, 2010 Gathering And Processing [Member]	Dec. 31, 2010 Gathering And Processing [Member] Successor [Member]	Dec. 31, 2011 Gathering And Processing [Member] Successor [Member]	May 25, 2010 Gathering And Processing [Member] Predecessor [Member]	Dec. 31, 2009 Gathering And Processing [Member] Predecessor [Member]	Dec. 31, 2011 Corporate Joint Venture [Member]	Dec. 31, 2010 Corporate Joint Venture [Member]	Dec. 31, 2010 Corporate Joint Venture [Member] Successor [Member]	Dec. 31, 2011 Corporate Joint Venture [Member] Successor [Member]	May 25, 2010 Corporate Joint Venture [Member] Predecessor [Member]	Dec. 31, 2009 Corporate Joint Venture [Member] Predecessor [Member]	Dec. 31, 2011 Contract Compression [Member]	Dec. 31, 2010 Contract Compression [Member]	Dec. 31, 2010 Contract Compression [Member] Successor [Member]	Dec. 31, 2011 Contract Compression [Member] Successor [Member]	May 25, 2010 Contract Compression [Member] Predecessor [Member]	Dec. 31, 2009 Contract Compression [Member] Predecessor [Member]	Dec. 31, 2011 Contract Treating [Member]	Dec. 31, 2010 Contract Treating [Member]	Dec. 31, 2010 Contract Treating [Member] Successor [Member]	Dec. 31, 2011 Contract Treating [Member] Successor [Member]	May 25, 2010 Contract Treating [Member] Predecessor [Member]	Dec. 31, 2009 Contract Treating [Member] Predecessor [Member]	Dec. 31, 2011 Corporate And Others [Member]	Dec. 31, 2010 Corporate And Others [Member]	Dec. 31, 2010 Corporate And Others [Member] Successor [Member]	Dec. 31, 2011 Corporate And Others [Member] Successor [Member]	May 25, 2010 Corporate And Others [Member] Predecessor [Member]	Dec. 31, 2009 Corporate And Others [Member] Predecessor [Member]	Dec. 31, 2011 Eliminations [Member]	Dec. 31, 2010 Eliminations [Member]	Dec. 31, 2010 Eliminations [Member] Successor [Member]	Dec. 31, 2011 Eliminations [Member] Successor [Member]	May 25, 2010 Eliminations [Member] Predecessor [Member]	Dec. 31, 2009 Eliminations [Member] Predecessor [Member]
External Revenue			$ 716,613	$ 1,433,898	$ 505,050	$ 1,043,277			$ 606,944	$ 1,226,260	$ 438,804	$ 879,439			$ 0	$ 0	$ 0	$ 9,078			$ 86,099	$ 150,496	$ 58,971	$ 148,846			$ 13,662	$ 39,604	$ 0	$ 0			$ 9,908	$ 17,538	$ 7,275	$ 5,914			$ 0	$ 0	$ 0	$ 0
Intersegment Revenue			0	0	0	0			0	0	0	(8,755)			0	0	0	4,933			14,079	16,346	9,126	4,604			0	397	0	0			185	296	91	296			(14,264)	(17,039)	(9,217)	(1,078)
Cost of Sales			504,327	1,012,826	357,778	674,944			496,933	992,797	352,807	656,764			0	0	0	2,297			8,325	11,269	5,741	12,422			2,208	10,545	0	0			(2,954)	(1,450)	(679)	(65)			(185)	(335)	(91)	3,526
Total segment margin			212,286	421,072	147,272	368,333			110,011	233,463	85,997	213,920			0	0	0	11,714			91,853	155,573	62,356	141,028			11,454	29,456	0	0			13,047	19,284	8,045	6,275			(14,079)	(16,704)	(9,126)	(4,604)
Operation and maintenance			77,808	147,643	47,842	117,080			53,421	97,566	33,430	74,962			0	0	0	2,112			37,067	63,442	23,476	45,744			1,227	2,974	0	0			172	365	59	238			(14,079)	(16,704)	(9,123)	(5,976)
Depreciation and Amortization			75,967	168,684	41,784	100,098			45,547	87,377	25,422	59,654			0	0	0	2,448			25,771	65,201	15,560	36,548			3,684	12,325	0	0			965	3,781	802	1,448			0	0	0	0
Income from Unconsolidated Affiliates			53,493	119,540	15,872	7,886			0	0	0	0			53,493	119,540	15,872	7,886			0	0	0	0			0	0	0	0			0	0	0	0			0	0	0	0
Expenditures for Long-Lived Assets			159,223	406,339	63,787	193,083			93,398	280,199	43,666	84,097			0	0	0	22,367			44,316	112,338	18,418	83,707			18,106	7,445	0	0			3,403	6,357	1,703	2,912			0	0	0	0
Assets	5,567,856	4,770,204					1,959,697	1,724,682					1,924,705	1,351,256					1,405,600	1,411,325					215,172	220,584					62,682	62,357					0	0
Investment in unconsolidated affiliates	1,924,705	1,351,256					0	0					1,924,705	1,351,256					0	0					0	0					0	0					0	0
Goodwill	$ 789,789	$ 789,789					$ 313,361	$ 313,361					$ 0	$ 0					$ 476,428	$ 476,428					$ 0	$ 0					$ 0	$ 0					$ 0	$ 0