Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment information
Segment revenue	$ 525,119	$ 395,421	$ 1,041,562	$ 768,879
Purchased product costs	215,824	155,359	427,388	307,916
Facility expenses	83,545	62,797	167,250	122,307
Income from operations	55,626	140,022	127,627	203,685
Capital expenditures			1,275,323	1,435,084
Unallocated Segment
Segment information
Portion of operating income attributable to non-controlling interests	4,184	(1,090)	7,319	(2,365)
Capital expenditures			8,906	4,900
Elimination
Segment information
Segment revenue	(900)		(2,471)
Net operating margin	(900)		(2,471)
Facility expenses	(900)		(2,471)
Total
Segment information
Segment revenue	528,577	396,858	1,046,514	771,680
Purchased product costs	215,860	155,359	427,424	307,916
Net operating margin	312,717	241,499	619,090	463,764
Facility expenses	87,892	65,117	173,282	126,929
Portion of operating income attributable to non-controlling interests	4,693	(1,090)	7,828	(2,365)
Income from operations	220,132	177,472	437,980	339,200
Capital expenditures			1,306,430	1,430,184
Marcellus | Total segments
Segment information
Segment revenue	183,734	120,057	358,893	228,554
Purchased product costs	39,710	16,993	74,000	35,786
Net operating margin	144,024	103,064	284,893	192,768
Facility expenses	33,755	22,272	69,228	44,908
Income from operations	110,269	80,792	215,665	147,860
Capital expenditures			792,927	729,040
Utica Segment | Ohio Gathering
Segment information
Capital expenditures			(40,013)
Utica Segment | Total segments
Segment information
Segment revenue	30,826	3,594	54,592	4,217
Purchased product costs	7,353		11,488
Net operating margin	23,473	3,594	43,104	4,217
Facility expenses	12,174	6,412	24,026	10,374
Portion of operating income attributable to non-controlling interests	4,687	(1,143)	7,823	(2,482)
Income from operations	6,612	(1,675)	11,255	(3,675)
Capital expenditures			433,615	640,819
Northeast Segment | Total segments
Segment information
Segment revenue	43,777	45,365	105,030	102,701
Purchased product costs	15,169	15,126	35,624	34,788
Net operating margin	28,608	30,239	69,406	67,913
Facility expenses	8,509	6,655	15,623	13,179
Income from operations	20,099	23,584	53,783	54,734
Capital expenditures			1,300	2,509
Southwest Segment | Total segments
Segment information
Segment revenue	271,140	227,842	530,470	436,208
Purchased product costs	153,628	123,240	306,312	237,342
Net operating margin	117,512	104,602	224,158	198,866
Facility expenses	34,354	29,778	66,876	58,468
Portion of operating income attributable to non-controlling interests	6	53	5	117
Income from operations	83,152	74,771	157,277	140,281
Capital expenditures			$ 78,588	$ 57,816