Financial Information by Business Segment (Details) (USD $)	0 Months Ended	3 Months Ended		6 Months Ended
	May 07, 2014	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 item	Jun. 30, 2013
Financial Information by Business Segment
Number of operating segments				2
Operating segments information
Revenues from external customers		$ 526,168,000	$ 473,093,000	$ 1,187,793,000	$ 888,976,000
Operating income		224,771,000	161,980,000	581,562,000	306,459,000
Reconciliation of operating income to income from continuing operations:
Other income		2,579,000	2,041,000	5,130,000	4,322,000
Interest expense		31,873,000	37,384,000	63,841,000	75,136,000
Income taxes		59,089,000	38,078,000	175,424,000	72,846,000
Income from continuing operations		136,388,000	88,559,000	347,427,000	162,799,000
Depreciation, depletion and amortization		157,219,000	162,473,000	309,330,000	305,509,000
Expenditure for segment assets		1,041,943,000	485,323,000	1,534,047,000	777,990,000
Cash capital expenditures	157,300,000			157,256,000
Non-cash capital expenditures		3,600,000	5,900,000	8,100,000	11,900,000
Operating segments | EQT Production
Operating segments information
Revenues from external customers		322,100,000	306,132,000	789,845,000	556,643,000
Operating income		144,689,000	105,056,000	421,894,000	179,153,000
Reconciliation of operating income to income from continuing operations:
Gain on sale / exchange of assets		31,000,000		31,000,000
Depreciation, depletion and amortization		136,251,000	144,073,000	267,490,000	268,982,000
Expenditure for segment assets		930,228,000	394,391,000	1,338,559,000	637,566,000
Cash capital expenditures		157,300,000		157,300,000
Non-cash capital expenditures		353,000,000		353,000,000
Expenditures for segment assets for property acquisitions		550,500,000	128,900,000	609,700,000	141,600,000
Operating segments | EQT Midstream
Operating segments information
Revenues from external customers		162,345,000	150,366,000	328,571,000	297,054,000
Operating income		88,527,000	72,246,000	171,596,000	146,460,000
Reconciliation of operating income to income from continuing operations:
Gain on sale / exchange of assets		6,800,000		6,800,000
Depreciation, depletion and amortization		21,130,000	18,452,000	42,139,000	36,671,000
Expenditure for segment assets		110,913,000	89,060,000	194,126,000	138,204,000
Less intersegment revenues, net
Operating segments information
Revenues from external customers		(9,709,000)	(18,232,000)	(26,684,000)	(35,289,000)
Less intersegment revenues, net | EQT Midstream
Reconciliation of operating income to income from continuing operations:
Intercompany eliminations for transmission and storage services			9,100,000		20,000,000
Third-party transportation and processing costs
Operating segments information
Revenues from external customers		51,432,000	34,827,000	96,061,000	70,568,000
Unallocated expenses and Other
Operating segments information
Operating income		(8,445,000)	(15,322,000)	(11,928,000)	(19,154,000)
Reconciliation of operating income to income from continuing operations:
Depreciation, depletion and amortization		(162,000)	(52,000)	(299,000)	(144,000)
Expenditure for segment assets		$ 802,000	$ 1,872,000	$ 1,362,000	$ 2,220,000