Financial Information by Business Segment - Schedule of Depreciation, Amortization, and Expenditures (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended
		Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Operating segments information
Depreciation, depletion and amortization			$ 196,819	$ 157,219	$ 391,564	$ 309,330
Expenditures for segment assets			685,573	1,045,570	1,241,015	1,542,133
Capital expenditures associated with Range asset exchange		$ 167,300		157,300	0	157,256
Non-cash capital expenditures for the exchange of assets with Range				353,000		353,000
Operating Segments | EQT Production
Operating segments information
Depreciation, depletion and amortization			173,331	136,251	344,794	267,490
Expenditures for segment assets	[1]		520,315	932,463	1,002,289	1,343,547
Expenditures for property acquisitions			88,100	550,500	139,100	609,700
Operating Segments | EQT Midstream
Operating segments information
Depreciation, depletion and amortization			23,393	21,130	46,588	42,139
Expenditures for segment assets			164,542	112,305	237,117	197,224
Other
Operating segments information
Depreciation, depletion and amortization			95	(162)	182	(299)
Expenditures for segment assets			$ 716	$ 802	$ 1,609	$ 1,362

[1] Includes $157.3 million of cash capital expenditures and $353.0 million of non-cash capital expenditures for the exchange of assets with Range Resources Corporation (described in Note L) for the three and six months ended June 30, 2014. Expenditures for segment assets in the EQT Production segment include $88.1 million and $550.5 million for property acquisitions during the three months ended June 30, 2015 and 2014, respectively, and $139.1 million and $609.7 million for property acquisitions during the six months ended June 30, 2015 and 2014, respectively.