Financial Information by Business Segment - Schedule of Depreciation, Amortization, and Expenditures (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Depreciation, depletion and amortization:
Depreciation, depletion and amortization	$ 224,629	$ 196,819	$ 445,860	$ 391,564
Expenditures for segment assets:
Expenditures for segment assets	439,429	685,573	812,975	1,241,015
Expenditures for property acquisitions			821,738	1,321,002
Operating Segments | EQT Production
Depreciation, depletion and amortization:
Depreciation, depletion and amortization	197,864	173,331	392,700	344,794
Expenditures for segment assets:
Expenditures for segment assets	237,043	520,315	468,656	1,002,289
Expenditures for property acquisitions	34,800	88,100	68,100	139,100
Operating Segments | EQT Midstream
Depreciation, depletion and amortization:
Depreciation, depletion and amortization	26,678	23,393	53,011	46,588
Expenditures for segment assets:
Expenditures for segment assets	201,211	164,542	342,131	237,117
Other
Depreciation, depletion and amortization:
Depreciation, depletion and amortization	87	95	149	182
Expenditures for segment assets:
Expenditures for segment assets	$ 1,175	$ 716	$ 2,188	$ 1,609