Financial Information by Business Segment - Schedule of Depreciation, Amortization, and Expenditures (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Depreciation, depletion and amortization:
Depreciation, depletion and amortization	$ 240,817	$ 224,629	$ 472,735	$ 445,860
Expenditures for segment assets:
Expenditures for segment assets	542,374	439,429	1,559,687	812,975
Payments to acquire businesses, gross			811,207	0
Operating Segments | EQT Production
Depreciation, depletion and amortization:
Depreciation, depletion and amortization	219,211	208,809	430,308	414,485
Expenditures for segment assets:
Expenditures for segment assets	455,721	234,325	1,401,179	471,891
Consideration transferred	49,600	34,800	94,900	68,100
Payments to acquire businesses, gross	141,700		811,200
Capital expenditures incurred but not yet paid			9,700
Operating Segments | EQT Gathering
Depreciation, depletion and amortization:
Depreciation, depletion and amortization	9,555	7,594	18,415	14,857
Expenditures for segment assets:
Expenditures for segment assets	53,708	86,278	102,546	159,365
Operating Segments | EQT Transmission
Depreciation, depletion and amortization:
Depreciation, depletion and amortization	11,845	6,937	23,532	13,681
Expenditures for segment assets:
Expenditures for segment assets	29,978	115,946	51,367	176,017
Other
Depreciation, depletion and amortization:
Depreciation, depletion and amortization	206	1,289	480	2,837
Expenditures for segment assets:
Expenditures for segment assets	$ 2,967	$ 2,880	$ 4,595	$ 5,702