Financial Information by Business Segment - Schedule of Depreciation, Amortization, and Expenditures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Depreciation, depletion and amortization:
Depreciation, depletion and amortization	$ 237,088	$ 208,227	$ 682,948	$ 599,791
Expenditures for segment assets:
Expenditures for segment assets	793,879	582,697	1,606,854	1,823,712
Expenditures for property acquisitions			1,193,321	1,899,338
Operating Segments | EQT Production
Depreciation, depletion and amortization:
Depreciation, depletion and amortization	210,066	184,277	602,766	529,071
Expenditures for segment assets:
Expenditures for segment assets	621,377	451,358	1,090,033	1,453,647
Expenditures for property acquisitions	448,700	41,800	516,800	180,900
Operating Segments | EQT Midstream
Depreciation, depletion and amortization:
Depreciation, depletion and amortization	26,937	23,830	79,948	70,417
Expenditures for segment assets:
Expenditures for segment assets	171,645	130,902	513,776	368,019
Other
Depreciation, depletion and amortization:
Depreciation, depletion and amortization	85	120	234	303
Expenditures for segment assets:
Expenditures for segment assets	$ 857	$ 437	$ 3,045	$ 2,046