Financial Information by Business Segment - Schedule of Depreciation, Depletion, Amortization and Expenditures for Segment Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Depreciation, depletion and amortization:
Total	$ 819,216	$ 679,298	$ 653,132
Expenditures for segment assets:
Total	2,344,414	2,900,186	1,796,876
Total operating segments | EQT Production
Depreciation, depletion and amortization:
Total	723,448	592,855	578,641
Expenditures for segment assets:
Total	1,852,100	2,441,486	1,423,185
Total operating segments | EQT Midstream
Depreciation, depletion and amortization:
Total	95,280	87,034	75,032
Expenditures for segment assets:
Total	486,809	455,359	369,399
Other
Depreciation, depletion and amortization:
Total	488	(591)	(541)
Expenditures for segment assets:
Total	$ 5,505	$ 3,341	$ 4,292