Financial Information by Business Segment - Schedule of Segment Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment assets:
Assets	$ 15,472,922	$ 13,976,172	$ 12,035,353
Operating Segments
Segment assets:
Assets	13,548,711	12,093,865	10,803,873
Operating Segments | EQT Production
Segment assets:
Assets	10,923,824	9,905,344	9,056,501
Operating Segments | EQT Gathering
Segment assets:
Assets	1,225,686	1,019,004	819,254
Operating Segments | EQT Transmission and Storage
Segment assets:
Assets	1,399,201	1,169,517	928,118
Headquarters Assets, Including Cash and Short-Term Investments
Segment assets:
Assets	$ 1,924,211	$ 1,882,307	$ 1,231,480