Financial Information by Business Segment (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Operating segments information
Total assets	$ 11,385,936	$ 9,792,053
Operating segments
Operating segments information
Total assets	9,677,951	8,873,494
Operating segments | EQT Production
Operating segments information
Total assets	7,191,308	6,359,065
Operating segments | EQT Midstream
Operating segments information
Total assets	2,486,643	2,514,429
Headquarters
Operating segments information
Total assets	$ 1,707,985	$ 918,559