Financial Information by Business Segment (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Operating segments information
Total assets	$ 10,246,306	$ 9,792,053
Operating segments
Operating segments information
Total assets	9,239,149	8,873,494
Operating segments | EQT Production
Operating segments information
Total assets	6,706,590	6,359,065
Operating segments | EQT Midstream
Operating segments information
Total assets	2,532,559	2,514,429
Headquarters
Operating segments information
Total assets	$ 1,007,157	$ 918,559