Segment Information (Details 2) (USD $)	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Operating segments information
Total assets	$ 8,748,171,000	$ 8,772,719,000
Reportable Segments
Operating segments information
Total assets	8,183,106,000	7,892,148,000
EQT Production
Operating segments information
Total assets	5,469,398,000	5,256,645,000
Expenditure on segment assets for the acquisition of producing properties			92,600,000
EQT Midstream
Operating segments information
Total assets	1,918,025,000	1,785,089,000
Distribution
Operating segments information
Total assets	795,683,000	850,414,000
Unallocated expenses
Operating segments information
Total assets	$ 565,065,000	$ 880,571,000