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Segment Information (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2010
Jun. 30, 2011
Operating segments information    
Total assets $ 7,098,438,000 $ 7,293,089,000
Total operating segments
    
Operating segments information    
Total assets 6,904,580,000 7,162,759,000
EQT Production
    
Operating segments information    
Total assets 3,979,676,000 4,520,399,000
Undeveloped property acquisition amount 230,700,000  
EQT Midstream
    
Operating segments information    
Total assets 2,076,485,000 1,854,299,000
Distribution
    
Operating segments information    
Total assets 848,419,000 788,061,000
Unallocated
    
Operating segments information    
Total assets $ 193,858,000 $ 130,330,000