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Segment Information (Details) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
May 31, 2011
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Operating segments information            
Number of segments       3    
Revenues from external customers   $ 349,000,000 $ 257,515,000 $ 804,671,000 $ 694,155,000  
Operating income   153,170,000 78,529,000 350,797,000 247,642,000  
Reconciliation of operating income to net income:            
Gain on disposition       22,785,000    
Other income   18,046,000 2,573,000 24,850,000 5,627,000  
Interest expense   33,287,000 34,080,000 66,139,000 68,214,000  
Income taxes   50,175,000 17,022,000 122,284,000 66,990,000  
Net income   87,754,000 30,000,000 210,009,000 118,065,000  
Depreciation, depletion and amortization   81,886,000 65,217,000 160,284,000 127,096,000  
Capital expenditures   374,098,000 536,020,000 637,526,000 753,547,000  
EQT Production
            
Operating segments information            
Revenues from external customers   196,810,000 119,028,000 369,852,000 263,391,000  
Operating income   99,759,000 41,029,000 182,088,000 114,146,000  
Reconciliation of operating income to net income:            
Depreciation, depletion and amortization   61,899,000 43,468,000 119,733,000 84,378,000  
Capital expenditures   317,906,000 483,656,000 544,878,000 662,071,000  
Expenditures for segment assets for the liabilities assumed 92,600,000          
Expenditures for segment assets for undeveloped property acquisitions           230,700,000
EQT Midstream
            
Operating segments information            
Revenues from external customers   131,201,000 136,995,000 272,863,000 291,591,000  
Operating income   52,243,000 41,714,000 118,876,000 94,405,000  
Reconciliation of operating income to net income:            
Depreciation, depletion and amortization   14,296,000 15,611,000 29,004,000 30,535,000  
Capital expenditures   46,500,000 44,293,000 75,605,000 78,980,000  
Distribution
            
Operating segments information            
Revenues from external customers   69,100,000 63,349,000 264,191,000 285,604,000  
Operating income   8,928,000 4,290,000 62,295,000 51,709,000  
Reconciliation of operating income to net income:            
Depreciation, depletion and amortization   5,923,000 6,016,000 11,880,000 12,010,000  
Capital expenditures   8,811,000 7,750,000 15,030,000 11,725,000  
Other
            
Reconciliation of operating income to net income:            
Depreciation, depletion and amortization   (232,000) 122,000 (333,000) 173,000  
Capital expenditures   881,000 321,000 2,013,000 771,000  
Unallocated
            
Operating segments information            
Operating income   (7,760,000) (8,504,000) (12,462,000) (12,618,000)  
Eliminations
            
Operating segments information            
Revenues from external customers   $ (48,111,000) $ (61,857,000) $ (102,235,000) $ (146,431,000)