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Financial Information by Business Segment - Schedule of Depreciation, Amortization, and Expenditures (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Depreciation, depletion and amortization:    
Depreciation, depletion and amortization $ 231,918 $ 221,231
Expenditures for segment assets:    
Expenditures for segment assets 1,017,313 373,546
Payments to acquire businesses, gross 669,479 0
Operating Segments | EQT Production    
Depreciation, depletion and amortization:    
Depreciation, depletion and amortization 211,097 205,676
Expenditures for segment assets:    
Expenditures for segment assets 945,458 237,566
Consideration transferred 45,300 33,300
Payments to acquire businesses, gross 669,500  
Capital expenditures incurred but not yet paid 15,400  
Operating Segments | EQT Gathering    
Depreciation, depletion and amortization:    
Depreciation, depletion and amortization 8,860 7,263
Expenditures for segment assets:    
Expenditures for segment assets 48,838 73,087
Operating Segments | EQT Transmission    
Depreciation, depletion and amortization:    
Depreciation, depletion and amortization 11,687 6,744
Expenditures for segment assets:    
Expenditures for segment assets 21,389 60,071
Other    
Depreciation, depletion and amortization:    
Depreciation, depletion and amortization 274 1,548
Expenditures for segment assets:    
Expenditures for segment assets $ 1,628 $ 2,822