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Divestitures - Additional Information (Details)
$ in Thousands, a in Millions
 3 Months Ended 9 Months Ended
Jul. 18, 2018
USD ($)
MMcfe
mi
well
a
compressor_station
Jun. 19, 2018
USD ($)
MMcfe
mi
well
compressor_station
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from sale of productive assets   $ 57,700            
Number of wells sold | well   970            
Reduction in sales volume | MMcfe   20            
Number of miles of gathering lines sold | mi   350            
Number of compressors sold | compressor_station   26            
Impairment of long-lived assets     $ 259,300   $ 2,300,000      
Oil and gas asset         $ 1,000,000      
Gain (loss) on disposal and impairment     $ (259,279) $ (118,100)   $ 0 $ (2,706,438) $ 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from sale of productive assets $ 523,600              
Number of wells sold | well 12,000              
Reduction in sales volume | MMcfe 200              
Number of miles of gathering lines sold | mi 6,400              
Number of compressors sold | compressor_station 59              
Number of acres sold | a 2.5