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Equity Method Investments - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2013
May. 31, 2007
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2006
Dec. 31, 2015
Jun. 16, 2014
Schedule Of Equity Method Investments [Line Items]                
Income (Loss) from equity method investments       $ (3,095) $ 2,973      
Whipstock Natural Gas Services LLC                
Schedule Of Equity Method Investments [Line Items]                
Percentage ownership interest         50.00% 50.00%    
Cash contributed for investment           $ 11,700    
Proceeds from sale of equity method investments $ 7,000              
Equity method investment, Realized gain (loss) on disposal $ 4,400              
Nora Gathering, LLC                
Schedule Of Equity Method Investments [Line Items]                
Percentage ownership interest             50.00%  
Cash contributed for investment   $ 94,700            
Income (Loss) from equity method investments     $ (277)   $ (146)      
Reduction in equity to eliminate the profit from gathering and transportation fees     $ 3,100   7,700      
Cash distribution from investment       $ 7,000 $ 9,000      
EQT Corporation                
Schedule Of Equity Method Investments [Line Items]                
Equity method investment remaining ownership percentage               50.00%