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EQT GP Holdings, LP (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jul. 25, 2017
Jun. 30, 2017
General Partner Common    
Class of Stock [Line Items]    
Incentive distribution rights distributed in respect of each common unit and general partner unit (in dollars per share)   $ 0.5250
EQGP    
Class of Stock [Line Items]    
Percentage of all incremental cash distributed (up to)   48.00%
EQGP | Subsequent Event    
Class of Stock [Line Items]    
Cash distribution declared (in dollars per share) $ 0.21  
Cash distribution declared $ 55.9  
EQGP | General Partner    
Class of Stock [Line Items]    
General partner interest (as a percent)   1.80%
EQGP | Affiliated Entity | Limited Partner Common    
Class of Stock [Line Items]    
Number of common units (in shares)   21,811,643
Limited partner interest (as a percent)   26.60%
EQGP | Affiliated Entity | General Partner    
Class of Stock [Line Items]    
Number of general partner units (in shares)   1,443,015