EQT GP Holdings, LP (Details) - USD ($) $ / shares in Units, $ in Thousands					1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 20, 2015	May. 15, 2015	Mar. 18, 2015	Mar. 17, 2015	Jan. 31, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Class of Stock [Line Items]
Ownership contributed (as a percent)					100.00%
General partner's interest (as a percent)						2.00%
Proceeds from offerings								$ 758,812	$ 902,467
Increase to deferred tax liability				$ 73,000		$ 5,400
Net income attributable to noncontrolling interests						$ 59,446	$ 33,739	$ 165,398	$ 79,824
Limited Partner Common
Class of Stock [Line Items]
Ownership interest (as a percent)		90.10%
Number of common units issued to the public in an offering (in shares)			1,237,500
Number of common units retained		239,715,000
General partner common
Class of Stock [Line Items]
Threshold for incentive distribution								$ 0.5250
EQGP
Class of Stock [Line Items]
Percent of incremental cash distributed						48.00%		48.00%
Proceeds from offerings		$ 674,000
Increase to deferred tax liability		191,100
EQGP | Subsequent Event
Class of Stock [Line Items]
Cash distribution declared (in dollars per share)	$ 0.104
Distribution made to limited partner, cash distributions declared	$ 27,700
EQGP | Common Stock
Class of Stock [Line Items]
Increase (decrease) in ownership of EQT GP Holdings, LP		321,800
EQGP | Noncontrolling interests in consolidated subsidiaries
Class of Stock [Line Items]
Increase (decrease) in ownership of EQT GP Holdings, LP		$ (512,900)
EQGP | Limited Partner Common
Class of Stock [Line Items]
Ownership interest (as a percent)		9.90%
Number of common units issued to the public in an offering (in shares)		26,450,000
Underwriters discount and structuring fees		$ 2,600
EQGP | General Partner
Class of Stock [Line Items]
General partner's interest (as a percent)								1.98%
EQGP | Affiliated entity | Limited Partner Common
Class of Stock [Line Items]
Number of common units						21,811,643		21,811,643
Ownership interest (as a percent)								29.89%
EQGP | Affiliated entity | General Partner
Class of Stock [Line Items]
Number of general partner units						1,443,015		1,443,015