EQT GP Holdings, LP (Details) - USD ($) $ / shares in Units, $ in Thousands				1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 21, 2015	May. 15, 2015	Mar. 17, 2015	Apr. 30, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Class of Stock [Line Items]
Ownership contributed				100.00%
Ownership interest							30.20%
Proceeds from offerings, net of underwriters' discounts and structuring fees							$ 696,582	$ 902,451
Changes in ownership of EQT GP Holdings, LP							(191,250)
Increase to deferred tax liability							73,000
Net income attributable to noncontrolling interests					$ 58,211	$ 27,343	105,952	$ 46,085
Common Stock
Class of Stock [Line Items]
Changes in ownership of EQT GP Holdings, LP							322,008
Noncontrolling interests in consolidated subsidiaries
Class of Stock [Line Items]
Changes in ownership of EQT GP Holdings, LP							$ (513,258)
Limited Partner Common
Class of Stock [Line Items]
Number of common units					21,811,643		21,811,643
Ownership interest		90.10%
Number of common units issued to the public in an offering			1,237,500
Number of common units retained		239,715,000
General Partner
Class of Stock [Line Items]
Number of general partner units					1,443,015		1,443,015
General partner's interest							2.00%
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%
Proceeds from offerings, net of underwriters' discounts and structuring fees		$ 674,400
Increase to deferred tax liability		191,300
EQGP | Subsequent Event
Class of Stock [Line Items]
Cash distribution declared (in dollars per share)	$ 0.04739
Pro-rated distribution period	47 days
EQGP | Common Stock
Class of Stock [Line Items]
Changes in ownership of EQT GP Holdings, LP		322,000
EQGP | Noncontrolling interests in consolidated subsidiaries
Class of Stock [Line Items]
Changes in ownership of EQT GP Holdings, LP		$ 513,300
EQGP | Limited Partner Common
Class of Stock [Line Items]
Ownership interest		9.90%
Number of common units issued to the public in an offering		26,450,000
EQGP | General Partner
Class of Stock [Line Items]
General partner's interest				2.00%
EQGP | Affiliated Entity | Limited Partner Common
Class of Stock [Line Items]
Number of common units				21,811,643
Ownership interest				30.20%
EQGP | Affiliated Entity | General Partner
Class of Stock [Line Items]
Number of general partner units				1,443,015