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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 |  |  |  |

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