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Consolidated Variable Interest Entities - Statements of Operations and Cash Flows (Details) - EQGP - Variable Interest Entity, Primary Beneficiary - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Variable Interest Entity [Line Items]
Operating revenues	$ 364,584	$ 207,193	$ 1,110,307	$ 609,585
Operating expenses	133,665	62,230	370,880	180,218
Other (income) expenses	23,534	2,556	37,632	6,418
Net income	207,385	142,407	701,795	422,949
Net cash provided by operating activities	422,938	159,911	863,009	479,566
Net cash used in investing activities	(575,624)	(117,637)	(2,252,293)	(324,936)
Net cash (used in) provided by financing activities	$ (536,246)	$ (48,128)	$ 1,340,446	$ (208,150)

X

- Definition

Variable Interest Entity, Measure of Activity, Income or Loss, Net of Tax

+ References

No definition available.

+ Details

Name:	eqt_VariableInterestEntityMeasureofActivityIncomeorLossNetofTax
Namespace Prefix:	eqt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Variable Interest Entity, Measure of Activity, Net Cash Provided by (Used in) Financing Activities

+ References

No definition available.

+ Details

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Namespace Prefix:	eqt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Variable Interest Entity, Measure of Activity, Net Cash Provided by (Used in) Investing Activities

+ References

No definition available.

+ Details

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Namespace Prefix:	eqt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Variable Interest Entity, Measure of Activity, Net Cash Provided by (Used in) Operating Activities

+ References

No definition available.

+ Details

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Namespace Prefix:	eqt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Variable Interest Entity, Measure of Activity, Other Expenses (Income)

+ References

No definition available.

+ Details

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Namespace Prefix:	eqt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of expense between the reporting entity and the Variable Interest Entity (VIE).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph d
-URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5747-111685

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of income between the reporting entity and the Variable Interest Entity (VIE).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph d
-URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5747-111685

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=eqt_EQTGPHoldingsLPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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