Revolving Credit Facilities (Details)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Revolving Credit Facilities
Commitment fee paid to maintain credit facility (as a percent)	0.05%	0.075%
Commitment fee paid by partner to maintain credit facility (as a percent)	0.0625%

Represents the fee incurred by partner, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

No definition available.

Name:	eqt_LineOfCreditFacilityCommitmentFeePercentageIncurredByPartner
Namespace Prefix:	eqt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration