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Changes in Accumulated Other Comprehensive Income by Component (Tables) | 6 Months Ended
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Jun. 30, 2015
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of the changes in accumulated OCI by component | The following tables explain the changes in accumulated OCI by component during the applicable period:
| Three Months Ended June 30, 2015
| Natural gas cash flow hedges, net of tax |  | Interest rate cash flow hedges, net of tax |  | Pension and other post- retirement benefits liability adjustment, net of tax |  | Accumulated OCI, net of tax
| (Thousands)
Accumulated OCI (loss), net of tax, as of April 1, 2015 | $ | 176,370 |  |  | $ | (951 | ) |  | $ | (16,438 | ) |  | $ | 158,981 |
(Gains) losses reclassified from accumulated OCI, net of tax | (42,581 | ) | (a) | 36 |  | (a) | 202 |  | (b) | (42,343 | )
Accumulated OCI (loss), net of tax, as of June 30, 2015 | $ | 133,789 |  |  | $ | (915 | ) |  | $ | (16,236 | ) |  | $ | 116,638 |
| Three Months Ended June 30, 2014
| Natural gas cash flow hedges, net of tax |  | Interest rate cash flow hedges, net of tax |  | Pension and other post- retirement benefits liability adjustment, net of tax |  | Accumulated OCI, net of tax
| (Thousands)
Accumulated OCI (loss), net of tax, as of April 1, 2014 | $ | 39,768 |  |  | $ | (1,096 | ) |  | $ | (15,688 | ) |  | $ | 22,984 |
Losses recognized in accumulated OCI, net of tax | (13,455 | ) | (a) | — |  |  | — |  |  | (13,455 | )
Gain reclassified from accumulated OCI, net of tax, into gain on sale / exchange of assets | (16,735 | ) | (a) | — |  |  | — |  |  | (16,735 | )
Losses reclassified from accumulated OCI, net of tax | 10,883 |  | (a) | 36 |  | (a) | 176 |  | (b) | 11,095 |
Change in accumulated OCI (loss), net of tax | (19,307 | ) |  | 36 |  |  | 176 |  |  | (19,095 | )
Accumulated OCI (loss), net of tax, as of June 30, 2014 | $ | 20,461 |  |  | $ | (1,060 | ) |  | $ | (15,512 | ) |  | $ | 3,889 |
| Six Months Ended June 30, 2015
| Natural gas cash flow hedges, net of tax |  | Interest rate cash flow hedges, net of tax |  | Pension and other post- retirement benefits liability adjustment, net of tax |  | Accumulated OCI (loss), net of tax
| (Thousands)
Accumulated OCI (loss), net of tax, as of January 1, 2015 | $ | 217,121 |  |  | $ | (987 | ) |  | $ | (16,640 | ) |  | $ | 199,494 |
(Gains) losses reclassified from accumulated OCI, net of tax | (83,332 | ) | (a) | 72 |  | (a) | 404 |  | (b) | (82,856 | )
Accumulated OCI (loss), net of tax, as of June 30, 2015 | $ | 133,789 |  |  | $ | (915 | ) |  | $ | (16,236 | ) |  | $ | 116,638 |
| Six Months Ended June 30, 2014
| Natural gas cash flow hedges, net of tax |  | Interest rate cash flow hedges, net of tax |  | Pension and other post- retirement benefits liability adjustment, net of tax |  | Accumulated OCI (loss), net of tax
| (Thousands)
Accumulated OCI (loss), net of tax, as of January 1, 2014 | $ | 61,699 |  |  | $ | (1,132 | ) |  | $ | (15,864 | ) |  | $ | 44,703 |
Losses recognized in accumulated OCI, net of tax | (52,649 | ) | (a) | — |  |  | — |  |  | (52,649 | )
Gain reclassified from accumulated OCI, net of tax, into gain on sale / exchange of assets | (16,735 | ) | (a) | — |  |  | — |  |  | (16,735 | )
Losses reclassified from accumulated OCI, net of tax | 28,146 |  | (a) | 72 |  | (a) | 352 |  | (b) | 28,570 |
Change in accumulated OCI (loss), net of tax | (41,238 | ) |  | 72 |  |  | 352 |  |  | (40,814 | )
Accumulated OCI (loss), net of tax, as of June 30, 2014 | $ | 20,461 |  |  | $ | (1,060 | ) |  | $ | (15,512 | ) |  | $ | 3,889 |
(a) See Note F for additional information. (b) This accumulated OCI reclassification is attributable to the net actuarial loss and net prior service cost related to the Company’s defined benefit pension plans and other post-retirement benefit plans. See Note 13 to the Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014 for additional information.

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- Definition Tabular disclosure of the changes in accumulated other comprehensive income (loss) by component. + References No definition available. + Details
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Namespace Prefix: | eqt_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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