Equity in Nonconsolidated Investments (Details) (USD $)	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Equity in Nonconsolidated Investments
Equity in nonconsolidated investments	$ 128,983,000	$ 130,368,000
Equity in earnings of nonconsolidated investments	7,600,000	6,100,000	7,200,000
Summarized Balance Sheets
Current assets	27,014,000	15,966,000
Noncurrent assets	239,583,000	249,347,000
Total assets	266,597,000	265,313,000
Current liabilities	8,529,000	4,476,000
Stockholders' equity	258,068,000	260,837,000
Total liabilities and stockholders' equity	266,597,000	265,313,000
Summarized Statements of Income
Revenues	45,040,000	47,888,000	49,772,000
Operating expenses	29,810,000	35,596,000	35,520,000
Net income	15,230,000	12,292,000	14,252,000
Nora Gathering, LLC
Equity in Nonconsolidated Investments
Ownership percentage	50.00%
Equity in nonconsolidated investments	128,983,000	130,368,000
Nora Gathering, LLC \| EQT Midstream
Equity in Nonconsolidated Investments
Ownership percentage	50.00%
Additional equity investments made	$ 0	$ 0

This element represents the operating expenses of entities accounted for, under the equity method of accounting.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

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-Publisher FASB

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- Definition

The amount of assets reported by an equity method investment of the entity.

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Balance Type:	debit
Period Type:	instant

- Definition

The amount of current assets reported by an equity method investment of the entity.

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- Definition

The amount of current liabilities reported by an equity method investment of the entity.

+ References

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- Definition

Amount of equity, excluding noncontrolling interest, attributable to the equity method investment of the entity.

+ References

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- Definition

The amount of liabilities and equity reported by an equity method investment of the entity.

+ References

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- Definition

The amount of net income (loss) reported by an equity method investment of the entity.

+ References

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- Definition

The amount of noncurrent assets reported by an equity method investment of the entity.

+ References

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- Definition

The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity.

+ References

No definition available.

+ Details

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- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

+ References

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- Definition

The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

+ References

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