Common Stock and Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Basic earnings per common share:
Net (loss) income attributable to EQT Corporation									$ (452,983)	$ 85,171	$ 386,965
Average common stock outstanding (in shares)									166,978,000	152,398,000	151,553,000
Basic earnings per common share (in dollars per share)	$ (1.11)	$ (0.05)	$ (1.55)	$ 0.04	$ (0.88)	$ 0.27	$ 0.04	$ 1.14	$ (2.71)	$ 0.56	$ 2.55
Diluted earnings per common share:
Net (loss) income attributable to EQT Corporation									$ (452,983)	$ 85,171	$ 386,965
Stock options and awards (in shares)									0	541,000	960,000
Total (in shares)									166,978,000	152,939,000	152,513,000
Diluted earnings per common share (in dollars per share)	$ (1.11)	$ (0.05)	$ (1.55)	$ 0.04	$ (0.88)	$ 0.27	$ 0.04	$ 1.14	$ (2.71)	$ 0.56	$ 2.54
Anti-dilutive securities (in shares)										291,700	0