Financial Information by Business Segment - Schedule of Depreciation, Depletion, Amortization and Expenditures for Segment Assets (Details) - USD ($) $ in Thousands		12 Months Ended
	Nov. 13, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Depreciation, depletion and amortization:
Total		$ 1,077,559	$ 927,920	$ 819,216
Expenditures for segment assets:
Total		2,778,700	2,668,273	2,344,414
Payments to acquire PPE, non-cash portion		9,100	76,500	(89,600)
Payment for acquisition		818,957	1,051,239	0
Rice Merger Agreement
Expenditures for segment assets:
Payment for acquisition	$ 1,299,407
RMP Water and RMP Gathering | Rice Merger Agreement
Expenditures for segment assets:
Payment for acquisition		17,100
Operating Segments | EQT Production
Depreciation, depletion and amortization:
Total		982,103	859,018	765,298
Expenditures for segment assets:
Total		2,430,094	2,073,907	1,893,750
Non-cash capital expenditures		10,000	87,600
Measurement adjustments		(14,300)
Expenditures for property acquisitions		1,006,700	1,284,000	182,300
Operating Segments | EQM Gathering
Depreciation, depletion and amortization:
Total		38,796	30,422	24,360
Expenditures for segment assets:
Total		196,871	295,315	225,537
Operating Segments | EQM Transmission and Storage
Depreciation, depletion and amortization:
Total		58,689	32,269	25,535
Expenditures for segment assets:
Total		111,102	292,049	203,706
Amortization of deferred property taxes		10,500
Operating Segments | RMP Gathering
Depreciation, depletion and amortization:
Total		3,965	0	0
Expenditures for segment assets:
Total		28,320	0	0
Operating Segments | RMP Water
Depreciation, depletion and amortization:
Total		3,515	0	0
Expenditures for segment assets:
Total		6,233	0	0
Other
Depreciation, depletion and amortization:
Total		(9,509)	6,211	4,023
Expenditures for segment assets:
Total		$ 6,080	$ 7,002	$ 21,421