Net Income Per Operating Patnership Unit (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								4 Months Ended	8 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	Apr. 24, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Numerator:
Net income	$ 50,999	$ 42,671	$ 9,646	$ (67,970)	$ (70,888)	$ (68,775)	$ (61,538)	$ (60,753)	$ (84,383)	$ 119,729	$ 35,346	$ (261,954)	$ (246,242)
Numerator:
Net income	50,999	42,671	9,646	(67,970)	(70,888)	(68,775)	(61,538)	(60,753)	(84,383)	$ 119,729	35,346	(261,954)	(246,242)
Denominator:
Effect of dilutive shares for diluted net income per Operating Partnership unit (in units)										249,331
MGP Operating Partnership
Numerator:
Net income	$ 50,999	$ 42,671	$ 9,646	(67,970)	(70,888)	(68,775)	(61,538)	(60,753)	(84,383)	$ 119,729	$ 35,346	(261,954)	(246,242)
Denominator:
Basic weighted average Operating Partnership units outstanding (in units)										232,181,070
Basic net income per Operating Partnership Unit (in usd per unit)	$ 0.21	$ 0.18	$ 0.12							$ 0.52	$ 0.52
Numerator:
Net income	$ 50,999	$ 42,671	$ 9,646	$ (67,970)	$ (70,888)	$ (68,775)	$ (61,538)	$ (60,753)	$ (84,383)	$ 119,729	$ 35,346	$ (261,954)	$ (246,242)
Denominator:
Basic weighted average Operating Partnership units outstanding (in units)										232,181,070
Effect of dilutive shares for diluted net income per Operating Partnership unit (in units)										249,331
Weighted average shares for diluted net income per Operating Partnership unit (in units)										232,430,401
Diluted net income per Operating Partnership unit (in usd per unit)	$ 0.21	$ 0.18	$ 0.12								$ 0.52