Operating Partnership Selected Quarterly Financial Results (Unaudited) - Summary of Quarterly Financial Results (Details) - USD ($) $ / shares in Units, $ 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
Segment Reporting Information [Line Items]
Revenues	$ 184,146	$ 172,499	$ 110,903	$ 0	$ 0	$ 0	$ 0	$ 0			$ 467,548	$ 0	$ 0
Operating income (loss)	95,759	86,792	39,193	(67,970)	(70,888)	(68,775)	(61,538)	(60,753)			153,774	(261,954)	(246,242)
Net income (loss)	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)
MGP Operating Partnership
Segment Reporting Information [Line Items]
Revenues	184,146	172,499	110,903	0	0	0	0	0			467,548	0	0
Operating income (loss)	95,759	86,792	39,193	(67,970)	(70,888)	(68,775)	(61,538)	(60,753)			153,774	(261,954)	(246,242)
Net income (loss)	$ 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)
Net income per Operating Partnership unit, basic (in usd per unit)	$ 0.21	$ 0.18	$ 0.12							$ 0.52	$ 0.52
Net income per Operating Partnership unit, diluted (in usd per unit)	$ 0.21	$ 0.18	$ 0.12								$ 0.52