Consolidating Financial Information - Statement of Cash Flows Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities
Net cash provided by (used in) operating activities	$ 297,781	$ (58,473)	$ (59,980)
Cash flows from investing activities
Capital expenditures for property and equipment funded by Parent	(138,987)	(129,308)	(90,504)
Net cash used in investing activities	(138,987)	(129,308)	(90,504)
Cash flows from financing activities
Proceeds from issuance of debt	3,700,000	0	0
Deferred financing costs	(77,163)	0	0
Repayment of bridge facilities	(4,544,850)	0	0
Repayment of debt principal	(16,750)	0	0
Proceeds from purchase of Operating Partnership units by MGP	1,132,468
Dividends and distributions paid	(150,829)	0	0
Cash received by Parent on behalf of Guarantor Subsidiaries	0
Net cash transfers from Parent	158,822	187,781	150,484
Net cash provided by financing activities	201,698	187,781	150,484
Cash and cash equivalents
Cash and Cash Equivalents, Period Increase (Decrease)	360,492	0	0
Cash and cash equivalents	360,492	0	0	$ 0
Eliminations
Cash flows from operating activities
Net cash provided by (used in) operating activities	0
Cash flows from investing activities
Capital expenditures for property and equipment funded by Parent	0
Net cash used in investing activities	0
Cash flows from financing activities
Proceeds from issuance of debt	0
Deferred financing costs	0
Repayment of bridge facilities	0
Repayment of debt principal	0
Proceeds from purchase of Operating Partnership units by MGP	0
Dividends and distributions paid	0
Cash received by Parent on behalf of Guarantor Subsidiaries	0
Net cash transfers from Parent	0
Net cash provided by financing activities	0
Cash and cash equivalents
Cash and Cash Equivalents, Period Increase (Decrease)	0
Cash and cash equivalents	0	0
MGP Operating Partnership
Cash flows from operating activities
Net cash provided by (used in) operating activities	297,781	(58,473)	(59,980)
Cash flows from investing activities
Capital expenditures for property and equipment funded by Parent	(138,987)	(129,308)	(90,504)
Net cash used in investing activities	(138,987)	(129,308)	(90,504)
Cash flows from financing activities
Proceeds from issuance of debt	3,700,000	0	0
Deferred financing costs	(77,163)	0	0
Repayment of bridge facilities	(4,544,850)	0	0
Repayment of debt principal	(16,750)	0	0
Proceeds from purchase of Operating Partnership units by MGP	1,132,468	0	0
Dividends and distributions paid	(150,829)	0	0
Net cash transfers from Parent	158,822	187,781	150,484
Net cash provided by financing activities	201,698	187,781	150,484
Cash and cash equivalents
Cash and Cash Equivalents, Period Increase (Decrease)	360,492	0	0
Cash and cash equivalents	360,492	0	$ 0	$ 0
MGP Operating Partnership | Reportable Legal Entities
Cash flows from operating activities
Net cash provided by (used in) operating activities	(99,884)
Cash flows from investing activities
Capital expenditures for property and equipment funded by Parent	0
Net cash used in investing activities	0
Cash flows from financing activities
Proceeds from issuance of debt	3,700,000
Deferred financing costs	(77,163)
Repayment of bridge facilities	(4,544,850)
Repayment of debt principal	(16,750)
Proceeds from purchase of Operating Partnership units by MGP	1,132,468
Dividends and distributions paid	(150,829)
Cash received by Parent on behalf of Guarantor Subsidiaries	417,500
Net cash transfers from Parent	0
Net cash provided by financing activities	460,376
Cash and cash equivalents
Cash and Cash Equivalents, Period Increase (Decrease)	360,492
Cash and cash equivalents	360,492	0
Co-Issuer | Reportable Legal Entities
Cash flows from operating activities
Net cash provided by (used in) operating activities	0
Cash flows from investing activities
Capital expenditures for property and equipment funded by Parent	0
Net cash used in investing activities	0
Cash flows from financing activities
Proceeds from issuance of debt	0
Deferred financing costs	0
Repayment of bridge facilities	0
Repayment of debt principal	0
Proceeds from purchase of Operating Partnership units by MGP	0
Dividends and distributions paid	0
Cash received by Parent on behalf of Guarantor Subsidiaries	0
Net cash transfers from Parent	0
Net cash provided by financing activities	0
Cash and cash equivalents
Cash and Cash Equivalents, Period Increase (Decrease)	0
Cash and cash equivalents	0	0
Guarantor Subsidiaries | Reportable Legal Entities
Cash flows from operating activities
Net cash provided by (used in) operating activities	397,665
Cash flows from investing activities
Capital expenditures for property and equipment funded by Parent	(138,987)
Net cash used in investing activities	(138,987)
Cash flows from financing activities
Proceeds from issuance of debt	0
Deferred financing costs	0
Repayment of bridge facilities	0
Repayment of debt principal	0
Proceeds from purchase of Operating Partnership units by MGP	0
Dividends and distributions paid	0
Cash received by Parent on behalf of Guarantor Subsidiaries	(417,500)
Net cash transfers from Parent	158,822
Net cash provided by financing activities	(258,678)
Cash and cash equivalents
Cash and Cash Equivalents, Period Increase (Decrease)	0
Cash and cash equivalents	$ 0	$ 0